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Analog Handheld Laser Power Meter Console


  • Power Meter for Laser Tuning Applications
  • Compatible with Over 20 Photodiode and Thermal Sensors
  • Digital and Analog Output

PM100A

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Item # PM100A
Compatible Sensors Photodiode and Thermal
Optical Power Rangea 100 pW to 200 W
Available Sensor Wavelength Rangea 185 nm - 25 μm
Display Refresh Rate 20 Hz
Bandwidtha DC - 100 kHz
Photodiode Sensor Rangeb 50 nA - 5 mA
Thermopile Sensor Rangeb 1 mV - 1 V
  • Sensor Dependent
  • Ranges Selectable in Watts (Photodiode and Thermopile) and is dependent on the sensor used.

Features

  • Combined Analog and Digital Power Meter Console
  • Designed for Coherent and Incoherent Light Source Measurements
  • Power Measurements for CW and Pulsed Source Detection
  • Fast Mechanical Needle Display with 3 Scales
  • Bright Graphics LCD Display with Different LCD Screens
    • Numerical Display for Absolute Power Readouts
    • Relative Measurement Screen for Power Tuning
    • Statistics Screen with Display Hold
    • Different Setup Screens for Configuration
  • Versatile Functionality with Easy Handling:
    • Min/Max Function
    • Acoustic Tuning Sound with Max Hold Function
    • Delta Mode Function
    • Smart Sensor Connector for Quick Sensor Exchange
  • USB 2.0 Interface
  • Analog Output
  • Sensor Upgrade and Recalibration Services Available
  • Optical Power Monitor PC Software Available (See Software Tab for Details)

The PM100A power meter console is the analog counterpart to the PM100D digital power and energy meter. It offers top performance and reliability in a compact and portable console. The PM100A is ideal for use as a CW and pulsed laser power meter, incoherent optical source power meter, general light power meter, fiber power meter, and more. Depending on the connected sensor, it can measure optical power in the range from 100 pW to 200 W. The display on the PM100A features adjustable brightness settings, with the option to turn off the backlight completely while still being readable.

The PM100A is compatible with more than 20 photodiode, slim photodiode, integrating sphere, fiber, and thermal sensors designed for use from the UV to the Mid-IR. See the Sensor Selection tab for further information. When used together with a sensor from the compact S15xC Series of fiber sensors, the PM100A becomes a compact and portable fiber power meter that is ideal for field applications as well as in the lab.Thorlabs offers a variety of Power Meter Kits which include some of our most popular sensors bundled with the PM100A and PM100D consoles. Additionally it allows the connection of unamplified anode grounded photodiodes with up to 5 mA photocurrent and thermal elements with up to 1 V output voltage.

The PM100A is also available as a kit, bundled with our most popular sensors. Please visit our power meter kits page for more info. If you have any questions regarding these kits, or would like to suggest other kit options, please contact our Tech Support department for more details.

Intelligent Sensor Connection
Click to Enlarge

Thorlabs' C-Series Power Meter Sensor Connectors Include the Sensor Calibration Data

Console Design
The compact housing has a large analog needle display with three printed scales and front panel backlit button controls. In addition, the PM100A features a bright LCD screen that displays four different digital readouts: absolute power, relative power, statistics, and a configuration menu. Audio tuning is also featured.

A selectable bandwidth of either 20 Hz or 100 kHz offers more flexibility and adaptability to specific measurement tasks while using photodiode sensors. The higher bandwidth is optimal for pulse-detection; the lower bandwidth offers lower noise and better accuracy. Additionally, the power meter can adapt to the thermal time constant of thermal sensors leading to significantly faster measurements with thermal sensors. Thermal sensors have an individual time constant that can vary greatly from unit to unit. The PM100A now can adjust to this individual constant for each sensor and thus minimize the response time of the system (sensor + console).

Connectivity
The sensor connector, shown to the right, enables "hot-swappable" quick sensor exchange and contains all the sensor information including NIST-traceable responsivity curves, sensor types, and model number.

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.

In addition to remote control operation and data logging/recording, the USB connection can also act as the charging system for the Li-Polymer battery. Also included is an AC battery charger which uses an intelligent charging management system to improve battery lifetime and reduce battery memory effects.

Recalibration Service
Recalibration services are available for our thermal and photodiode power sensors and consoles. We recommend 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 service Item # that corresponds to your sensor. To order this service for only your console, please contact Tech Support.

Sensor Upgrade Service
Thorlabs' Sensors and PM100A Console 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 PM100A. Please contact our Tech Support team for details.

Item # PM100A
Display
Display Type Mechanical Analog Needle with
Graphical LCD 132 x 32 pixels
Display Screens Numerical, Relative Measurements, Tuning,
Statistics, Mechanical Analog Needle
Viewing Area 48.2 mm x 13.2 mm and 90.0 mm x 42.0 mm
Refresh Rate 20 Hz
Backlit Display and Keypad LED
Audio Speaker
Sensor Interface
Compatible Sensors All Photodiodes, and Thermopiles
See Below for Full Sensor Compatibility Specs
Time Constant Correction 1 - 30 s
AD Converter 16 bit
Connector DB9F, Left Side
Sensor Temperature Control Thermistor
Temperature Measurement Range -10 to 80 °C
Analog Outputs
Signal Amplified Input Signal (Not Corrected)
Voltage Range 0 to 2 V
Accuracy ±3%
Bandwidth Up to 100 kHz, Dependent on Sensor and Settings
Connector SMA, Left Side
Digital Outputs
Connector / Interface Mini USB, USB2.0
Power
Battery LiPolymer 3.7 V 1300 mAh
Charger / DC Input 5 V / 1 A
Dimensions and Mounting
Dimensions (LxWxH) 183 mm x 109 mm x 40 mm
Weight <0.5 kg
Mounting Options Kickstand; 1/4"-20 Post Thread
Operating Temperature 0 to 40 °C
Storage Temperature -40 to 70 °C

Sensor Compatibility Specs

Item # PM100A
Detector Compatibility Photodiode Sensors: S1xxC Series
Photodiodes (Max 5 mA)
Thermal Sensors: S3xxC Series
Thermopiles (Max 1V)
Measurement Ranges 6 Decades; 50 nA - 5 mA
Ranges Selectable in W,
Sensor Dependent
4 Decades; 1 mV - 1 V
Ranges Selectable in W,
Sensor Dependent
Wavelength Ranges 200 nm - 5500 nm 190 nm - 25 μm
Power / Energy Ranges 100 pW - 20 W 10 μW - 200 W
Units W, dBm, W/cm², A W, dBm, W/cm², V
Accuracy ±0.2% of Full Scale (5 µA - 5 mA)
±0.5% of Full Scale (50 nA)
±0.5% of Full Scale (10 mV - 1 V)
±1% of Full Scale (1 mV)
Display Resolution 1 pA / Responsivity Value (A/W) 1 µV / Responsivity Value (V/W)
Bandwidth DC - 100 kHz, Dependent on Sensor and Settings DC - 10 Hz, Dependent on Sensor and Settings
Wavelength Correction Sensor Dependent Sensor Dependent

For a full list of the sensor head specifications please visit the Photodiode Power Sensors and Thermal Power Sensors pages. For other information, please contact tech support.

PM100A Display
Standard Absolute MeasurementsRelative Measurements
 Standard Absolute Measurements Relative Measurements
This display shows the current absolute power values on both the mechanical needle and the LCD display.Shows positive or negative power deviation from an initially zeroed position (needle in middle position). The offset and the absolute power value will be displayed in two sub displays in negative presentation.
Power Tuning with Sound SupportStatistics Screen
 Power Tuning with Sound Support  Statistics Screen
This display shows the maximum reached power level.
The level can be reset to the actual power level.
A display showing the current, min, max, and average power.
All items can be reset to restart data sampling.
Wavelength Setting 
 Wavelength Setting 
Configuration screen to set the wavelength of the incident beam. Easy switching between 9 user preconfigurable wavelengths. 

PM100A Sensor Connectors

D-type Female

DB9 Female

PinConnection
1 +5 V (Drive max 50 mA from this pin)
2 EEPROM Digital I/O
3 Photodiode Ground (Anode), Thermal and Pyro Sensor Ground, Analog Ground
4 Photodiode Cathode
5 Pyro-Electric Sensor +
6 DGND
7 PRESENT (Connect this pin via a 1kΩ - 10kΩ resistor to Pin 3 (AGND))
8 Thermal Sensor +
9 N.C.

Analog Output

SMA Female

 

SMA Female

0 ... 2 V

Computer Connection

USB Type Mini-B

USB Type Mini B

USB Type Mini-B to Type A Cable Included

Standard Photodiode Sensor Mounting Options

Thorlabs Standard Photosdiode Sensors compact design allows easy integration into existing setups. Typical mounting configurations including post, cage, and lens tube options are available. Shown on this page are several different choices for mounting these sensors.

The Standard Photodiode Sensors are compatible with all S120-xx Series fiber adapters. FC/PC and SMA adapters are shown on the right. Adapters for SC, LC, and ST connections are also available.

Flip up mounts are convenient for quick power measurments from a static location. The sensor can be placed in the path of the laser beam for the power measurment and flipped down during normal operation of the system.

FM90 Right Angle Flip-Mounts are shown to the right. Thorlabs also offers the TRB1 Articulating Post Mount. The lockable articulating mount offers almost unlimited positioning of the sensor head. The articulating mount is shown on an S13xC Slim Photodiode Sensor below.

The Standard Photodiode Sensors also feature SM1 threaded connections on the front face. The SM1 theading provides easy mounting to 1" lens tube systems and quick release mounts.

Shown to the right are the KB1P Quick-Release Post Mount and QRC1A Quick-Release 30 mm Cage Mount. Both mounts feature SM1 threaded connections to the sensor heads.

Note: Due to the thickness of the S12xC sensor, the QRC1A and CP90F (shown below) quick release mounts can only be fully removed from the cage system by backing them off an open end. The two mounts are easily removed from the cage system if only three cage mounts are used. See the picture on the right.

Thorlabs also offers the CP90F 30 mm Cage Plates with Quick-Release Mounts. These mounts feature magnetically coupled mounting for easy and repeatable mounting.

Note: Like the QRC1A, the CP90F can not be removed from a closed cage system.

Slim Photodiode Sensor Mounting Options

Thorlabs' Slim Photodiode Sensors are designed to fit into tight optic arrangements such as cages, lens tubs, and optic dense free space arrangements.

Shown to the right is a S130C Sensor inserted into a 30 mm cage system. The application shown highlights the ease for which the sensor can be inserted into the cage, and the minimal space needed to take a power measurment.

The Slim Photodiode Sensors may also be mounted on a TRB1 Articulating Mount. This mount allows repeatable insertion of the sensor into tight optic arrangements. After the measurement is made, the sensor may be rotated out of the beam path for normal operation.

Integrating Sphere Photodiode Sensor Mounting Options

Thorlabs' Integrating Sphere Photodiode Sensor provides a low loss cavity for diverging, non-uniform, or off-axis beam measurements. These integrating spheres are ideal for all fiber based applications due to the beam divergence at the end of the fiber.

Shown to the right is an S140C Integrating Sphere with S120-FC Fiber Adapter. Also shown is an S140C with a S140-BFA Bare Fiber Adapter. The Bare Fiber adapter features a mounting clamp and light shield to decrease interference from ambient light.

Compact Fiber Photodiode Sensor Mounting Options

Thorlabs' Compact Fiber Photodiodes are the ideal choice for a portable, fiber coupled power meter. The S15xC sensors are compatible with a wide variety of fiber connections. PM20-xx adapters are available to couple FC, PC, SC, LC, SMA, and ST connectors with the sensors. Shown to the right is a S150C Sensor with FC and SMA connector adapters.

Shown to the far right is a PM100D console with S150C sensor connected to a FC connectorized optical fiber. This setup is ideal for portable in the lab and in the field use.

Compatible Power Meters

  • PM100A Analog Power and Energy Meter Console
  • PM100D Digital Power and Energy Meter Console
  • PM100USB USB Interface Digital Power Meter
  • PM200 Touchscreen Power and Energy Meter Console
  • 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.

Software Download

Optical Power Meter Utility
Click to Enlarge

Measurement Mode: Set up and configure up to eight power meters.
Optical Power Meter Utility
Click to Enlarge

Tuning Mode: Simulated analog needle and digital measurement value provided. Delta Mode, enabled above, shows the fluctuation range during the measurement period.
Optical Power Meter Utility
Click to Enlarge

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.
Optical Power Meter Utility
Click to Enlarge

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. 

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
  • 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 or Bluetooth® wireless technologya. 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.

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, Visual C++, Visual C#, and Visual Basic 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.

Handheld Power Meter with iPad
Click to Enlarge

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. Our photodiode and thermal sensors are compatible with all of Thorlabs' current line of power meter consoles, while our pyroelectric sensors are compatible with all of our current power meter consoles except for the PM100A Analog Power Meter Console. 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 three 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.
  • 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.

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
Pyroelectric Power Sensors (Not Compatible with PM100A)
  • 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)


Posted Comments:
dmytro.toptunov  (posted 2018-12-04 14:53:40.12)
Hello, We are looking for power meter to measure the average power output of the pulsed laser (tunable 750-1050 nm, 80 MHz rep. rate and 2.5W max average output power). Am I correct that any of the S415C/S425C or S470C sensors with the appropriate console should work for us? Another question: should we order calibration service together with the device, or it will come pre-calibrated? Best regards, Dmytro
swick  (posted 2018-12-11 03:53:19.0)
This is a response from Sebastian at Thorlabs. Thank you for the inquiry. Without information about beam diameter and pulse width it is not possible to answer this question. The damage thresholds of the sensors need to be bigger than the energy density, average power density and peak power density from your laser system. All our power meter sensors will be delivered pre-calibrated.
ivanchenkocathrine  (posted 2018-10-24 08:58:53.413)
hello. Is it possible to use S305C with PM 100A? Thanks
swick  (posted 2018-10-29 04:55:46.0)
This is a response from Sebastian at Thorlabs. Thank you for the inquiry. The S305C and PM100A are compatible.
matthieu.viteau  (posted 2018-10-01 13:14:01.003)
Hi, We have change our console to the old PM30 console and we realize we can't let the auto range, and is really annoying specially when we have a large power range (like fibre coupling optimisation). It's a way to solve this problem ? Thanks
nreusch  (posted 2018-10-03 06:54:37.0)
This is a response from Nicola at Thorlabs. Thank you very much for your inquiry. To use the PM30 auto-range feature, you need to set the main function switch to "P" and press the multi control switch. Turning the multi control switch allows you to set the range manually. I will contact you directly to check whether you need further assistance.
arcanbe  (posted 2016-06-17 21:41:17.57)
Hi, I am having troubles when using the Optical Oper Meter Utility. The software does not detect my instrument. I have a PM100A. I am using windows 10 in my computer. I specifically trid with the 5.4 and 4.9 versions.
shallwig  (posted 2016-06-20 11:21:57.0)
This is a response from Stefan at Thorlabs. Thank you for your inquiry. I have contacted you directly to troubleshoot this.
daniel.arnaldo  (posted 2015-09-23 17:47:30.327)
Hi there, is there a sensor, compatible with the PM100,capable of measuring average power of a laser source delivering short laser pulses of a few tens of ps, at several tens of Watts of average power? Thanks!
shallwig  (posted 2015-09-24 06:14:14.0)
This is a response from Stefan at Thorlabs. Thank you very much for your inquiry. For measuring the average power of pulsed lasers with short pulse lengths thermal sensors are the best choice. The peak power has to be lower than the damage threshold of the sensor. An overview of the thermal heads for the different power ranges can be found on our website here: http://www.thorlabs.de/newgrouppage9.cfm?objectgroup_id=3333 For the obsolete PM100 power meters we can offer these sensors with A connector configuration as specials. I will contact you directly to check your laser parameters in detail and which sensor is suited best.
thomas.dreischer  (posted 2013-10-31 09:37:21.817)
please can you provide a table or a curve that shows the effective bandwidth of the analog output for various optical power levels such as 1nW, 10nW, 100nW, 1uW, 10uW, 100uW, 1mW? It would be useful to have such a bandwidth data in table or curve format available in the general spec sheet. Thank you in advance!
tschalk  (posted 2013-10-31 05:35:00.0)
This is a response from Thomas at Thorlabs. Thank you very much for your inquiry. In the manual of the PM100A (http://www.thorlabs.com/thorcat/17600/PM100A-Manual.pdf) a table is provided which shows the analog output bandwidth for the different current ranges. This table can be found in section 7.3 Technical data. I will contact you directly with more detailed information.
tschalk  (posted 2013-01-11 10:19:00.0)
This is a response from Thomas at Thorlabs. Thank you very much for your inquiry. Thorlabs does offer replacement batteries and we will contact you directly with more detailed information.
philip.starkey  (posted 2013-01-08 11:16:50.533)
Hi Thorlabs, The battery in our (now pretty old) PM100A doesn't appear to charge any more. Would you consider selling replacement batteries? (I know they need to be soldered, which we are happy to do) If you won't sell them, could you point us in the direction of buying a 3rd party one? Thanks!
tcohen  (posted 2012-05-25 09:54:00.0)
Response from Tim at Thorlabs: Thank you for sharing your feedback. We will contact you directly to find out more information and diagnose the problem.
cho  (posted 2012-05-25 05:45:16.0)
Dear Sir or Madam We have a problem regarding the Thorlabs PM100A power meter: If we change the measurement range of the Thorlabs power meter the displayed power changes severe (although the optical power stays the same). I am looking forward to your answer. Kind regards
jvigroux  (posted 2011-10-19 13:00:00.0)
a response form Julien at Thorlabs: Dear Robert, thank you for your feedback. the minimum bandwidth setting is 10Hz. when using this bandwidth setting, the data will be averaged over 1000 values coming form the AD converter. I will contact you directly in order to discuss your application and see which approach (software or hardware) would be the best for you.
robert.carlson  (posted 2011-10-18 14:13:31.0)
Regarding the PM100A power meter, is there a user-selectable bandwidth that can be adjusted I have a case where the power fluctuates, and I want as long a time constant as possible is desirable (i.e., minimum bandwidth). What is the minimum BW possible? (Sensor being considered is integrating sphere S144C. The S302C thermopiles have a slow response, as desired, but are not sufficiently sensitive.) Thanks!
jvigroux  (posted 2011-03-11 10:16:00.0)
A response from Julien at Thorlabs: Dear Jeremy, the driver contains a function called PM100D_startDarkAdjust that performs a dark current adjustment. In order to perform this procedure, you of course need to ensure that the sensor is properly darkened. During the procedure, the state can always be asked through the function PM100D_getDarkAdjustState. The value of the offset can, once this procedure is over, be read out with the function PM100D_getDarkOffset. the description of those functions can be found in ethe programmer's reference manual that is installed with the driver. The default installation path is C:\Program Files\IVI Foundation\VISA\WinNT\PM100D_Drv\manual\PM100D_Drv.html
jeremy.tsiang  (posted 2011-03-10 09:45:27.0)
Hi there, I am trying to find a software command to ZERO the PM100A I have. Our building is quite old, and the temperature in the lab is inconsistent at best, so we can have a 5 degree difference between days and way more between seasons. I have read through every command in the driver but cant find one that does what Im looking for. I just want a software command equivalent to selecting the ZERO function. Does this exist? Thanks for your help. Jeremy Tsiang

Thorlabs offers a wide selection of power and energy meter consoles, ranging from the touch screen PM400 to the analog PM100A. Key specifications of all of our power meter consoles are presented below to help you decide which device is best for your application. We also offer self-contained wireless power meters.

When used with our C-series sensors, Thorlabs' power meter consoles 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 sensors are also capable of displaying the current or voltage delivered by the sensor. Alternatively, a current or voltage equivalent to the measured value is provided at the analog output.

Item # PM100A PM100D PM100USB PM200 PM400 PM320E
(Click Photo to Enlarge) PM100A PM100D PM100USB PM200 PM400 PM320E
Description Analog Power Meter Console Digital Power and Energy Meter Console USB Power and Energy Meter Interface Touchscreen Power and Energy Meter Console Touchscreen Power and Energy Meter Console with Multi-Touch Dual-Channel Benchtop Power and Energy Meter Console
Compatible Sensors Photodiode and Thermal Photodiode, Thermal, and 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)
3.67" x 2.38 " x 1.13"
(93.1 mm x 60.4 mm x 28.7 mm)
6.70" x 4.93" x 1.48"
(170.2 mm x 125.1 mm x 37.5 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 4, Programmable -
Source Spectral Correction - - - Yes! Yes! -
Attenuation Correction - - - Yes! Yes! -
External Trigger Input - - -  yes -  yes
Display
Type Mechanical Needle and LCD Display with Digital Readout 320 x 240 Pixel Backlit Graphical LCD Display No Built-In Display
Controlled via GUI for PC
Resistive Touchscreen with Color 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)
- 4.65" x 3.48"
(118.0 mm x 88.5 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 Dependent on PC and Settingsa 100 Hz 10 Hz (Numerical)
25 Hz (Analog Simulation)
20 Hz
Measurement Viewsb
Numerical yes yes Requires PCc yes yes
Mechanical Analog Needle yes - - - - -
Simulated Analog Needle - yes Requires PCc yes Yes! yes
Bar Graph - yes Requires PCc yes Yes! yes
Trend Graph - yes Requires PCc yes Yes! Yes!
Histogram - yes Requires PCc - - Yes!
Statistics Yes! yes Requires PCc yes Yes! yes
Memory
Type - SD Card - NAND Flash NAND Flash -
Size - 2 GB - 128 MB 4 GB -
Power
Battery LiPo 3.7 V 1300 mAh - LiPo 3.7 V 2600 mAh LiPo 3.7 V 2600 mAh -
External 5 VDC via USB or Included AC Adapter 5 VDC via USB 5 VDC via Included Power Supply 5 VDC via USB Selectable Line Voltage: 100 V, 115 V, 230 V (±10%)
  • Up to 300 Hz. The refresh rate is limited by the PC used to operate the PM100USB power meter interface, as it does not have a built in display.
  • 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.
  • The PM100USB power meter interface does not have a built-in monitor, so all data must be displayed through a PC running the Optical Power Meter Software.

Analog Handheld Laser Power Meter Console

  • Compact, Handheld, Analog Needle, Power Meter Console
  • Digital Display Screen
  • Long-Life Internal Li-Polymer Battery
  • Console comes Calibrated with Certificate of Calibration
  • 1 GB USB Memory Stick with Software including LabVIEW™ and LabWINDOWS™ /CVI Driver Set, and Operating Manual
  • Hard Case to Store the Console and one Sensor

Please note that sensors are not included with the PM100A console. For information about our compatible sensors, please see the sensor descriptions below. Thorlabs does offer a variety of Power Meter Kits with the PM100A Console bundled with several of our most popular sensors. Please visit our Power Meter Kits page for more details.

A recalibration service is available for the PM100A; contact Tech Support for details. Alternatively, if you have a corresponding sensor that needs recalibrating, you can include the PM100A 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.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
PM100A Support Documentation
PM100ACompact Power Meter Console, Mechanical Analog & Graphical LC Display
$943.50
Today

Standard Photodiode Power Sensors

S120C and quick release 30mm Cage System
Click to Enlarge
S120C and CP90F 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)

S120VC

S120C

S121C

S122C

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%
Resolutionb 1 nW 10 nW 2 nW
Measurement Uncertaintyc ±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%
Responsivityd (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 Mountinge,f,g Universal 8-32 / M4 Tap, Post Not Included
Aperture Thread External SM1 (1.035"-40)
Compatible Fiber Adapters S120-FC, S120-SMA, S120-ST, S120-LC, and S120-SC (Not Included)
Compatible Consoles PM400, PM200, PM100D, PM100A, PM100USB, and PM320E
  • 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.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
S120VC Support Documentation
S120VCStandard Photodiode Power Sensor, Si, 200 - 1100 nm, 50 mW
$424.32
Today
S120C Support Documentation
S120CStandard Photodiode Power Sensor, Si, 400 - 1100 nm, 50 mW
$306.00
Today
S121C Support Documentation
S121CStandard Photodiode Power Sensor, Si, 400 - 1100 nm, 500 mW
$332.52
5-8 Days
S122C Support Documentation
S122CStandard Photodiode Power Sensor, Ge, 700 - 1800 nm, 40 mW
$610.98
Today

Slim Photodiode Power Sensors


Click to Enlarge
View Imperial Product List
Item #QtyDescription
Imperial Product List
S130C1Slim Photodiode Power Sensor, Si, 400 - 1100 nm, 500 mW
CP022SM1-Threaded 30 mm Cage Plate, 0.35" Thick, 2 Retaining Rings, 8-32 Tap
TR61Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 6"
ER6-P43Cage Assembly Rod, 6" Long, Ø6 mm, 4 Pack
CM1-BS013130 mm Cage Cube-Mounted Non-Polarizing Beamsplitter, 400 - 700 nm, 8-32 and M4 Adapters
View Metric Product List
Item #QtyDescription
Metric Product List
S130C1Slim Photodiode Power Sensor, Si, 400 - 1100 nm, 500 mW
CP02/M2SM1-Threaded 30 mm Cage Plate, 0.35" Thick, 2 Retaining Rings, M4 Tap
TR150/M1Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 150 mm
ER6-P43Cage Assembly Rod, 6" Long, Ø6 mm, 4 Pack
CM1-BS013130 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 #QtyDescription
Universal Product List
S130C1Slim Photodiode Power Sensor, Si, 400 - 1100 nm, 500 mW
FB-511Single-Axis FiberBench, L = 51 mm, 5 Positions
FBSM1FiberBench Mount for Slim Photodiode Sensors
HCA3-SM11FiberBench Wall Plate, FiberPort Compatible, Internally SM1-Threaded
PAF-X-5-B1FiberPort, FC/PC & FC/APC, f=4.6 mm, 600 - 1050 nm, Ø1.00 mm Waist
FBR-LPVIS1Rotating 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)

S130VC

S130C

S132C

Aperture Size Ø9.5 mm
Wavelength Range 200 - 1100 nm 400 - 1100 nm 700 - 1800 nmb
Power Range
(with Filter)
500 pW - 0.5 mWc
(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 pWd 1 nWe
Measurement Uncertaintyf ±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%
Responsivityg (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-SMA, S120-ST, S120-LC, and S120-SC
FBSM: Integrate Sensor into FiberBench Setups
Compatible Consoles PM400, PM200, PM100D, PM100USB, PM100A, and PM320E
  • 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.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
S130VC Support Documentation
S130VCSlim Photodiode Power Sensor, Si, 200 - 1100 nm, 50 mW
$616.08
5-8 Days
S130C Support Documentation
S130CSlim Photodiode Power Sensor, Si, 400 - 1100 nm, 500 mW
$508.98
Today
S132C Support Documentation
S132CSlim Photodiode Power Sensor, Ge, 700 - 1800 nm, 500 mW
$723.18
Today
SM1A29 Support Documentation
SM1A29Customer Inspired! SM1 Thread Adapter for Slim Photodiode Sensors
$42.08
Today
FBSM Support Documentation
FBSMFiberBench Mount for Slim Photodiode Sensors
$41.82
Today

Microscope Slide Photodiode Power Sensor

Item #a S170C
Sensor Image
(Click Image to Enlarge)
S170C Microscope Slide Power Head
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%
Resolutionb 1 nW
Calibration Uncertaintyc ±3% (440 - 980 nm)
±5% (350 - 439 nm)
±7% (981 - 1100 nm)
Responsivityd (Click for Plot) Typical Responsivity
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, PM200, PM100D,
PM100USB, PM100A, and PM320E
  • 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.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
S170C Support Documentation
S170CCustomer Inspired! Microscope Slide Power Sensor, 350 - 1100 nm, 150 mW
$1,137.30
Today

Microscope Slide Thermal Power Sensor

Item #a S175C
Sensor Image
(Click Image to Enlarge)
Microscope Thermal Sensor
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%
Resolutionb 10 µW
Measurement Uncertaintyc ±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, PM200, PM100D, PM100USB, PM100A, and PM320E
  • For complete specifications, please see the Specs tab here.
  • Measured with 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.
Microscope Thermal Sensor
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.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
S175C Support Documentation
S175CCustomer Inspired! Microscope Slide Thermal Power Sensor, 300 nm - 10.6 µm, 2 W
$1,137.30
Today

Integrating Sphere Photodiode Power Sensors

S142C and S140-BFA Bare Fiber Adapter
Click to Enlarge
S142C and S140-BFA Bare Fiber Adapter (Sold Separately)
S142C and S120-FC Fiber Adapter
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)
S140C S142C S144C S145C S146C S144C Mid-IR Detector
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%
Resolutionb 1 nW 10 nW 1 nW 10 nW
Measurement
Uncertaintyc
±3% (440 - 980 nm)
±5% (350 - 439 nm)
±7% (981 - 1100 nm)
±5%
Responsivityd
(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-SMA, S120-ST, S120-SC, S120-LC, and S140-BFA Bare Fiber Adapter (Not Included)
Compatible Consoles PM400, PM200, PM100D, PM100USB, PM100A, and PM320E
  • 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 Support Documentation
S140CIntegrating Sphere Photodiode Power Sensor, Si, 350 - 1100 nm, 500 mW
$702.78
Today
S142C Support Documentation
S142CIntegrating Sphere Photodiode Power Sensor, Si, 350 - 1100 nm, 5 W
$975.12
Today
S144C Support Documentation
S144CIntegrating Sphere Photodiode Power Sensor, InGaAs, 800 - 1700 nm, 500 mW
$825.18
Today
S145C Support Documentation
S145CIntegrating Sphere Photodiode Power Sensor, InGaAs, 800 - 1700 nm, 3 W
$1,012.86
Today
S146C Support Documentation
S146CIntegrating Sphere Photodiode Power Sensor, InGaAs, 900 - 1650 nm, 20 W
$1,012.86
Today
S148C Support Documentation
S148CCustomer Inspired! Integrating Sphere Photodiode Power Sensor, InGaAs, 1200 - 2500 nm, 1 W
$847.62
Today
S180C Support Documentation
S180CIntegrating Sphere Photodiode Power Sensor, MCT (HgCdTe), 2.9 - 5.5 µm, 3 W
$3,685.26
Today

Fiber Photodiode Power Sensors

S150C and PM100D
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 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)

S150C

S151C

S152C

S153C

Included Connectors FCb & SMA FCb
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%
Resolutionc 10 pW (-80 dBm) 100 pW (-70 dBm) 10 pW (-80 dBm) 100 pW (-70 dBm)
Measurement Uncertaintyd ±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%
Responsivityf (Click for Details)
Raw Data

Raw Data

Raw Data

Raw Data
Coating/Diffuser N/A Absorptive ND (Schott NG3) N/A
Head Temperature Measuremente NTC Thermistor 3 kΩ
Aperture Thread External SM05 (0.535"-40)
Fiber Adapters Included: PM20-FC and PM20-SMA
Optional: PM20-LC, PM20-SC, and PM20-ST
Included: PM20-FC
Optional: PM20-LC, PM20-SC, PM20-ST, and PM20-SMA
Compatible Consoles PM400, PM200, PM100D, PM100USB, PM100A, and PM320E
  • 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-connectorized 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.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
S150C Support Documentation
S150CCompact Fiber Photodiode Power Sensor, Si, 350 - 1100 nm, 5 mW
$306.00
Today
S151C Support Documentation
S151CCompact Fiber Photodiode Power Sensor, Si, 400 - 1100 nm, 20 mW
$348.84
Today
S154C Support Documentation
S154CCompact Fiber Photodiode Power Sensor, InGaAs, 800 - 1700 nm, 3 mW
$439.62
Today
S155C Support Documentation
S155CCompact Fiber Photodiode Power Sensor, InGaAs, 800 - 1700 nm, 20 mW
$503.88
Today

High-Resolution Thermal Power Sensors

Item #a S401C S405C
Sensor Image
(Click the Image to Enlarge)
S401C S405C
Wavelength Range 190 nm - 20 µm 190 nm - 20 µm
Optical Power Range 10 µW - 1 W (3 Wb) 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%
Resolutionc 1 µW 5 µW
Measurement Uncertaintyd ±3% @ 1064 nm
±5% @ 190 nm - 10.6 µm
±3% @ 1064 nm 
±5% @ 250 nm - 17 µm
Response Timee 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, PM200, PM100D, PM100A, PM100USB, and PM320E
  • For complete specifications, please see the Specs tab.
  • 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 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.)
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+1 Qty Docs Part Number - Universal Price Available
S401C Support Documentation
S401CThermal Power Sensor Head, Surface Absorber, 0.19 - 20 µm, 1 W, Ø10 mm
$740.52
5-8 Days
S405C Support Documentation
S405CThermal Power Sensor Head, Surface Absorber, 0.19 - 20 µm, 5 W, Ø10 mm
$704.00
Today

Thermal Sensors for Max Powers of 10 W

Item #a S415C S425C
Sensor Image
(Click Image to Enlarge)
S415C S425C
Wavelength Range 190 nm - 20 µm 190 nm - 20 µm
Optical Power Range 2 mW - 10 W (20 Wb) 2 mW - 10 W (20 Wb)
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%
Resolutionc 100 µW 100 µW
Measurement
Uncertaintyd
±3% @ 1064 nm
±5% @ 250 nm - 17 µm
±3% @ 1064 nm
±5% @ 250 nm - 17 µm
Response Timee 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, PM200, PM100D, PM100USB, PM100A, and PM320E
  • For complete specifications, please see the Specs tab.
  • 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.
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+1 Qty Docs Part Number - Universal Price Available
S415C Support Documentation
S415CThermal Power Sensor Head, Surface Absorber, 0.19 - 20 µm, 10 W, Ø15 mm
$726.00
Today
S425C Support Documentation
S425CThermal Power Sensor Head, Surface Absorber, 0.19 - 20 µm, 10 W, Ø25.4 mm
$792.00
Today

Thermal Sensors for Max Powers from 40 W to 200 W

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.
  • 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)
S350C S425C-L S322C
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 Wb) 2 mW - 50 W (75 Wb) 100 mW - 200 W (250 Wb)
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%
Resolutionc 1 mW 100 µW 5 mW
Measurement Uncertaintyd ±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 Timee 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 Fanf
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, PM200, PM100D, PM100USB, PM100A, and PM320E
  • For complete specifications, please see the Specs tab.
  • 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.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
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S350C Support Documentation
S350CThermal Power Sensor Head, Surface Absorber, 0.19 - 1.1 µm and 10.6 µm, 40 W, Ø40 mm
$1,095.48
Today
S425C-L Support Documentation
S425C-LThermal Power Sensor Head, Surface Absorber, 0.19 - 20 µm, 50 W, Ø25.4 mm
$858.00
5-8 Days
S322C Support Documentation
S322CThermal Power Sensor Head, Surface Absorber, 0.25 - 11 µm, 200 W, Ø25 mm, Fan Cooled
$1,356.60
Today

Thermal Sensors for High Max Power Density Laser Pulses

Item #a S370C S470C
Sensor Image
(Click the Image to Enlarge)
S370C S470C
Wavelength Range 400 nm - 5.2 µm 250 nm - 10.6 µm
Optical Power Range 10 mW - 10 W (15 Wb) 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%
Resolutionc 250 µW 10 µW
Measurement Uncertaintyd ±3% @ 1064 nm 
±5% @ 400 nm - 1064 nm
±3% @ 1064 nm 
±5% @ 250 nm - 10.6 µm
Response Timee 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, PM200, PM100D, PM100A, PM100USB, and PM320E
  • For complete specifications, please see the Specs tab.
  • Two Minute Maximum Exposure Time
  • Measurement taken with the PM100D console for the S370C and with the 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).

Thermal Sensor Absorption Pulsed Lasers
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.
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S370C Support Documentation
S370CThermal Power Sensor Head, Volume Absorber, 0.4 - 5.2 µm, 10 W, Ø25 mm
$1,137.30
Today
S470C Support Documentation
S470CThermal Power Sensor Head, Volume Absorber, 0.25 - 10.6 µm, 0.1mW - 5W, Ø15 mm
$1,157.70
Today

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.

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.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
CAL1 Support Documentation
CAL1Recalibration Service for Si Power Meter Sensors Except S130 Series
Part Number:  Serial Number:
$143.82
Lead Time
CAL2 Support Documentation
CAL2Recalibration Service for Ge & InGaAs Power Meter Sensors Except S132 Series and S148C
Part Number:  Serial Number:
$162.18
Lead Time
CAL-S130 Support Documentation
CAL-S130Recalibration Service for Si Power Meter Sensors for S130 Series and PM160
Part Number:  Serial Number:
$167.28
Lead Time
CAL-S132 Support Documentation
CAL-S132Recalibration Service for Ge Power Meter Sensors for S132 Series only
Part Number:  Serial Number:
$177.48
Lead Time
CAL4 Support Documentation
CAL4Recalibration Service for MCT and Extended InGaAs Mid-IR Power Sensors (S148C and S180C)
Part Number:  Serial Number:
$289.68
Lead Time

Recalibration Service for Thermal Power and Pyroelectric Energy Sensors

Sensor Type Sensor Item #s
Thermal Power S175C, S302Ca, S305Ca, S310Ca, S314Ca, 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.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
CAL-S200 Support Documentation
CAL-S200Recalibration Service for Thermal Power and Pyroelectric Energy Sensors
Part Number:  Serial Number:
$182.58
Lead Time
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