Handheld Optical Power and Energy Meter Console with Multi-Touch Technology

Overview
Specs
Display
Pin Diagrams
Shipping List
Software
Sensor Selection
Feedback
Console Selection

PM400 Power Meter Console^a
Compatible Sensors	Photodiode, Thermal Power, Thermal Position & Power, and Pyroelectric Energy
Optical Power Range^b	100 pW to 200 W
Optical Energy Range^b	3 µJ to 15 J
Available Sensor Wavelength Range^b	185 nm - 25 μm
Display Refresh Rate	10 Hz (Numerical) 25 Hz (Analog Simulation)
Bandwidth^b	DC - 100 kHz

See the Specs tab for complete console specifications.
Sensor Dependent

Features

Compact Digital Power Meter Console
For CW and Pulsed Source Detection
Inputs for Temperature and Humidity Sensors
Save and Apply User-Provided Spectral Calibration and Attenuation Correction Files
Touchscreen Display with Multi-Touch Technology
USB 2.0 Interface for Remote Control, Data Transfer, and Charging
Long-Life Internal Li-Polymer Battery
Up to 10 Hours of Battery-Powered Operation between Charging
Compatible with TSP-TH Temperature Probe
Sensor Upgrade and Recalibration Services Available
Optical Power Monitor PC Software Available (See Software Tab for Details)

The PM400 console is designed to be used with Thorlabs' power, position & power, and energy sensors to measure the optical power of laser light, other monochromatic, or near monochromatic light sources, or the energy of pulsed light sources. The projected capacitive touchscreen uses multi-touch technology, allowing data displays to be zoomed and scrolled with hand gestures. Capacitive touch buttons on the front of the unit enable fast access to set the source wavelength or spectrum, a delta mode that shows the change in power from a user-selected set point, the zeroing function, and device main menu. The touchscreen is sensitive enough that it can be operated while wearing latex, nitrile, or cotton gloves. The screen is also backlit and can be dimmed to 1% of the maximum brightness.

Click to Enlarge
The PM400 features a variety of input ports for compatible optical sensors and temperature sensors, as well as a 14-pin auxiliary input for custom applications.

In the simplest operating mode, power and energy measurements can be viewed with a simulated analog needle or numerical display. Alternatively, data can be logged over time and saved to the device's internal memory. A graph display allows the user to examine and analyze the results with multi-touch enabled zoom and scrolling features, while a statistics display allows the user to program and analyze a sequence of measurements. In addition to pre-programming source wavelengths or spectra for calibrating their measurements, users can also enter and save up to twelve attenuation values or data files to correct for effects that external devices (such as filters or beamsplitters) may have on the power measurement. Measured data, calibration information, and attenuation curves can all be saved to the unit's internal 4 GB flash memory. The user can modify and copy the files saved to internal memory by connecting the unit to a PC via the USB port.

The PM400 is compatible with more than 35 photodiode, integrating sphere, fiber, thermal, and pyroelectric sensors designed for use from the UV to the Mid-IR, available below. The Sensor Selection tab offers a comparison of the operating wavelengths and power or energy ranges for each sensor. Thorlabs' compatible C-series sensors can be hot-swapped when used with the PM400 console. The sensor connector contains the sensor information, including NIST-traceable responsivity curves, sensor types, and model numbers, which the PM400 uses to produce calibrated power measurements. These details can be shown on the sensor information display screen of the PM400. Alternatively, the console can be connected to compatible third-party and custom sensors via either the female DB9 connector or the 14-pin auxiliary input (see the Specs and Pin Diagrams tab for sensor compatibility information).

Power Meter Selection Guide
Sensors
Photodiode Power Sensors
Thermal Power Sensors
Thermal Position & Power Sensors
Pyroelectric Energy Sensors
Power Meter Consoles
Digital Handheld Console
Analog Handheld Console
Touchscreen Handheld Console
Dual-Channel Benchtop Console
Complete Power Meters
Power Meter Bundles
Wireless Power Meters with Sensors
Compact USB Power Meters
Field Power Meters for Terminated Fibers
USB Interfaces, External Readout

An external humidity sensor or combined humidity/temperature sensor unit can be connected via the 14-pin auxiliary input (see the Pin Diagrams tab). This input also provides access to the four programmable I/O ports for controlling shutters, interlock devices, laser warning lights, and other common lab devices. Alternatively, a 2.5 mm stereo (3P) jack accepts the TSP-TH thermistor temperature probe, as shown in the image below.

A 3.5 mm mono audio (2P) jack provides a 0 to 2 V analog signal that corresponds to the ratio of the measured value to the full scale value; a BNC adapter for this jack is included so that the output can be easily viewed using an oscilloscope or other device.

Data can also be recorded via the USB PC connection and optical power monitor software. This software is capable of handling up to eight consoles simultaneously. The features of the PC control software are highlighted in the Software tab.

As the PM400 uses a projected capacitive touchscreen, the outer surface is glass that can be easily cleaned with any common screen cleaning fluid.

To view the full range of Thorlabs' power and energy meter consoles, please refer to the Console Selection tab.

Sensor Upgrade Service
Thorlabs' current line of C-Series sensors and power meter consoles are not compatible with old power meter consoles and sensor heads, respectively. We offer a sensor upgrade service if you want to use your existing sensors with a new power meter console. Note: upgraded sensors will be incompatible with old power meter consoles and new sensors converted to work with older consoles will not be compatible with the PM400. Please contact our Tech Support team for details.

Recalibration Service
Recalibration services are available for our power sensors, energy sensors, and consoles. We recommend that your Thorlabs sensor and console be recalibrated as a pair; however, each may be recalibrated individually. To order this service for your sensor or combined sensor and console, scroll to the bottom of the page and select the appropriate recalibration Item # that corresponds to your sensor. To order this service for only your console, please contact Tech Support.

Specifications
Compatible Detectors	Thorlabs' C-Series Photodiode, Thermal Power, Thermal Position & Power, and Pyroelectric Sensors Photodiodes up to 5 mA, Thermopiles up to 1 V, Pyroelectric Detectors up to 100 V, and Thermal Position & Power Sensors (Item #'s S440C and S442C) See Table Below for Additional Details
Display
Type	4.3" TFT, WQVGA, 400 x 272 Pixels, 16 Bit Color
Viewing Area	95 mm x 54 mm
Update Rate (Max)	10 Hz Numerical, 25 Hz Analog Simulation
Format	Numerical, Bar Graph, Trend Graph, Statistics, and Simulated Analog Needle
Backlight	LED, Adjustable
Features	Projected Capacitive Touchscreen and Buttons, Support Stand, Rubberized Outside, 2 x M3 Threaded Inserts for Mounting on Back Side
Analog Output
Connector	3.5 mm Mono Audio (2P) Jack, Adapter to BNC Included
Signal	Amplified Input Signal - Not Corrected
Voltage Range	0 to 2 V
Accuracy	±3%
Bandwidth	Up to 100 kHz, Dependent on Sensor and Settings
Auxiliary Input/Output
Connector	2 x 7 Pins, 0.1" Socket, Top Side
Function	4 x GPIO 2 x 10 bit ADC for External Temperature, Relative Humidity Sensor +3.3 V, +/- 2.5 V (100 mA Max)
Temperature Sensor Internal to C-Series Optical Sensor^a
Temperature Sensor Type	Thermistor
Temperature Measurement Range	-10 °C to 80 °C
External Temperature Sensor
Supported Temperature Sensor	Thermistor NTC 0.1 - 100 kΩ, B-Value 1000 - 9999 K
Temperature Measurement Range	-10 °C to 80 °C (with TSP-TH)
Connector	2.5 mm Stereo Audio (3P) Jack
Sound
Type	Internal Speaker
Function	Laser Tuning Support, Console Function Support
Memory
Type	NAND Flash
Size	4 GB
Interfaces
Type	USB 2.0
Connector	Mini-B USB
Power Management
Battery	LiPo 3.7 V 2600 mAh
Charger	Built In; Charging Current: 0.5 / 1 A
Power Connector	Mini USB
General
Operating Temperature Range^b	0 to 40 °C
Storage Temperature Range	-40 to 70 °C
Dimensions	136 mm x 96 mm x 29 mm
Weight	0.35 kg

Many of Thorlabs' compatible C-Series optical power and energy sensors have a built-in temperature sensor.
Non-Condensing

Sensor Compatibility
Sensor Type	Photodiode Power Sensors	Thermal Power Sensors Thermal Position & Power Sensors	Pyroelectric Energy Sensors
Input Type	Current	Voltage	Voltage
Connector (on PM400)	Female DB9
Units	W, dBm, W/cm², A	W, dBm, W/cm², V	J, J/cm², W, W/cm², V
Measurement Ranges	6 Decades; 50 nA, 500 nA, 5 µA, 50 µA, 500 µA, 5 mA Ranges Selectable in W (Sensor Dependent)	9 Ranges: 2, 4, 10, 20, 40, 100, 200, 400, 1000 mV Ranges Selectable in W (Sensor Dependent)	4 Ranges: 200 mV, 2V, 20 V, 100 V Ranges Selectable in J (Sensor Dependent)
Display Resolution	1 pA / Responsivity Value (A/W)	1 μV / Responsivity Value (V/W)	100 μV / Responsivity Value (V/J)
AD Converter	16 bit
Accuracy	±0.2% Full Scale (5 μA - 5 mA) ±0.5% Full Scale (50 nA)	±0.5% Full Scale (10 mV - 1 V) ±1% Full Scale (2 mV)	±0.5% Full Scale
Bandwidth	DC - 100 kHz, Dependent on Sensor and Settings		N/A
Trigger Threshold	N/A	N/A	3% - 90% Full Scale
Time Constant Correction Range	N/A	1 s - 30 s	N/A
Repetition Rate (Max)	N/A	N/A	3 kHz
Wavelength Correction	nm, A/W (Sensor Dependent)	nm, V/W (Sensor Dependent)	nm, V/J (Sensor Dependent)
Beam Area Setting	Diameter 1/e² or Rectangular XY

All technical data are valid at 23 ± 5 °C and 45 ± 15% relative humidity (non-condensing).

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The Front Panel of the Touchscreen Power Meter

Touchscreen Power Meter Front Panel

Thorlabs' PM400 Power Meter features a front panel with several key elements, as shown in the photo to the right. The projected capacitive touchscreen and buttons are sensitive enough to allow smooth operation even when the user wears cotton, latex, or nitrile gloves, but durable enough to be cleaned with standard screen cleaning solvents.

Capacitive Touchscreen: The capacitive touchscreen allows the user to control the console functions with finger taps and swipes. Features include numerical displays of power and energy measurements, logging of long-term measurements, settings for a calibration wavelength or a preset attenuation value, and temperature monitoring. The user can switch measurement views by swiping one finger over the screen to the left or right, or by tapping the window icon in the lower right corner of the screen. More details on the measurement options are provided below.
Spectral Correction Button: This button opens a screen where the user can quickly select or save up to 12 measurement wavelengths. The PM400 will use this wavelength setting in conjunction with the calibration data recorded in the connector of Thorlabs' power and energy sensors in order to provide a calibrated optical power or energy reading. The selected wavelength is displayed above the button.
Delta Mode: In delta mode, the power meter will display the power or energy relative to a user selected setpoint. Pressing this button saves the current power or energy reading as the reference value, and subsequent measurements will be displayed as the difference between the actual value and the reference. The reference value is displayed above this button when Delta Mode is active.
Zeroing: Quickly set the current power or energy value as the zero point for subsequent measurements. The measured power or energy when the console is zeroed will be displayed above the Zero button.
Main Menu: This button provides quick access to the main menu. From here, the user can access a submenu to set the parameters for long-term power measurements, device settings, the file manager, sensor info, and the laser calculator. Details are provided below.

Additional Features
In addition to allowing users to select different measurement modes and settings, the PM400 incorporates other features to allow users to customize the interface.

Language Settings: English, French, German, and Chinese can be selected.
Display Brightness and Contrast: The power meter screen is backlit and can be dimmed to 1% of the maximum brightness. In addition, the user can choose whether to have the display show white text on a black background, or black text on a white background.
Laser Tuning Sound: The power meter plays an audible tone to aid in identifying when peak power is achieved while tuning a laser. The console will beep repeatedly, with the frequency of the beep increasing as the measured power increases.
Programmable I/O Ports: The PM400 features four programmable I/O ports for controlling shutters, interlocks, laser warning lights, etc.

The Touchscreen Display

The screenshots below provide an overview of some of the measurement views, measurement settings, functions, and calculators accessible through the touchscreen display.

Numerical Display

Subpanel Display Options
Photodiode Power Sensors	Thermal Power Sensors	Thermal Position & Power Sensors	Pyroelectric Energy Sensors
Current (I_DET)	Voltage (V_DET)	Voltage (V_DET)	Voltage (V_DET)
Power (Φ_e)	Power (Φ_e)	Power (Φ_e)	Energy (W_DET)
Power in dBm (Φ_e)	Power in dBm (Φ_e)	Power in dBm (Φ_e)	N/A
Max	Max	Max	Max
Min	Min	Min	Min
Ratio (Max/Min)	Ratio (Max/Min)	Ratio (Max/Min)	Ratio (Max/Min)
Sensor Temperature^a	Sensor Temperature^a	Sensor Temperature^a	N/A
Frequency	Frequency	Frequency	Frequency
External NTC Temperature	External NTC Temperature	External NTC Temperature	External NTC Temperature
Irradiance (E_e)	Irradiance (E_e)	Irradiance (E_e)	Fluence (H_e)
N/A	N/A	XY Position	N/A

Many, but not all, of Thorlabs' compatible optical power sensors have an internal temperature sensor. This subpanel display option is only available if this internal temperature sensor is detected by the PM400.

The numerical display shows a digital measurement of the power or energy with a bar graph along the bottom. The orange and blue triangles on the bar graph show the min and max values detected during the measurement. To reset the min and max values, press the reset button on the front panel. The six rectangular subpanels immediately above the power or energy measurement are configurable displays, allowing the user to select which parameters to view. The Subpanel Display Options table provides a summary of available settings for each style of detector.

Simulated Analog Needle

Measurements can be viewed with a simulated analog needle. The orange and blue marks are indicators for the max and min measured power, and the scale can be zoomed by a factor of 10. Icons down the side of the screen allow the user to set the bandwidth, adjust the resolution of the digital value at the bottom of the display, change units, adjust the display update rate or change screens.

Graph View

In the graph view, the user can monitor the optical power or energy of a source as it changes over time. A second, optional display can be added that shows the readout from a connected temperature sensor (the upper graph in the screenshot above). Icons on the side of the window allow the user to start and stop the measurement, scroll through the data, and open the folder where the measurement is saved.

Statistics Display

In the statistics display, the user can start a sequential measurement. The sample rate and duration can be adjusted from the Capture Settings screen, accessible from the main menu. The bottom bar of the display shows the number of measurements taken, total elapsed time since the measurements were started, and the measurement interval. The main part of the display shows statistics for the accumulated measurements, including the minimum, maximum, mean, and standard deviation.

Spectral Correction

This mode can be entered by pressing the λ symbol on the front panel. The unit can store up to 12 preset spectral correction entries, editable by the user. In their simplest form, these entries can consist of a single user-entered wavelength that will be used in conjunction with the NIST-traceable calibration data from a Thorlabs' sensor to produce a calibrated power measurement. Alternatively, each entry can be a .csv file with the source spectrum that has been uploaded and saved. When a spectral correction entry is selected, the entry name will be displayed in the field above the spectral correction button.

Attenuation Correction

External devices within a setup, such as a filter or beamsplitter, may be needed to attenuate the signal being measured. The attenuation correction function allows the PM400 to display a power reading that accounts for these sources of attenuation. Attenuation values can be assigned as a multiplier (e.g. x2), in percent, in dB, or in OD (optical density). Alternatively, complete filter transmission curves can be uploaded and saved. Up to 12 different attenuation settings can be programmed and stored.

Main Menu

The PM400 main menu allows access to device features including the screen brightness, the menus to set the parameters for power, energy, and temperature measurements, a screen for calculating laser pulse characteristics, and a unit converter.

Capture Settings

This screen allows the user to set the parameters for taking data. User-selectable settings include manual or automatic data acquisition, the exposure time, the number of samples, and the capture interval. It also allows the temperature logging parameters to be set. Once all of the settings are selected, this screen will return an estimated file size so that the user can ensure there is enough free memory on the device. In the case of manual operation (the user manually starts and stops the measurement), the estimated output file size will be the rate at which memory is used up as the data is collected.

Sensor Measurement Settings

This screen allows the user to view sensor-dependent content, adjust common settings such as wavelength, attenuation, mode, etc., and enter beam parameters.

Temperature Sensor Settings

If an external temperature sensor is hooked up to the PM400, the user can adjust the parameters here.

Laser Calculator and Unit Converter

The PM400 has several calculators. The laser calculator screen allows the user to calculate laser beam parameters based on available inputs. A unit converter provides quick conversions between Watts and dBm or between wavelength, frequency, wavenumbers, and photon energy.

Position Trace Display (Thermal Position Sensors Only)

When used with the S440C or S442C thermal position sensors, the PM400 console can display a trace of the beam's position within a Ø1 mm circle or Ø6 mm circle on the sensor surface. The total beam power is also monitored in this mode.

Position Graph Display (Thermal Position Sensors Only)

Similar to the graph display above, the console can display a graph of the beam's X and Y coordinates over time when used with the S440C or S442C sensors. The user can toggle between this plot and a plot of the the beam's total power over time.

The PM400 is capable of supporting any of Thorlabs' C-Series sensor heads as well as some third-party and custom detectors. The main connections are shown in the photo below, and the pin diagrams below are provided to aid in determining sensor compatibility. Compatible sensor specifications are provided on the Specs tab.

Power Meter Connectors
Top View of the PM400 Console

Optical Sensor Head Input

9-Pin Female D-Sub

Pin	Connection
1	+5 V (100 mA Max Current from this Pin)
2	DO NOT USE^a
3	AGND (Analog Ground): Photodiode Ground (Anode), Thermal and Pyroelectric Sensor Ground
4	Photodiode Cathode
5	Pyroelectric Sensor +
6	DGND (Digital Ground)
7	Present: Connect this Pin via a 1 kΩ to 10 kΩ Resistor to Pin 3 (AGND) to Enable a Custom Sensor
8	Thermal Sensor +
9	Not Connected

Pin 2 is reserved for the EEPROM Digital I/O (memory in Thorlabs' sensor heads) and MUST NOT be used. Connecting this pin may cause the PM400 to malfunction.

Auxiliary Connector

14-Pin Dual-In-Line Socket, 0.1" (2.54 mm) Pitch

Pin	Connection
1	Ground
2	+3.3 VDC, 0.1 A
3	Do Not Use (No Function)
4	ADC Current In (Humidity Sensor)
5	Temp / Humidity Detection Module
6	ADC Current In (Temperature Sensor)
7	GPIO 02
8	GPIO 01
9	GPIO 03
10	GPIO 04
11	Ground
12	+ 2.5 VDC, 0.05 A
13	Ground
14	-2.5 VDC, 0.05 A

Mini-B USB 2.0 Port

For Remote Control with a Mini-USB Device and Charging

Analog Output

0 to 2 V,
3.5 mm Mono Audio (2P) Jack

Temperature Sensor Input

2.5 mm Stereo Audio (2P) Jack
for NTC

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The PM400 is shipped in an eco-friendly package.

Included Components

Power Meter Console with Multi-Touch Technology
BNC to 3.5 mm Mono Audio Adapter for Analog Output
USB Cable, Type A to Mini B
Operating Manual
Certificate of Calibration

Compatible Power Meters

PM100A Analog Power and Energy Meter Console
PM100D Digital Power and Energy Meter Console
PM101 Series Power Meter Interfaces with External Readout (Version 2.0 or Later)
PM102 Series Power Meter Interfaces with External Readout (Version 2.1 or Later)
PM100USB USB Interface Digital Power and Energy Meter
PM400 Capacitive Touchscreen Power and Energy Meter Console
PM160, PM160T, and PM160T-HP Wireless Handheld Power Meters with Bluetooth^® Technology
PM16 Series Compact USB Power Meters

The Optical Power Monitor software is not compatible with the PM320E Benchtop Power Meter.

Optical Power Monitor

The Optical Power Monitor GUI software features power measurement, readout from up to eight power meters, and remote wireless operation.

For details on specific software features, please see the user manual, which can be downloaded here.

Users interested in the legacy Power Meter Software can find it by visiting the software page here.

The PM101 Series Power Meters are only compatible with version 2.0 or later. The PM102 Series Power Meters are only compatible with version 2.1 or later.

Optical Power Monitor GUI Software for Touchscreen, Handheld, and USB-Interface Power Meters

Features

Operate up to Eight Power Meters Simultaneously
Record and Analyze Measurements in Real Time
Intuitive Analog Display and Graphing Modes
Configurable Long-Term Data Logging
Also Supports Position Measurements with Thermal Position & Power Sensors
Compatible with USB and Bluetooth^® Connections

The Optical Power Monitor software GUI enables seamless control of up to eight power meters that are connected via USB, RS232, or Bluetooth^® wireless technology^a. The latest software, firmware, drivers, and utilities for these power meters can be downloaded here.

Multiple data measurement and analysis functions are integrated into the GUI package. The interface offers a user-friendly design with minimal use of color and low brightness that is ideal use in dark lab environments while wearing laser safety glasses. Measured data can be displayed in real time as a simulated analog needle, digital values, line graph, or bar graph. Continuously logged and short-term measurements can be recorded for data viewing and analysis at a later point. A built-in statistics mode analyzes measured data and continuously updates to reflect new measurements within the pre-determined measurement period. Beam position measurements are also supported when used with our thermal position & power sensors.

The Optical Power Monitor software package installs the GUI, which then can be used to control the touchscreen, handheld, or USB-interface power meters. Firmware updates for supported power meters are also available. Programming examples and drivers for interfacing with our power and energy meter consoles using LabVIEW, C/C++, Visual C#, and Python are installed with the software; refer to the manual for details.

Please note that the Optical Power Monitor Software uses different drivers than the Power Meter Utilities Software and Thorlabs recommends using the new driver TLPM.dll. For users who wish to use the legacy Power Meter Software or use custom software designed using the older PM100D.dll driver, a Power Meter Driver Switcher program is included for easy swapping of the installed driver between the two versions.

a. The PM160, PM160T, and PM160T-HP power meters are equipped with Bluetooth^® connections.

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Power Measurement Mode: Set up and configure up to eight power meters.

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Power Tuning Mode: Simulated analog needle and digital measurement value provided. Delta Mode, enabled above, shows the fluctuation range during the measurement period.

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Power Statistics Mode: Calculate numerical statistics for a pre-determined measurement period. The panel displays the analyzed values in a bar graph and the results as numerical values.

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Position Tuning Mode: Tuning mode can be used with a thermal position & power sensor to aid in beam alignment.

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Position Statistics Mode: Statistics mode also provides aggregate information for thermal position & power sensors.

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Data Logging: Enable long-term measurement and simultaneous recording from up to eight power meters. Save data as .csv files for later processing while measurement results are displayed in a graph in real time.

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The PM160 wireless power meter, shown here with an iPad mini (not included), can be remotely operated using Apple mobile devices.

This tab outlines the full selection of Thorlabs' power and energy sensors. Refer to the lower right table for power meter console and interface compatibility information.

In addition to the power and energy sensors listed below, Thorlabs also offers all-in-one, wireless, handheld power meters and compact USB power meter interfaces that contain either a photodiode or a thermal sensor, as well as power meter bundles that include a console, sensor head, and post mounting accessories.

Thorlabs offers four types of sensors:

Photodiode Sensors: These sensors are designed for power measurements of monochromatic or near-monochromatic sources, as they have a wavelength dependent responsivity. These sensors deliver a current that depends on the input optical power and the wavelength. The current is fed into a transimpedance amplifier, which outputs a voltage proportional to the input current.
Thermal Sensors: Constructed from material with a relatively flat response function across a wide range of wavelengths, these thermopile sensors are suitable for power measurements of broadband sources such as LEDs and SLDs. Thermal sensors deliver a voltage proportional to the input optical power.
Thermal Position & Power Sensors: These sensors incorporate four thermopiles arranged as quadrants of a square. By comparing the voltage output from each quadrant, the unit calculates the beam's position.
Pyroelectric Energy Sensors: Our pyroelectric sensors produce an output voltage through the pyroelectric effect and are suitable for measuring pulsed sources, with a repetition rate limited by the time constant of the detector. These sensors will output a peak voltage proportional to the incident pulse energy.

Console Compatibility
Console Item #	PM100A	PM100D	PM400	PM320E	PM101 Series	PM102 Series	PM100USB
Photodiode Power						-
Thermal Power
Thermal Position	-	-		-	-		-
Pyroelectric Energy	-				-	-

Power and Energy Sensor Selection Guide

There are two options for comparing the specifications of our Power and Energy Sensors. The expandable table below sorts our sensors by type (e.g., photodiode, thermal, or pyroelectric) and provides key specifications.

Alternatively, the selection guide graphic further below arranges our entire selection of photodiode and thermal power sensors by wavelength (left) or optical power range (right). Each box contains the item # and specified range of the sensor. These graphs allow for easy identification of the sensor heads available for a specific wavelength or power range.

Photodiode Power Sensors

Thermal Power Sensors

Thermal Position & Power Sensors

Pyroelectric Energy Sensors

The response time of the photodiode sensor. The actual response time of a power meter using these sensors will be limited by the update rate of your power meter console.
Typical natural response time (0 - 95%). Our power consoles can provide estimated measurements of optical power on an accelerated time scale (typically <1 s) when the natual response time is approximately 1 s or greater. As the natural response times of the S415C, S425C, and S425C-L are fast, these do not benefit from accelerated measurements and this function cannot be enabled. For more information, see the Operation tab here.
With intermittent use: maximum exposure time of 20 minutes for the S401C, otherwise maximum exposure time is 2 minutes.
All pyroelectric sensors have a 20 ms thermal time constant, τ. This value indicates how long it takes the sensor to recover from a single pulse. To detect the correct energy levels, pulses must be shorter than 0.1τ and the repetition rate of your source must be well below 1/τ.

Sensor Options
(Arranged by Wavelength Range)

Sensor Options
(Arranged by Power Range)

Sensor Key

Posted Comments:

zhaozhao mao (posted 2020-12-08 01:01:28.267)

需要功率计表头和探头，1250~1550nm，mW级

wskopalik (posted 2020-12-08 10:16:41.0)

Thank you for your inquiry! We will contact you directly to provide further assistance.

Juyoung Kim (posted 2020-04-21 21:28:05.647)

Dear PM400 support team, I would like to confirm with the team with one question: Can C(++) talk to PM400 and get the power meter output and the instrument clock at the same time? I am pretty sure about this feature, but could you point me relevant C(++) functions? If possible, could you send me any example code for this basic operation? I would appreciate it much. Thank you. Best regards, Juyoung

wskopalik (posted 2020-04-22 11:49:39.0)

This is a response from Wolfgang at Thorlabs. Thank you very much for your inquiry! You would need to use two commands in this case. At first, you need to use one of the measurement commands, e.g. "TLPM_measPower" or "TLPM_measEnergy" depending on the sensor you use. After that, you can read the time by using "TLPM_getTime". This command is available on PM100D, PM200, and PM400 power meters and returns the time as it is set on the power meter. Alternatively, you can also read the time which is set on your computer by using a C/C++ library. I will contact you directly to provide further assistance.

Matt Dabrowski (posted 2020-03-04 16:55:00.953)

I am using a PM400. Recently, I went to update the firmware, and I connected the PM400 to the computer. When I used the latest OPM software to update the firmware I always got the following warning: "user abort the download operation" but I haven't done anything. Hoping for your answer. Thanks. Regards, Matt Dabrowski

dpossin (posted 2020-03-06 10:05:31.0)

Dear Matt, Thank you for your feedback. We are currently working on an firmware revision to eliminate this issue. We already contacted you regarding an solution. We will upload an firmware update on the website as soon as possible.

user (posted 2018-05-24 12:34:50.27)

On your old PM100 Powermeters the display backlight could be turned off. Can the display on the PM400 also be turned off, while continuing to capture data via LabView/USB?

mvonsivers (posted 2018-06-07 03:56:07.0)

This is a response from Moritz at Thorlabs. Thank you for your inquiry. The display cannot be completely turned off but the brightness can be dimmed to 1%.

zahariev (posted 2018-03-23 09:42:41.347)

The power meter do the great job. However I have a comment. Even been specified in the shipping list, the idea to sell it without power adapter (charger) could cos some inconvenience.

swick (posted 2018-04-16 04:40:04.0)

This is a response from Sebastian at Thorlabs. Thank you for the feedback. We are glad to hear you are happy with our PM400. The PM400 includes a USB cable which can be used to charge the device via USB ports. I understand that it would be helpful to have an USB charger included to the PM400. We will internally discuss your comment.

arkke.eskola (posted 2016-10-27 13:14:48.693)

Hi, I am thinking to buy PM400. Important option for my application would be to control it using LabVIEW, in my case LabVIEW2015. Do you have LabVIEW2015 drivers for PM400? Thanks, Arkke Eskola

wskopalik (posted 2016-10-28 03:59:43.0)

This is a response from Wolfgang at Thorlabs. Thank you for your inquiry. We provide LabView drivers as well as drivers for C/C++ and DotNet for the PM400. They are included in the installation package you can find here on the website. I will contact you directly to provide further details.

Thorlabs offers a wide selection of power and energy meter consoles and interfaces for operating our power and energy sensors. Key specifications of all of our power meter consoles and interfaces are presented below to help you decide which device is best for your application. We also offer self-contained wireless power meters and compact USB power meters.

When used with our C-series sensors, Thorlabs' power meter consoles and interfaces recognize the type of connected sensor and measure the current or voltage as appropriate. Our C-series sensors have responsivity calibration data stored in their connectors. The console will read out the responsivity value for the user-entered wavelength and calculate a power or energy reading.

Photodiode sensors deliver a current that depends on the input optical power and the wavelength. The current is fed into a transimpedance amplifier, which outputs a voltage proportional to the input current. The photodiode's responsivity is wavelength dependent, so the correct wavelength must be entered into the console for an accurate power reading. The console reads out the responsivity for this wavelength from the connected sensor and calculates the optical power from the measured photocurrent.
Thermal sensors deliver a voltage proportional to the input optical power. Based on the measured sensor output voltage and the sensor's responsivity, the console will calculate the incident optical power.
Energy sensors are based on the pyroelectric effect. They deliver a voltage peak proportional to the pulse energy. If an energy sensor is recognized, the console will use a peak voltage detector and the pulse energy will be calculated from the sensor's responsivity.

The consoles and interfaces are also capable of providing a readout of the current or voltage delivered by the sensor. Select models also feature an analog output.

Consoles

Item #	PM100A	PM100D	PM400	PM320E
(Click Photo to Enlarge)
Key Features	Analog Power Measurements	Digital Power and Energy Measurements	Digital Power and Energy Measurements, Touchscreen Control	Dual Channel
Compatible Sensors	Photodiode and Thermal Power	Photodiode and Thermal Power; Pyroelectric
Housing Dimensions (H x W x D)	7.24" x 4.29" x 1.61" (184 mm x 109 mm x 41 mm)	7.09" x 4.13" x 1.50" (180 mm x 105 mm x 38 mm)	5.35" x 3.78" x 1.16" (136.0 mm x 96.0 mm x 29.5 mm)	4.8" x 8.7" x 12.8" (122 mm x 220 mm x 325 mm)
Channels	1			2
External Temperature Sensor Input (Sensor not Included)	-	-	Instantaneous Readout and Record Temperature Over Time	-
External Humidity Sensor Input (Sensor not Included)	-	-	Instantaneous Readout and Record Humidity Over Time	-
GPIO Ports	-		4, Programmable	-
Source Spectral Correction	-	-		-
Attenuation Correction	-	-		-
External Trigger Input	-	-	-
Display
Type	Mechanical Needle and LCD Display with Digital Readout	320 x 240 Pixel Backlit Graphical LCD Display	Protected Capacitive Touchscreen with Color Display	240 x 128 Pixels Graphical LCD Display
Dimensions	Digital: 1.9" x 0.5" (48.2 mm x 13.2 mm) Analog: 3.54" x 1.65" (90.0 mm x 42.0 mm)	3.17" x 2.36" (81.4 mm x 61.0 mm)	3.7" x 2.1" (95 mm x 54 mm)	3.7" x 2.4" (94.0 mm x 61.0 mm)
Refresh Rate	20 Hz		10 Hz (Numerical) 25 Hz (Analog Simulation)	20 Hz
Measurement Views^a
Numerical
Mechanical Analog Needle		-	-	-
Simulated Analog Needle	-
Bar Graph	-
Trend Graph	-
Histogram	-		-
Statistics
Memory
Type	-	SD Card	NAND Flash	-
Size	-	2 GB	4 GB	-
Power
Battery	LiPo 3.7 V 1300 mAh		LiPo 3.7 V 2600 mAh	-
External	5 VDC via USB or Included AC Adapter		5 VDC via USB	Selectable Line Voltage: 100 V, 115 V, 230 V (±10%)

These are the measurement views built into the unit. All of our power meter consoles except the PM320E can be controlled using the Optical Power Monitor software package. The PM320E has its own software package.

Interfaces

Item #	PM101	PM101A	PM101R	PM101U	PM100USB
(Click Photo to Enlarge)
Key Features	USB, RS232, UART, and Analog Operation	USB and Analog SMA Operation	USB and RS232 Operation	USB Operation	USB Operation
Compatible Sensors	PM101 Series: Photodiode and Thermal Power PM102 Series: Thermal Power and Thermal Position & Power				Photodiode and Thermal Power; Pyroelectric
Housing Dimensions (H x W x D)	3.80" x 2.25" x 1.00" (96.5 x 57.2 x 25.4 mm)	3.94" x 2.25" x 1.00" (100.0 x 57.2 x 25.4 mm)	3.78" x 2.25" x 1.00" (95.9 x 57.2 x 25.4 mm)	3.68" x 2.25" x 1.00" (93.6 x 57.2 x 25.4 mm)	3.67" x 2.38 " x 1.13" (93.1 x 60.4 x 28.7 mm)
Channels	1
External Temperature Sensor Input (Sensor Not Included)	NTC Thermistor	-
External Humidity Sensor Input (Sensor not Included)	-
GPIO Ports	-
Source Spectral Correction	-
Attenuation Correction	-
External Trigger Input	-
Display
Type	No Built-In Display; Controlled via GUI for PC
Refresh Rate	Up to 1000 Hz^a				Up to 300 Hz^a
Measurement Views^b
Numerical	Requires PC^b
Mechanical Analog Needle	-
Simulated Analog Needle	Requires PC^b
Bar Graph	Requires PC^b
Trend Graph	Requires PC^b
Histogram	Requires PC^b
Statistics	Requires PC^b
Memory
Type	Internal Non-Volatile Memory for All Settings				-
Size	-
Power
Battery	-
External	5 VDC via USB or 5 to 36 VDC via DA-15	5 VDC via USB

Dependent on PC Settings
These power meter interfaces do not have a built-in monitor, so all data must be displayed through a PC running the Optical Power Meter Software.

Touchscreen Power and Energy Meter Console with Multi-Touch Technology

Zoom

Click to Enlarge

View Imperial Product List

Item #	Qty	Description
PM400	1	Projected Capacitive Touchscreen Optical Power and Energy Meter Console
S120C	1	Standard Photodiode Power Sensor, Si, 400 - 1100 nm, 50 mW
TSP-TH	1	Additional External Temperature Probe, -15 °C to 200 °C
VH1	1	Miniature V-Clamp, 0.42" Long, 8-32 Tapped Hole
UPH2	2	Ø1/2" Universal Post Holder, Spring Loaded Locking Thumbscrew, L = 2"
TR2	2	Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 2"
SH8S0625	2	8-32 Stainless Steel Cap Screws, 5/8" Long, 50 Pack

View Metric Product List

Item #	Qty	Description
PM400	1	Projected Capacitive Touchscreen Optical Power and Energy Meter Console
S120C	1	Standard Photodiode Power Sensor, Si, 400 - 1100 nm, 50 mW
TSP-TH	1	Additional External Temperature Probe, -15 °C to 200 °C
VH1/M	1	Miniature V-Clamp, 0.42" Long, M4 Tapped Hole
UPH50/M	2	Ø12.7 mm Universal Post Holder, Spring-Loaded Locking Thumbscrew, L = 50 mm
TR50/M	2	Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 50 mm
SH4MS16	2	M4 x 0.7 Stainless Steel Cap Screw, 16 mm Long, 50 Pack

PM400 with S120C Photodiode Sensor (Available Below) and TSP-TH Temperature Sensor

Compact Power Meter Console
Projected Capacitive Touchscreen with Multi-Touch Technology
Compatible with Over 30 Power and Energy Sensors (Available Below)
Inputs for Third-Party and Custom Sensors
4 GB Internal Memory
USB 2.0 Interface for Control via PC

Thorlabs' PM400 power meter console is compatible with over 30 power and energy sensors, available below. When used with these sensors, the console will automatically detect and read the sensor calibration information stored in the sensor connector and combine this data with a user-set measurement wavelength to provide calibrated power or energy measurements. The console can also be used with third-party or custom sensors that meet the compatibility requirements outlined on the Specs tab.

Thorlabs offers a recalibration service for the PM400; contact Tech Support for details. Alternatively, if you have a corresponding sensor that needs recalibrating, you can include the PM400 with the sensor for recalibration at no additional cost. To order this service, scroll to the bottom of the page and select the appropriate Item # that corresponds to your sensor.

Standard Photodiode Power Sensors

S120C and quick release 30mm Cage System

Click to Enlarge
S120C and CP44F Quick-Release Mount

For General Purpose Optical Power Measurements
Integrated Viewing Target for Easy Sensor Alignment
Ø9.5 mm Sensor Aperture
Sensor, Protective Cap, IR Target, and Thread Adapter Included
Fiber Adapters Available Separately (See Table Below)
See the Full Web Presentation for More Information

These Standard Photodiode Power Sensors are ideal for metering low power coherent and incoherent sources from the UV to the NIR. Each NIST-Traceable, calibrated sensor features an integrated viewing target for easy alignment, enhanced shielding against electromagnetic interference, an over-temperature-alert device, and a large Ø9.5 mm sensor aperture. The sensors are compatible with 30 mm cage systems, Ø1/2" posts, and SM1 (1.035"-40) lens tubes, and are ideal for free-space and fiber-coupled sources.

Thorlabs offers a recalibration service for these photodiode power sensors, which can be ordered below (see Item # CAL1 for Si sensors and Item # CAL2 for Ge sensors).

Item #^a	S120VC	S120C	S121C	S122C
Sensor Image (Click the Image to Enlarge)
Aperture Size	Ø9.5 mm
Wavelength Range	200 - 1100 nm	400 - 1100 nm	400 - 1100 nm	700 - 1800 nm
Power Range	50 nW - 50 mW		500 nW - 500 mW	50 nW - 40 mW
Detector Type	Si Photodiode (UV Extended)	Si Photodiode		Ge Photodiode
Linearity	±0.5%
Resolution^b	1 nW		10 nW	2 nW
Measurement Uncertainty^c	±3% (440 - 980 nm) ±5% (280 - 439 nm) ±7% (200 - 279 nm, 981 - 1100 nm)	±3% (440 - 980 nm) ±5% (400 - 439 nm) ±7% (981 - 1100 nm)		±5%
Responsivity^d (Click for Plot)	Raw Data	Raw Data	Raw Data	Raw Data
Coating/Diffuser	Reflective ND (OD1.5)^e	Reflective ND (OD1)^f	Reflective ND (OD2)^g	Absorptive ND (Schott NG9)
Head Temperature Measurement	NTC Thermistor 4.7 kΩ
Housing Dimensions	Ø30.5 mm x 12.7 mm
Cable Length	1.5 m
Post Mounting^e,f,g	Universal 8-32 / M4 Tap, Post Not Included
Aperture Thread	External SM1 (1.035"-40)
Compatible Fiber Adapters	S120-FC, S120-APC, S120-SMA, S120-ST, S120-LC, and S120-SC (Not Included)
Compatible Consoles	PM400, PM100D, PM100A, and PM320E
Compatible Interfaces	PM101, PM101A, PM101R, PM101U, and PM100USB

For complete specifications, please see the Specs tab here.
Measured with PM100D console in low bandwidth setting.
Beam diameter > 1 mm.
All sensor responsivities are calibrated to a NIST-traceable source with measurements taken in 5 nm intervals.
For the S120VC, these specifications are valid for devices with serial numbers 1203xxx or higher. Older versions had a reflective ND diffuser (OD1). Additionally, they came with an 8-32 tap and M4 adapter. For additional information, please contact technical support.
For the S120C, these specifications are valid for devices with serial numbers 1203xxx or higher. Older versions had an absorptive ND diffuser (Schott NG3). Additionally, they came with an 8-32 tap and M4 adapter. For additional information, please contact technical support.
For the S121C, these specifications are valid for devices with serial numbers 1203xxx or higher. Older versions had a absorptive ND diffuser (Schott NG9). Additionally, they came with an 8-32 tap and M4 adapter. For additional information, please contact technical support.

Slim Photodiode Power Sensors

Click to Enlarge

View Imperial Product List

Item #	Qty	Description
Imperial Product List
S130C	1	Slim Photodiode Power Sensor, Si, 400 - 1100 nm, 500 mW
CP02	2	SM1-Threaded 30 mm Cage Plate, 0.35" Thick, 2 Retaining Rings, 8-32 Tap
TR6	1	Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 6"
ER6-P4	3	Cage Assembly Rod, 6" Long, Ø6 mm, 4 Pack
CM1-BS013	1	30 mm Cage Cube-Mounted Non-Polarizing Beamsplitter, 400 - 700 nm, 8-32 and M4 Adapters

View Metric Product List

Item #	Qty	Description
Metric Product List
S130C	1	Slim Photodiode Power Sensor, Si, 400 - 1100 nm, 500 mW
CP02/M	2	SM1-Threaded 30 mm Cage Plate, 0.35" Thick, 2 Retaining Rings, M4 Tap
TR150/M	1	Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 150 mm
ER6-P4	3	Cage Assembly Rod, 6" Long, Ø6 mm, 4 Pack
CM1-BS013	1	30 mm Cage Cube-Mounted Non-Polarizing Beamsplitter, 400 - 700 nm, 8-32 and M4 Adapters

S130C Sensor in a 30 mm Cage

Click for Details
SM1A29 SM1 Thread Adapter
Mounted on a S130C Sensor

Click for Details

View Product List

Item #	Qty	Description
Universal Product List
S130C	1	Slim Photodiode Power Sensor, Si, 400 - 1100 nm, 500 mW
FB-51	1	Single-Axis FiberBench, L = 51 mm, 5 Positions
FBSM	1	FiberBench Mount for Slim Photodiode Sensors
HCA3-SM1	1	FiberBench Wall Plate, FiberPort Compatible, Internally SM1-Threaded
PAF-X-5-B	1	FiberPort, FC/PC & FC/APC, f=4.6 mm, 600 - 1050 nm, Ø1.00 mm Waist
FBR-LPVIS	1	Rotating Linear Polarizer Module, 500 - 720 nm, Ø2.5 mm CA

S130C Photodiode Sensor Mounted in FiberBench System Using FBSM Mount

For Optical Power Measurements in Confined Spaces
Very Slim Design: 5 mm Thin on Sensor Side
Ø9.5 mm Sensor Aperture
Slideable ND Filter Automatically Changes Sensor Power Range
Optional SM1A29 Adapter with VIS/IR Target and External SM1 Threading (More Details)
Optional FBSM Mount with VIS/IR Target for FiberBench Systems (More Details)
See the Full Web Presentation for More Information

These Slim Photodiode Power Sensors are designed to take optical source power measurements in locations where space and accessibility are at a premium. The 5 mm thin sensor end can fit between closely spaced optics, cage systems, and other arrangements where standard power meters may not fit. The NIST-Traceable, calibrated sensors also feature a large Ø9.5 mm sensor aperture and slideable neutral density filter for dual power ranges in one compact device.

A separately available SM1A29 adapter can be attached by 2 setscrews to any S130 series power sensor to mount fiber adapters, light shields, filters or any other SM1-threaded (1.035"-40) mechanics or optics. The FBSM Mount allows our S130 series power sensors to be mounted vertically into FiberBench systems for stable mounting with a minimal footprint.

Thorlabs offers a recalibration service for these photodiode power sensors, which can be ordered below (see Item # CAL-S130 for Si sensors and Item # CAL-S132 for Ge sensors).

Item #^a	S130VC	S130C	S132C
Sensor Image (Click the Image to Enlarge)
Aperture Size	Ø9.5 mm
Wavelength Range	200 - 1100 nm	400 - 1100 nm	700 - 1800 nm^b
Power Range (with Filter)	500 pW - 0.5 mW^c (Up to 50 mW)^c	500 pW - 5 mW (Up to 500 mW)	5 nW - 5 mW (Up to 500 mW)
Detector Type	Si Photodiode (UV Extended)	Si Photodiode	Ge Photodiode
Linearity	±0.5%
Resolution	100 pW^d		1 nW^e
Measurement Uncertainty^f	±3% (440 - 980 nm) ±5% (280 - 439 nm) ±7% (200 - 279 nm, 981 - 1100 nm)	±3% (440 - 980 nm) ±5% (400 - 439 nm) ±7% (981 - 1100 nm)	±5%
Responsivity^g (Click for Plot)	Raw Data	Raw Data	Raw Data
Coating/Diffuser	Reflective ND (OD1.5)^c	Reflective ND (OD2)^h	Absorptive ND (Schott NG9/KG3)^b
Housing Dimensions	150 mm x 19 mm x 10 mm; 5 mm Thickness on Sensor Side
Cable Length	1.5 m
Post Mounting	8-32 and M4 Taps
Adapters (Not Included)	SM1A29: Add SM1 Thread and Viewing Target to Aperture Fiber Adapters Compatible with SM1A29 Adapter: S120-FC, S120-APC, S120-SMA, S120-ST, S120-LC, and S120-SC FBSM: Integrate Sensor into FiberBench Setups
Compatible Consoles	PM400, PM100D, PM100USB, PM100A, and PM320E
Compatible Interfaces	PM101, PM101A, PM101R, PM101U, and PM100USB

For complete specifications, please see the Specs tab here.
For the S132C, these specifications are valid for devices with serial numbers 1203xxx or higher. Older versions had a reflective ND diffuser (OD1), which would decrease the wavelength range from 700 nm to 1800 nm to 1200 nm to 1800 nm. For additional information, please contact technical support.
For the S130VC, these specifications are valid for devices with serial numbers 1203xxx or higher. Older versions had an optical power range of 5 nW to 5 mW (50 nW to 50 mW with filter) and a reflective ND diffuser (OD1). For additional information, please contact technical support.
Measured with PM100D console in low bandwidth setting, without filter.
Measured with PM100D console in low bandwidth setting at 1550 nm, without filter.
Beam Diameter > 1 mm.
All sensor responsivities are calibrated to a NIST-traceable source with measurements taken in 5 nm intervals.
For the S130C, these specifications are valid for devices with serial numbers 1203xxx or higher. Older versions had an absorptive ND diffuser (Schott NG9). For additional information, please contact technical support.

SM1A29 is an adapter that can be attached by 2 set screws to any S130 series power sensor. This gives the possibility to mount fiber adapters, light shields, filters or any other SM1 threaded mechanics or optics.

Microscope Slide Photodiode Power Sensor

Item #^a	S170C
Sensor Image (Click Image to Enlarge)
Overall Dimensions	76.0 mm x 25.2 mm x 5.0 mm (2.99" x 0.99" x 0.20")
Active Detector Area	18 mm x 18 mm
Input Aperture	20 mm x 20 mm
Wavelength Range	350 - 1100 nm
Optical Power Working Range	10 nW - 150 mW
Detector Type	Silicon Photodiode
Linearity	±0.5%
Resolution^b	1 nW
Calibration Uncertainty^c	±3% (440 - 980 nm) ±5% (350 - 439 nm) ±7% (981 - 1100 nm)
Responsivity^d (Click for Plot)	Raw Data
Neutral Density Filter	Reflective (OD 1.5)
Cable Length	1.5 m
Post Mounting	Universal 8-32 / M4 Tap, Post Not Included
Compatible Consoles	PM400, PM100D, PM100A, and PM320E
Compatible Interfaces	PM101, PM101A, PM101R, PM101U, and PM100USB

For complete specifications, please see the Specs tab here.
Measured with PM100D console in low bandwidth setting.
Beam diameter > 1 mm.
All sensor responsivities are calibrated to a NIST-traceable source with measurements taken in 5 nm intervals.

Wavelength Range: 350 nm to 1100 nm
Sensitive to Optical Powers from 10 nW to 150 mW
Designed to Measure Optical Power at the Sample Plane of a Microscope
Silicon Photodiode with Large 18 mm x 18 mm Active Area
Sensor Housing Dimensions: 76.0 mm x 25.2 x 5.0 mm
Index Matching Gel Utilized in Design to Prevent Internal Reflections
Information Stored in Connector
- Sensor Data
- NIST- and PTB-Traceable Calibration Data
Post Mountable via 8-32 (M4) Tap

The S170C Microscope Slide Power Sensor Head is a silicon photodiode sensor designed to measure the power at the sample in microscopy setups. The silicon photodiode can detect wavelengths between 350 nm and 1100 nm at optical powers between 10 nW and 150 mW. The sensor head's 76.0 mm x 25.2 mm footprint matches that of a standard microscope slide and is compatible with most standard upright and inverted microscopes.

The photodiode has an 18 mm x 18 mm active area and is contained in a sealed housing behind a neutral density (ND) filter with OD 1.5. A 20 mm x 20 mm indentation around the surface of the ND filter is sized to accept standard microscope cover slips. An immersion medium (water, glycerol, oil) may be placed in this well directly over the ND filter, or a cover slip may be inserted first to simplify clean up. The gap between the photodiode and the neutral density filter has been filled with an index matching gel in order to prevent internal reflections from causing significant measurement errors when using high NA objectives with oil or water.

The bottom of the sensor housing features a laser-engraved grid to aid in aligning and focusing the beam. In standard microscopes, this grid can be used for beam alignment before flipping the sensor head to face the objective for power measurements. In inverted microscopes, turn on the transmitted illuminator to align the grid on the detector housing with the beam, thereby centering the sensor in front of the objective. Alternatively, the diffusive surface of the ND filter can be used as a focusing plane.

Sensor specifications and the NIST- and PTB-traceable calibration data are stored in non-volatile memory in the sensor connector and can be read out by the latest generation of Thorlabs power meters. We recommend yearly recalibration to ensure accuracy and performance. Calibration may be ordered using the CAL1 recalibration service available below. Please contact technical support for more information.

Thorlabs also offers a Microscope Slide Sensor Head with a thermal sensor; for complete specifications, the full presentation can be found here.

Microscope Slide Thermal Power Sensor

Item #^a	S175C
Sensor Image (Click Image to Enlarge)
Active Detector Area	18 mm x 18 mm
Wavelength Range	0.3 - 10.6 µm
Power Range	100 µW - 2 W
Detector Type	Thermal Surface Absorber (Thermopile)
Linearity	±0.5%
Resolution^b	10 µW
Measurement Uncertainty^c	±3% @ 1064 nm; ±5% @ 300 nm - 10.6 µm
Response Time	3 s (<2 s from 0 to 90%)
Housing Dimensions	76 mm x 25.2 mm x 4.8 mm (2.99" x 0.99" x 0.19")
Cable Length	1.5 m
Housing Features	Integrated Glass Cover Engraved Laser Target on Back
Post Mounting	N/A
Cage Mounting	N/A
Aperture Thread	N/A
Compatible Consoles	PM400, PM100D, PM100A, and PM320E
Compatible Interfaces	PM101, PM101A, PM101R, PM101U, PM102, PM102A, PM102U, and PM100USB

For complete specifications, please see the Specs tab here.
Measured with the legacy PM200 Touch Screen Console
Beam Diameter: >1 mm

Click to Enlarge
Typical absorption curve for the S175C (glass and absorber). Note that this curve is representative, and the actual absorption across the spectrum will vary from unit to unit.

Click to Enlarge
The back of the S175C housing is engraved with the sensor specifications and a target for centering the beam on the sensor.

Wavelength Range: 300 nm - 10.6 µm
Sensitive to Optical Powers from 100 µW to 2 W
Designed to Measure Optical Power in the Sample Plane of a Microscope
Thermal Sensor with 18 mm x 18 mm Active Area
76.0 mm x 25.2 mm Footprint Matches Standard Microscope Slides
Information Stored in Connector
- Sensor Data
- NIST- and PTB-Traceable Calibration Data
See the Full Web Presentation for More Information

The S175C Microscope Slide Thermal Power Sensor Head is designed to measure the power at the sample in microscopy setups. The thermal sensor can detect wavelengths between 300 nm and 10.6 µm at optical powers between 100 µW and 2 W. The sensor head's 76.0 mm x 25.2 mm footprint matches that of a standard microscope slide and is compatible with most standard upright and inverted microscopes.

The thermal sensor has an 18 mm x 18 mm active area and is contained in a sealed housing behind a glass cover. An immersion medium (water, glycerol, oil) may be placed over the glass cover plate.

As seen in the image to the right, the bottom of the sensor housing features a laser-engraved target to aid in aligning and focusing the beam. In standard microscopes, the target can be used for beam alignment before flipping the sensor head to face the objective for power measurements. In inverted microscopes, turn on the trans-illumination lamp and align the target on the detector housing with the beam; this will center the sensor in front of the objective.

Sensor specifications and the NIST- and PTB-traceable calibration data are stored in non-volatile memory in the sensor connector and can be read out by the latest generation of Thorlabs power meters. We recommend yearly recalibration to ensure accuracy and performance. Calibration may be ordered using the CAL-S200 recalibration service available below. Please contact technical support for more information.

Thorlabs also offers a Microscope Slide Sensor Head with a photodiode sensor for low-power, high-resolution measurements; the full presentation may be found here.

Integrating Sphere Photodiode Power Sensors

Click to Enlarge
S142C and S140-BFA Bare Fiber Adapter (Sold Separately)

Click to Enlarge
S142C with the S120-FC Fiber Adapter (Included)

For Measurements Independent of Beam Shape and Entrance Angle
Integrating Sphere Design Acts as a Diffuser with Minimal Power Loss
Ø5 mm, Ø7 mm, or Ø12 mm Input Aperture
Removable S120-FC Fiber Adapter (FC/PC and FC/APC) Included
Compatible Fiber Adapters for Terminated and Bare Fiber (See Table Below)
See the Full Web Presentation for More Information

These Integrating Sphere Photodiode Power Sensors are the ideal choice for power measurements independent of beam uniformity, divergence angle, beam shape, or entrance angle, making them excellent for use with fiber sources and off-axis free space sources.

Our integrating spheres are designed for wavelength ranges from the visible through the NIR. Sensor heads for use between 350 and 2500 nm use a single Ø1" or Ø2" sphere made from Zenith^® PTFE and feature a black housing to minimize reflected light around the entrance aperture. These sensors use either a silicon photodiode for detection in the 350 - 1100 nm range or an InGaAs photodiode for detection in the 800 - 1700 nm, 900 - 1650 nm, or 1200 - 2500 nm wavelength range.

The S180C integrating sphere for 2.9 - 5.5 µm uses two connected, gold-plated Ø20 mm spheres, with an entrance port in the first sphere and a port for the MCT (HgCdTe) detector located in the second sphere. Compared to single-sphere designs, the two-sphere configuration improves device sensitivity by minimizing the internal sphere surface area while still effectively shielding the detector from direct illumination. This design reduces the effect of input angle, divergence, and beam shape on the measurement result by effectively shielding the photodiode without the use of a baffle or other shielding mechanism.

The integrating spheres below feature large Ø5 mm, Ø7 mm, or Ø12 mm apertures, externally SM1-threaded (1.035"-40) front connections, enhanced shielding against electromagnetic interference, and an over-temperature alert sensor. Because of the large active detector areas of these sensors, the included S120-FC fiber adapter can be used with FC/PC- or FC/APC-terminated fiber. The externally SM1-threaded adapter can be removed using a size 1 screwdriver to place components closer to the window. NIST-traceable data is stored in the sensor connector.

Thorlabs offers a recalibration service for these photodiode power sensors, which can be ordered below. See Item # CAL1 for the S140C and S142C Si sensors; Item # CAL2 for the S144C, S145C, and S146C InGaAs sensors; and Item # CAL4 for the S148C InGaAs sensor or S180C MCT sensor.

Item #^a	S140C	S142C	S144C	S145C	S146C	S148C	S180C
Sensor Image (Click the Image to Enlarge)
Aperture	Ø5 mm	Ø12 mm	Ø5 mm	Ø12 mm		Ø5 mm	Ø7 mm
Wavelength Range	350 - 1100 nm		800 - 1700 nm		900 - 1650 nm	1200 - 2500 nm	2.9 µm - 5.5 µm
Power Range	1 µW - 500 mW	1 µW - 5 W	1 µW - 500 mW	1 µW - 3 W	10 µW - 20 W	1 µW - 1 W	1 µW - 3 W
Detector Type	Si Photodiode		InGaAs Photodiode				MCT (HgCdTe) Photodiode
Linearity	±0.5%
Resolution^b	1 nW				10 nW	1 nW	10 nW
Measurement Uncertainty^c	±3% (440 - 980 nm) ±5% (350 - 439 nm) ±7% (981 - 1100 nm)		±5%
Responsivity^d (Click for Plot)	Raw Data	Raw Data	Raw Data	Raw Data	Raw Data	Raw Data	Raw Data
Integrating Sphere Material (Size)	Zenith^® PTFE (Ø1")	Zenith^® PTFE (Ø2")	Zenith^® PTFE (Ø1")	Zenith^® PTFE (Ø2")		Zenith^® PTFE (Ø1")	Gold Plating (Two Ø20 mm Spheres)
Head Temperature Measurement	NTC Thermistor 4.7 kΩ
Housing Dimensions	Ø45 mm x 30.5 mm	70 mm x 74 mm x 70 mm	Ø45 mm x 30.5 mm	70 mm x 74 mm x 70 mm		Ø45 mm x 30.5 mm	59.0 mm x 50.0 mm x 28.5 mm
Cable Length	1.5 m
Post Mounting	8-32 and M4 Taps
Aperture Thread	Included Adapter with SM1 (1.035"-40) External Thread
Compatible Fiber Adapters	S120-FC (Included) S120-APC, S120-SMA, S120-ST, S120-SC, S120-LC, and S140-BFA Bare Fiber Adapter (Not Included)
Compatible Consoles	PM400, PM100D, PM100A, and PM320E
Compatible Interfaces	PM101, PM101A, PM101R, PM101U, and PM100USB

For complete specifications, please see the Specs tab here.
Measured with PM100D console in low bandwidth setting.
Beam diameter > 1 mm
All sensor responsivities are calibrated to a NIST-traceable source with measurements taken in 5 nm intervals except for the S180C. See the S180C responsivity graph to see the NIST-traceable reference points.

Based on your currency / country selection, your order will ship from Newton, New Jersey

+1 Qty Docs Part Number - Universal Price Available

S140C Integrating Sphere Photodiode Power Sensor, Si, 350 - 1100 nm, 500 mW

$745.58

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S142C Integrating Sphere Photodiode Power Sensor, Si, 350 - 1100 nm, 5 W

$1,034.50

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S144C Integrating Sphere Photodiode Power Sensor, InGaAs, 800 - 1700 nm, 500 mW

$875.44

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S145C Integrating Sphere Photodiode Power Sensor, InGaAs, 800 - 1700 nm, 3 W

$1,074.55

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S146C Integrating Sphere Photodiode Power Sensor, InGaAs, 900 - 1650 nm, 20 W

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S148C Customer Inspired! Integrating Sphere Photodiode Power Sensor, InGaAs, 1200 - 2500 nm, 1 W

$899.24

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S180C Integrating Sphere Photodiode Power Sensor, MCT (HgCdTe), 2.9 - 5.5 µm, 3 W

$3,909.69

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Fiber Photodiode Power Sensors

Click to Enlarge
PM100D with S150C Sensor and FC Cable

For Fiber-Based Optical Power Measurements
Compact Sensor Integrated into the Connector
Integrated Design for use in the Field and Lab
Includes PM20-FC Fiber Adapter
- S150C and S151C Sensors also Include PM20-SMA Adapters
- Compatible FC/APC, LC/PC, SC/PC, and ST Fiber Adapters Also Available (See Table Below)
See the Full Web Presentation for More Information

The S15xC Compact Fiber Photodiode Power Sensor is designed to take power measurements from a wide variety of fiber coupled sources. The compact sensor, integrated into the power meter connector, features a unique integrated design housing the photodiode sensor, fiber coupling, and NIST-traceable data. Standard FC (and SMA - S150C and S151C) connectors are easily interchanged with a variety of standard fiber connectors.

Thorlabs offers a recalibration service for these photodiode power sensors, which can be ordered below (see Item # CAL1 for Si sensors and Item # CAL2 for InGaAs sensors).

Item #^a	S150C	S151C	S154C	S155C
Sensor Image (Click the Image to Enlarge)
Included Connectors	FC^b & SMA		FC^b
Wavelength Range	350 - 1100 nm	400 - 1100 nm	800 - 1700 nm
Power Range	100 pW to 5 mW (-70 dBm to +7 dBm)	1 nW to 20 mW (-60 dBm to +13 dBm)	100 pW to 3 mW (-70 dBm to +5 dBm)	1 nW to 20 mW (-60 dBm to +13 dBm)
Detector Type	Si Photodiode		InGaAs Photodiode
Linearity	±0.5%
Resolution^c	10 pW (-80 dBm)	100 pW (-70 dBm)	10 pW (-80 dBm)	100 pW (-70 dBm)
Measurement Uncertainty^d	±3% (440 - 980 nm) ±5% (350 - 439 nm) ±7% (981 - 1100 nm)	±3% (440 - 980 nm) ±5% (400 - 439 nm) ±7% (981 - 1100 nm)	±5%
Responsivity^f (Click for Details)	Raw Data	Raw Data	Raw Data	Raw Data
Coating/Diffuser	N/A	Absorptive ND (Schott NG3)	N/A
Head Temperature Measurement^e	NTC Thermistor 3 kΩ
Aperture Thread	External SM05 (0.535"-40)
Fiber Adapters	Included: PM20-FC and PM20-SMA Optional: PM20-APC, PM20-LC, PM20-SC, and PM20-ST		Included: PM20-FC Optional: PM20-APC, PM20-LC, PM20-SC, PM20-ST, and PM20-SMA
Compatible Consoles	PM400, PM100D, PM100A, and PM320E
Compatible Interfaces	PM101, PM101A, PM101R, PM101U, and PM100USB

For complete specifications, please see the Specs tab here.
Because of the large active detector area of these sensors, the included PM20-FC fiber adapter can be used with both FC/PC- and FC/APC-terminated fiber.
Measured with PM100D console in low bandwidth setting.
For a beam diameter > 1 mm incident on the active area of the detector (i.e. at the detector surface after the light has exited the fiber and passed through any internal optics).
This specification is valid for devices with serial numbers 1203xxx and higher. For older versions, please contact technical support.
All sensor responsivities are calibrated to a NIST-traceable source with measurements taken in 5 nm intervals.

High-Resolution Thermal Power Sensors

Item #^a	S401C	S405C
Sensor Image (Click the Image to Enlarge)
Wavelength Range	190 nm - 20 µm	190 nm - 20 µm
Optical Power Range	10 µW - 1 W (3 W^b)	100 µW - 5 W
Input Aperture Size	Ø10 mm	Ø10 mm
Active Detector Area	10 mm x 10 mm	10 mm x 10 mm
Max Optical Power Density	500 W/cm² (Avg.)	1.5 kW/cm² (Avg.)
Detector Type	Thermal Surface Absorber (Thermopile) with Background Compensation	Thermal Surface Absorber (Thermopile)
Linearity	±0.5%	±0.5%
Resolution^c	1 µW	5 µW
Measurement Uncertainty^d	±3% @ 1064 nm ±5% @ 190 nm - 10.6 µm	±3% @ 1064 nm ±5% @ 250 nm - 17 µm
Response Time^e	1.1 s	1.1 s
Cooling	Convection (Passive)
Housing Dimensions (Without Adapter)	33.0 m x 43.0 mm x 15.0 mm (1.30" x 1.69" x 0.59")	40.6 mm x 40.6 mm x 16.0 mm (1.60" x 1.60" x 0.63")
Temperature Sensor (In Sensor Head)	NTC Thermistor	NTC Thermistor
Cable Length	1.5 m
Post Mounting	Universal 8-32 / M4 Taps (Post Not Included)	Universal 8-32 / M4 Taps (Post Not Included)
30 mm Cage Mounting	-	Two 4-40 Tapped Holes & Two Ø6 mm Through Holes
Aperture Threads	-	Internal SM05
Accessories	Externally SM1-Threaded Adapter Light Shield with Internal SM05 Threading	Externally SM1-Threaded Adapter
Compatible Consoles	PM400, PM100D, PM100A, and PM320E
Compatible Interfaces	PM101, PM101A, PM101R, PM101U, PM102, PM102A, PM102U and PM100USB

For complete specifications, please see the Specs tab here.
For conditions of intermittent use, with a maximum exposure time of 20 minutes for the S401C. The S405C saturates for optical input powers >5 W.
Measurement taken with the legacy PM200 console for the S401C and the PM400 console for the S405C. In all cases, the acceleration circuit was switched off. Resolution performance will be similar with our other power meter consoles.
Defined as the measurement uncertainty during calibration at the specified wavelengths for a beam diameter > 1 mm. The ±3% specification was determined by laser calibration, and the ±5% specification was determined through spectral calibration, in which values were interpolated using the laser calibration data and the absorption curve for the absorber. Calibration can be performed at 10.6 µm upon request.
Typical natural response time (0 - 95%). Our power consoles can provide estimated measurements of optical power on an accelerated time scale (typically <1 s). See the Operation tab for additional information.

High Resolution of 1 μW or 5 μW
S401C and S405C Have Thermistors Used to Monitor Temperature of Sensor Head
S401C: Background Compensation for Low-Drift Measurements
S405C: Accommodates Average Optical Power Densities up to 1.5 kW/cm²
See the Full Web Presentation for More Information

Click to Enlarge
S401C Thermal Sensor with Included Light Shield

Thorlabs offers two broadband thermal power sensors designed to measure low optical power sources with high resolution. Each thermal sensor's broadband coating has a flat spectral response over a wide wavelength range, as shown in the plot below.

An aperture size of Ø10 mm allows for easy alignment and measurement of large-spot-size laser sources. For easy integration with Thorlabs' lens tube systems and SM1-threaded (1.035"-40) fiber adapters, each sensor has either external SM1 threading or includes an externally SM1-threaded adapter.

The S401C uses active thermal background compensation to provide low-drift power measurements. This is implemented through the use of two similar sensor circuits. One sensor circuit is the type all thermal power sensors share: it measures heat flow from light absorber to heat sink. The other sensor circuit monitors the ambient temperature. It is located within the housing and measures heat flow from heat sink towards the absorber. The measurements of the two sensor circuits are subtracted, which minimizes the effect of thermal drift on the laser power measurement. (For information about how the external thermal disturbances can affect thermal power sensor readings, see the Operation tab.) The broadband coating used on this thermal sensor offers high absorption at wavelengths between 0.19 and 20 µm (shown in the graph), which makes the sensor ideal for use with aligning and measuring Mid-IR Quantum Cascade Lasers (QCLs). The included, internally SM05-threaded (0.535"-40) light shield is shown in the photo to the right.

The S405C has internal SM05 (0.535"-40) threading that is directly compatible with SM05 lens tubes, and it can also connect directly to Thorlabs' 30 mm Cage Systems.

Thorlabs offers a recalibration service for these sensors, which can be ordered below (see Item # CAL-S200).

Low Power High Resolution Thermal Sensor Absorption

Click to Enlarge
The S405 shares the same absorption curve with the S415C, S425C, and S245C-L. (All are sold below.)

Thermal Sensors for Max Powers of 10 W

Item #^a	S415C	S425C
Sensor Image (Click Image to Enlarge)
Wavelength Range	190 nm - 20 µm	190 nm - 20 µm
Optical Power Range	2 mW - 10 W (20 W^b)	2 mW - 10 W (20 W^b)
Input Aperture Size	Ø15 mm	Ø25.4 mm
Active Detector Area	Ø15 mm	Ø27 mm
Max Optical Power Density	1.5 kW/cm² (Avg.)	1.5 kW/cm² (Avg.)
Detector Type	Thermal Surface Absorber (Thermopile)
Linearity	±0.5%	±0.5%
Resolution^c	100 µW	100 µW
Measurement Uncertainty^d	±3% @ 1064 nm ±5% @ 250 nm - 17 µm	±3% @ 1064 nm ±5% @ 250 nm - 17 µm
Response Time^e	0.6 s	0.6 s
Cooling	Convection (Passive)
Housing Dimensions (Without Adapter)	50.8 mm x 50.8 mm x 35.0 mm (2.00" x 2.00" x 1.38")	50.8 mm x 50.8 mm x 35.0 mm (2.00" x 2.00" x 1.38")
Temperature Sensor (In Sensor Head)	NTC Thermistor
Cable Length	1.5 m
Post Mounting	Universal 8-32 / M4 Taps (Post Not Included)	Universal 8-32 / M4 Taps (Post Not Included)
30 mm Cage Mounting	-	-
Aperture Threads	Internal SM1	Internal SM1
Removable Heatsink	Yes	Yes
Accessories	Externally SM1-Threaded Adapter	Externally SM1-Threaded Adapter
Compatible Consoles	PM400, PM100D, PM100A, and PM320E
Compatible Interfaces	PM101, PM101A, PM101R, PM101U, PM102, PM102A, PM102U and PM100USB

For complete specifications, please see the Specs tab here.
Two Minute Maximum Exposure Time
Measurement taken with the PM400 with the acceleration circuit switched off. Resolution performance will be similar with our other power meter consoles.
Defined as the measurement uncertainty during calibration at the specified wavelengths for a beam diameter > 1 mm. The ±3% specification was determined by laser calibration, and the ±5% specification was determined through spectral calibration, in which values were interpolated using the laser calibration data and the absorption curve for the absorber. Calibration can be performed at 10.6 µm upon request.
Typical natural response time (0 - 95%). Our power consoles can provide estimated measurements of optical power on an accelerated time scale (typically <1 s). As the natural response times of the S415C and S425C are fast, these do not benefit from accelerated measurements and this function cannot be enabled. See the Operation tab for additional information.

100 µW Optical Power Resolution
Thermistors Used to Monitor Temperature of Sensor Head
Removable Heat Sinks Included
See the Full Web Presentation for More Information

These thermal power sensors are designed for general broadband power measurements of low and medium power light sources. All include an externally SM1-threaded (1.035"-40) adapter, with threading concentric with the input aperture. The adapters are useful for mounting Ø1" Lens Tubes and Fiber Adapters (available below). The apertures of the S415C and S425C have internal SM1 threading.

These sensors operate with fast (<0.6 s) natural response times, and their removable heat sinks provide a high degree of flexibility to those interested in integrating them into custom setups or replacing the included heat sink with one that is water or fan cooled. If replacing the heat sink, please note that the replacement must provide heat dissipation adequate for the application.

Thorlabs offers a recalibration service for these sensors, which can be ordered below (see Item # CAL-S200).

Thermal Sensor Absorption Mid-Power Thermal

Click to Enlarge
The absorption curves of each of the thermal power sensors designed for use with low and medium power optical sources.

Thermal Sensors for Max Powers from 40 W to 200 W

Click to Enlarge
The absorption curves of each of the thermal power sensors designed for use with low and medium power optical sources.

Thermistors Used to Monitor Temperature of Sensor Head
S322C Has 4-40 Taps for Use with Our 30 mm Cage Systems
S350C Has Ø40 mm Aperture Well Suited to Excimer and Other Lasers with Large Spot Sizes
S425C-L Features Removable Heat Sink
S322C is Fan Cooled with an Optical Power Range up to 200 W
See the Full Web Presentation for More Information

These thermal power sensors are designed for general broadband power measurements of low and medium power light sources. With the exception of the S350C, all include an adapter with external SM1 (1.035"-40) threading concentric with the input aperture. This allows the sensors to be integrated into existing Ø1" lens tube systems in addition to being compatible with fiber adapters (available below). The aperture of the S425C-L has internal SM1 threading.

The S425C-L operates with a fast (<0.6 s) natural response time and has a removable heat sink, which provides a high degree of flexibility to those interested in integrating them into custom setups or replacing the included heat sink with one that is water or fan cooled. If replacing the heat sink, please note that the replacement must provide heat dissipation adequate for the application.

Thorlabs offers a recalibration service for these sensors, which can be ordered below (see Item # CAL-S200).

Item #^a	S350C	S425C-L	S322C
Sensor Image (Click Image to Enlarge)
Wavelength Range	190 nm- 1.1 µm, 10.6 µm	190 nm - 20 µm	250 nm - 11 µm
Optical Power Range	10 mW - 40 W (60 W^b)	2 mW - 50 W (75 W^b)	100 mW - 200 W (250 W^b)
Input Aperture Size	Ø40 mm	Ø25.4 mm	Ø25 mm
Active Detector Area	Ø40 mm	Ø27 mm	Ø25 mm
Max Optical Power Density	2 kW/cm² (Avg.)	1.5 kW/cm² (Avg.)	4 kW/cm² (Avg., CO₂)
Detector Type	Thermal Surface Absorber (Thermopile)
Linearity	±1%	±0.5%	±1%
Resolution^c	1 mW	100 µW	5 mW
Measurement Uncertainty^d	±3% @ 351 nm ±5% @ 190 nm - 1100 nm	±3% @ 1064 nm ±5% @ 250 nm - 17 µm	±3% @ 1064 nm ±5% @ 266 nm - 1064 nm
Response Time^e	9 s (1 s from 0 to 90%)	0.6 s	5 s (1 s from 0 to 90%)
Cooling	Convection (Passive)		Forced Air with Fan^f
Housing Dimensions (Without Adapter, if Applicable)	100 mm x 100 mm x 54.2 mm (3.94" x 3.94" x 2.13")	100.0 mm x 100.0 mm x 58.0 mm (3.94" x 3.94" x 2.28")	100 mm x 100 mm x 86.7 mm (3.94" x 3.94" x 3.41")
Temperature Sensor (In Sensor Head)	NTC Thermistor
Cable Length	1.5 m
Post Mounting	M6 Threaded Taps, Includes Ø1/2" Post, 75 mm Long	Universal 8-32 / M4 Taps (Post Not Included)	M6 Threaded Taps, Includes Ø1/2" Post, 75 mm Long
30 mm Cage Mounting	-	-	Four 4-40 Tapped Holes
Aperture Threads	-	Internal SM1	-
Removable Heatsink	-	Yes	-
Accessories	-	Externally SM1-Threaded Adapter	Externally SM1-Threaded Adapter
Compatible Consoles	PM400, PM100D, PM100A, and PM320E
Compatible Interfaces	PM101, PM101A, PM101R, PM101U, PM102, PM102A, PM102U and PM100USB

For complete specifications, please see the Specs tab here.
Two Minute Maximum Exposure Time
Measurement taken with the PM100D console, except for the S425C-L in which the PM400 was used. In all cases, the acceleration circuit was switched off. Resolution performance will be similar with our other power meter consoles.
Defined as the measurement uncertainty during calibration at the specified wavelengths for a beam diameter > 1 mm. The ±3% specification was determined by laser calibration, and the ±5% specification was determined through spectral calibration, in which values were interpolated using the laser calibration data and the absorption curve for the absorber. Calibration can be performed at 10.6 µm upon request.
Typical natural response time (0 - 95%). Our power consoles can provide estimated measurements of optical power on an accelerated time scale (typically <1 s) for the S350C and S322C. As the natural response time of the S425C-L is fast, the S425C-L does not benefit from acceleration and this function cannot be enabled. See the Operation tab for additional information.
12 VDC power supply is included.

Thermal Sensors for High Max Power Density Laser Pulses

Item #^a	S370C	S470C
Sensor Image (Click the Image to Enlarge)
Wavelength Range	400 nm - 5.2 µm	250 nm - 10.6 µm
Optical Power Range	10 mW - 10 W (15 W^b)	100 µW - 5 W (Pulsed and CW)
Input Aperture Size	Ø25 mm	Ø15 mm
Active Detector Area	Ø25 mm	Ø16 mm
Max Optical Power Density	35 W/cm² (Avg.); 100 GW/cm² (Peak)
Detector Type	Thermal Volume Absorber (Thermopile)
Linearity	±1%	±0.5%
Resolution^c	250 µW	10 µW
Measurement Uncertainty^d	±3% @ 1064 nm ±5% @ 400 nm - 1064 nm	±3% @ 1064 nm ±5% @ 250 nm - 10.6 µm
Response Time^e	45 s (3 s from 0 to 90%)	6.5 s (<2 s from 0 to 90%)
Cooling	Convection (Passive)
Housing Dimensions (Without Adapter, if Applicable)	75 mm x 75 mm x 51.2 mm (2.95" x 2.95" x 2.02")	45.0 mm x 45.0 mm x 18.0 mm (1.77" x 1.77" x 0.71")
Temperature Sensor (In Sensor Head)	N/A	N/A
Cable Length	1.5 m
Post Mounting	M6 Threaded Taps, Includes Ø1/2" Post, 75 mm Long	Universal 8-32 / M4 Tap (Post Not Included)
30 mm Cage Mounting	Four 4-40 Tapped Holes	-
Aperture Threads	-	External SM1
Accessories	Externally SM1-Threaded Adapter	-
Compatible Consoles	PM400, PM100D, PM100A, and PM320E
Compatible Interfaces	PM101, PM101A, PM101R, PM101U, PM102, PM102A, PM102U and PM100USB

For complete specifications, please see the Specs tab here.
Two Minute Maximum Exposure Time
Measurement taken with the PM100D console for the S370C and with the legacy PM200 for the S470C. In all cases, the acceleration circuit was switched off. Resolution performance will be similar with our other power meter consoles.
Defined as the measurement uncertainty during calibration at the specified wavelengths for a beam diameter > 1 mm. The ±3% specification was determined by laser calibration, and the ±5% specification was determined through spectral calibration, in which values were interpolated using the laser calibration data and the absorption curve for the absorber. Calibration can be performed at 10.6 µm upon request.
Typical natural response time (0 - 95%). Our power consoles can provide estimated measurements of optical power on an accelerated time scale (typically <2 s). See the Operation tab for additional information.

Designed for Optical Power Measurements of Nd:YAG Lasers
Ideal for Applications with High Peak Pulse Powers
S370C: Ø25 mm Aperture for Large-Spot-Size Beams
S470C: High-Sensitivity for High-Peak-Power Pulses with Low Average Power
See the Full Web Presentation for More Information

The S370C and S470C Thermal Sensors are designed to measure short and highly energetic laser pulses. All of these units are post-mountable for free-space applications and feature NIST-traceable data stored in the sensor connector.

These thermal power sensors are unique in that they have thermal volume absorbers, where our other thermal power sensors have thermal surface absorbers. The volume absorber consists of a Schott glass filter. Incident pulses are absorbed and the heat is distributed throughout the volume. In this way, pulses that would have damaged the absorption coating of a thermal surface absorber are safely measured by these thermal volume absorbers.

The S370C features a large Ø25 mm aperture ideal for large-spot-size beams, and it is compatible with average powers from 10 mW to 10 W (CW).

In comparison, the S470C is faster, as the glass absorber volume is reduced and other design parameters have been optimized for speed. This results in a different optical power range, with the ability to measure powers down to 100 µW. The Ø15 mm aperture is of the S470C is smaller, and it has a lower max average power of 5 W. Its 10 µW resolution is better than the 250 µW resolution of the S370C.

Thorlabs offers a recalibration service for these sensors, which can be ordered below (see Item # CAL-S200).

Click to Enlarge
This absorption curve is shown over a broader wavelength range than the sensors' operating ranges. See the table for the operating wavelength range of each sensor.

Thermal Position & Power Sensors

Item #^a	S440C	S442C
Sensor Image (Click the Image to Enlarge)
Wavelength Range	190 nm - 20 µm
Optical Power Range	0.5 mW - 5 W	10 mW - 50 W
Input Aperture Size	17 mm x 17 mm	Ø17.5 mm
Max Optical Power Density	1.5 kW/cm²
Detector Type	Four Thermopiles in Quadrant Configuration
Linearity	±1%
Resolution^b	50 µW	1 mW
Measurement Uncertainty^c	±5% at 1064 nm; ±7% for 250 nm - 17 µm
Position Resolution	5 µm	10 µm
Position Accuracy^d	50 µm (Ø1 mm Circle) 200 µm (Ø6 mm Circle)	100 µm (Ø1 mm Circle) 300 µm (Ø6 mm Circle)
Position Repeatability^d	15 µm (Ø1 mm Circle) 100 µm (Ø6 mm Circle)	25 µm (Ø1 mm Circle) 150 µm (Ø6 mm Circle)
Response Time^e	<1.1 s	<0.6 s
Cooling	Convection (Passive)
Housing Dimensions (Without Adapter)	40.6 mm x 40.6 mm x 8.9 mm (1.60" x 1.60" x 0.35")	100.0 m x 100.0 mm x 57.8 mm (3.94" x 3.94" x 2.28")
Temperature Sensor (In Sensor Head)	NTC Thermistor
Cable Length	1.5 m
Post Mounting	One 8-32 / M4 Universal Tap	Two 8-32 / M4 Universal Taps
30 mm Cage Mounting	Four Ø6 mm Through Holes	-
Aperture Threads	-	Internal SM1 (1.035"-40)
Accessories	-	Externally SM1-Threaded Adapter
Compatible Consoles	PM400, PM102, PM102A, and PM102U

For complete specifications, please see the Specs tab here.
Measured Using the PM400 Console with Acceleration Circuit Switched Off
Beam Diameter > 1 mm
Valid within the Specified Area at the Center of the Sensor
Typical Natural Response Time (0 - 95%)

Segmented Quadrant Position-Sensing Detector
S440C: High Sensitivity; 30 mm Cage System Compatible
S442C: High Power; Heat Sink Included
See the Full Web Presentation for More Information

The S440C and S442C position sensors use thermopiles to obtain high-resolution measurements of a beam's position and power. The detector area consists of four thermopile-based sensors arranged as quadrants of a square. The quadrants are mechanically coupled but electrically isolated; thus, heat is free to flow across the entire active area, but the signal from each quadrant measures the response in only that quadrant's thermopile. The XY position of the beam is determined by comparing the signal intensity measured for each quadrant.

The S440C detector is optimized for high sensitivity from 0.5 mW to 5 W. The housing features four Ø6 mm through holes for compatibility with 30 mm cage systems, as well as an 8-32 / M4 universal tap for post mounting. The S442C detector is compatible with higher power levels from 10 mW up to 50 W. The housing includes a heat sink for superior heat dissipation, as well as two 8-32 / M4 universal taps for post mounting.

Both detectors feature C-Series connectors which contain NIST- and PTB-traceable calibraion data. The sensors can be controlled using the PM400 power meter console or PM102 series power meter interfaces. The system can be configured to display a visual trace of the position over time, a graph of the X and Y positions over time, a table of measurement statistics, or a simple numerical readout of the incident power. See the full web presentation and the PM400 manual for details.

Click to Enlarge
Click Here for Raw Data
The wavelength range of the data in this graph is limited by the detector used during testing. The thermal position detectors are capable of operating at up to 20 µm.

Pyroelectric Energy Sensors

Click to Enlarge
ES220C Sensor Mounted in a 30 mm Cage System

For General Purpose and High Energy Optical Pulse Measurements
Black Broadband Coating with Flat Response Over a Wide Wavelength Range
Ceramic Coating with High Damage Thresholds for High-Energy-Density Lasers
Sensor Areas from Ø11 mm to Ø45 mm
BNC Connector for Oscilloscope Use
C-Series Connector Adapter for Use with Compatible Thorlabs Consoles and Interfaces (See Table Below)
See the Full Web Presentation for More Information

These Pyroelectric Sensors are designed to measure pulsed coherent and incoherent sources. Pyroelectric sensors are not suited for CW measurements, as they convert energy from light pulses into voltage pulses. A black broadband or ceramic coating is used for low or high power measurements, respectively. Large sensor areas from
Ø11 mm - Ø45 mm allow easy alignment. The energy sensors features BNC connectors for use with an oscilloscope, as well as standard power meter connectors which contain NIST and PTB-traceable calibration data.

These sensors are not compatible with the PM100A Analog Power Meter Console or the PM101 Series Power Meter Interfaces.

Thorlabs offers a recalibration service for these energy sensors, which can be ordered below (see Item # CAL-S200).

Item #^a	ES111C	ES120C	ES145C	ES220C	ES245C
Sensor Image (Click the Image to Enlarge)
Aperture Size	Ø11 mm	Ø20 mm	Ø45 mm	Ø20 mm	Ø45 mm
Wavelength Range	0.185 - 25 µm
Energy Range	10 µJ - 150 mJ	100 µJ - 500 mJ	500 µJ - 2 J	500 µJ - 3 J	1 mJ - 15 J
Detector Type	Pyroelectric Energy Sensor with Black Broadband Coating			Pyroelectric Energy Sensor with Ceramic Coating
Resolution	100 nJ	1 µJ	1 µJ	25 µJ	50 µJ
Linearity	±1%
Measurement Uncertainty	±5% @ 0.185 - 25 µm
Housing Dimensions	Ø36 mm x 16 mm	Ø50 mm x 18 mm	Ø75 mm x 21 mm	Ø50 mm x 18 mm	Ø75 mm x 21 mm
Cable Length	1.5 m
Post Mounting	8-32 Mounting Thread, 8-32 and M4 Insulating Adapters Included
Cage Mounting	N/A	Four 4-40 Taps for 30 mm Cage Systems	N/A	Four 4-40 Taps for 30 mm Cage Systems	N/A
Compatible Consoles	PM400, PM100D, and PM320E
Compatible Interfaces	PM100USB

For complete specifications, please see the Specs tab here.

Recalibration Service for Photodiode Power Sensors

Calibration Service Item #	Compatible Sensors
CAL1	S120VC, S120C, S121C, S170C, S140C, S142C, S150C, S151C
CAL2	S122C, S144C, S145C, S146C, S154C, S155C
CAL-S130	S130VC, S130C
CAL-S132	S132C
CAL4	S148C, S180C

Thorlabs offers calibration services for our photodiode optical power sensors and consoles. To ensure accurate measurements, we recommend recalibrating the sensors annually. Recalibration of the console is included with the recalibration of a sensor at no additional cost. If you wish to recalibrate only your power meter console, please contact Tech Support for details.

Refer to the table to the right for the appropriate calibration service Item # that corresponds to your power meter sensor. Once the appropriate Item # is selected, enter the Part # and Serial # of the sensor that requires recalibration prior to selecting Add to Cart.

Recalibration Service for Thermal Power and Pyroelectric Energy Sensors

Sensor Type	Sensor Item #s
Thermal Power	S175C, S302C^a, S305C^a, S310C^a, S314C^a, S322C, S350C, S370C, S401C, S405C, S415C, S425C, S425C-L, S470C
Pyroelectric Energy	ES111C, ES120C, ES145C, ES220C, ES245C

This former catalog item is now offered as a special.

Thorlabs offers recalibration services for our thermal power and pyroelectric energy sensors. To ensure accurate measurements, we recommend recalibrating the sensors annually. Recalibration of the console is included with the recalibration of a sensor at no additional cost. If you wish to recalibrate only your power meter console, please contact Tech Support for details.

The table to the right lists the sensors for which this calibration service is available. Please enter the Part # and Serial # of the sensor that requires recalibration prior to selecting Add to Cart.

Please Note: To ensure your item being returned for calibration is routed appropriately once it arrives at our facility, please do not ship it prior to being provided an RMA Number and return instructions by a member of our team. Pyroelectric energy sensors returned for recalibration or servicing must include the separate BNC to DB9 adapter, which contains the sensor EEPROM.

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Handheld Optical Power and Energy Meter Console with Multi-Touch Technology

Features

Touchscreen Power Meter Front Panel

The Touchscreen Display

Numerical Display

Simulated Analog Needle

Graph View

Statistics Display

Spectral Correction

Attenuation Correction

Main Menu

Capture Settings

Sensor Measurement Settings

Temperature Sensor Settings

Laser Calculator and Unit Converter

Position Trace Display (Thermal Position Sensors Only)

Position Graph Display (Thermal Position Sensors Only)

Optical Sensor Head Input

Auxiliary Connector

Mini-B USB 2.0 Port

Analog Output

Temperature Sensor Input

Included Components

Compatible Power Meters

Optical Power Monitor

Optical Power Monitor GUI Software for Touchscreen, Handheld, and USB-Interface Power Meters

Features

Power and Energy Sensor Selection Guide

Sensor Options(Arranged by Wavelength Range)

Sensor Options(Arranged by Power Range)

Consoles

Interfaces

Touchscreen Power and Energy Meter Console with Multi-Touch Technology

Standard Photodiode Power Sensors

Slim Photodiode Power Sensors

Microscope Slide Photodiode Power Sensor

Microscope Slide Thermal Power Sensor

Integrating Sphere Photodiode Power Sensors

Fiber Photodiode Power Sensors

High-Resolution Thermal Power Sensors

Thermal Sensors for Max Powers of 10 W

Thermal Sensors for Max Powers from 40 W to 200 W

Thermal Sensors for High Max Power Density Laser Pulses

Thermal Position & Power Sensors

Pyroelectric Energy Sensors

Recalibration Service for Photodiode Power Sensors

Recalibration Service for Thermal Power and Pyroelectric Energy Sensors

Sensor Options
(Arranged by Wavelength Range)

Sensor Options
(Arranged by Power Range)