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High-Speed Free-Space Detectors


  • Sensitive to Wavelengths from 400 - 1700 nm
  • Bandwidths from 2 GHz to 5 GHz
  • Rise Times as Short as 70 ps

DET08C

AR-Coated Window

DET08CL

Uncoated Ball Lens

DET025A

AR-Coated Window

DET025AL

Uncoated Ball Lens

(Power Supply Not Shown to Scale)

DET1B

AC Power Adapter as
Battery Substitute

Related Items


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Selection Guide for High-Speed Free-Space Detectors
Wavelength Element Input Bandwidth Model
400 - 1100 nm Si Window 2 GHz DET025A
Lens DET025AL
800 - 1700 nm InGaAs Window 5 GHz DET08C
Lens DET08CL

Click to Enlarge

PDA200C Benchtop Photodiode Amplifier Connected to a DET025A Photodetector Using an SMA-to-BNC Cable

Features

  • Four Models Cover Wavelengths from 400 - 1700 nm
  • Bandwidths Ranging from 2 to 5 GHz
  • Rise Times from 70 ps to 155 ps
  • Free-Space Input
  • Available with a Flat, AR-Coated Window or Uncoated Ball Lens
  • SMA Output Connector
  • 8-32 (M4) Tap for Post Mounting

Thorlabs offers a variety of high-speed, high-bandwidth photodetectors designed for free-space input. Together, these detectors are sensitive from the visible to the near infrared (400 - 1700 nm); please see the "Selection Guide" table above for the exact spectral range covered by each detector. All detectors shown here feature GHz signal bandwidths and offer the same ease of use as the rest of our popular DET series. These detectors are designed to perform in test or measurement applications, including research in the fields of data communications, analog microwave, and general high-speed photonics. For comparable detection of fiber-coupled radiation, Thorlabs offers high-speed fiber-coupled detectors. We also have a variety of internally biased free-space photodiodes that operate at slower speeds than the detectors featured here. Our biased photodetectors are compatible with our benchtop photodiode amplifier and PMT transimpedance amplifier.

These free-space detectors are reverse biased and contain an internal bias battery, producing a linear response to the incident input light. To maintain the high signal bandwidth, the signal is output through an SMA connector. Thorlabs offers a complete range of electrical adapters and cables, including SMA cables and SMA-to-BNC adapters, for monitoring the output signal with an oscilloscope or other measurement electronics.

Our Si-based free-space detectors are designed for use in the 400 - 1100 nm (DET025A and DET025AL) wavelength range and provide a bandwidth of 2 GHz. For applications extending into the near infrared, consider our InGaAs-based free-space detectors, which provide detection in the 800 - 1700 nm (DET08C and DET08CL) wavelength range and provide a bandwidth of 5 GHz. When looking at high-speed signals, Thorlabs recommends using a 50 Ω load resistor. For lower bandwidth applications, our variable terminator or fixed stub-style terminators quickly adjusts the measured voltage.

Lens Input on DET08CL
Click to Enlarge

Uncoated Ball Lens Input on the DET08CL
Flat, AR-Coated Window Input on the DET025A
Click to Enlarge

Flat, AR-Coated Window Input on the DET025A

Both of the Si-based and InGaAs-based detectors are available with either a flat, AR-coated window or an uncoated ball lens free-space input (see the photos to the right for details). The ball lens captures and focuses incident light onto the relatively small active area of the detector, making it advantagous for use in applications where the signal input needs to be increased. If the input signal is sufficiently large, a detector with a window over the aperture is recommended since focusing a strong input signal can cause saturation, and possibly damage, to the detector. Additionally, we recommend the detectors with the window over those with the lens when working with a pulsed source, as the chromatic dispersion that occurs as the light passes through the lens can artificially elongate the pulse.

All of these detectors include an A23 12 VDC Bias battery; this was chosen because it provides an extremely low noise source of power. This battery is optionally replaceable by the DET1B Power Adapter Kit (sold below) when the detector is being used in applications where a small increase in the signal noise due to noise in the line voltage is permissible or the finite lifetime of a battery is not acceptable. Please note that due to slight physical variations of the positive terminal from manufacturer to manufacturer, Thorlabs only recommends using an Energizer battery in our DET series of photodetectors.

Please note that inhomogeneities at the edges of the active area of the detector can generate unwanted capacitance and resistance effects that distort the time-domain response of the photodiode output. Thorlabs therefore recommends that the incident light on the photodiode is well centered on the active area. Mounting a focusing lens or pinhole in front of the detector element is recommended.

Item # DET025A DET025AL DET08C DET08CL
Wavelength Range 400 - 1100 nm 800 - 1700 nm
Material Si InGaAs
Active Area Ø250 µm Ø80 µm
Bandwidth (-3 dB)a,b,c 2 GHz 5 GHz
Input Flat, AR-Coated Window Uncoated Ball Lens Flat, AR-Coated Window Uncoated Ball Lens
Ball Lens Diameter N/A 0.059" (1.50 mm) N/A 0.059" (1.50 mm)
Aperture Size Ø0.13" (Ø3.2 mm) Ø0.13" (Ø3.2 mm)
Signal Output SMA SMA
Minimum Resistor Load 50 Ω 50 Ω
Maximum Peak Power 18 mW 100 mW
Output Voltaged 2 V (Max)
Rise Time (tr) 150 ps @ 653 nm, 20%/80%a,b,c (Typ.) <70 ps @ 1538 nm,
20%/80%a,b,c (Typ.)
<70 ps @ 1538 nm,
20%/80%a,b,c (Typ.)
Fall Time (tf) 150 ps @ 653 nm, 80%/20%a,b,c (Typ.) <70 ps @ 1538 nm,
80%/20%a,b,c (Typ.)
<70 ps @ 1538 nm,
80%/20%a,b,c Typ.)
Bias Voltage 12 V
Dark Currenta,e 35 pA 1.5 nA
NEP (Maximum) 9.29 x 10-15 W/√Hz (@ 730 nm) 2 x 10-15 W/√Hz (@ 1550 nm)
Junction Capacitance 1.73 pF (Max) 0.3 pF
Photodiode Element - FDS025 -
  • Measured with a specified bias voltage of 12 V.
  • For a 50 Ω Load
  • Low battery voltage will result in slower rise times and decreased bandwidth.
  • A higher output voltage will decrease the bandwidth.
  • For a 1 MΩ Load
DET025A Series Spectral Response
Click to Enlarge

Click Here for Raw Data
DET025A Series Spectral Response
Click to Enlarge

Click Here for Raw Data
DET08C Series Spectral Response
Click to Enlarge

Click Here for Raw Data

DET08C Series Spectral Response
DET025A Series Spectral Response

Note: The data for all graphs above were obtained for their respective detectors with the AR-Coated windows included in the measurement set up. 

Signal Output

SMA Female

SMA Female

0 - 10 V w/ 50 Ω

Battery Lifetime

When using a battery-operated photodetector it is important to understand the battery’s lifetime and how this affects the operation of the detector. As a current output device, the output current of the photodetector is directly proportional to the light incidented on the detector. Most users will convert this current to a voltage by using a load-terminating resistor. The resistance value is approximately equal to the circuit gain. For very high speed detectors, such as those sold on this page, it is very important to use a 50 Ω terminating resistor to match the impedance of standard coax cables to reduce cable reflections and improve overall signal performance and integrity. Most high bandwidth scopes come equipped with this termination.

The battery usage lifetime directly correlates to the current used by the detector. Most battery manufacturers provide a battery lifetime in terms of mA hr. For example, the battery supplied with the DET08CL detectors is rated for 40 mA hrs. This means that it will reliably operate for 40 hr at a current draw of 1.0 mA. This battery will be used in the following example on how to determine battery lifetime based on usage.

For this example we have a 780 nm light source with an average 1 mW power is applied to an DET08CL. The responsivity of a biased photodetector based on the response curve at this wavelength is 0.5 A/W. The photocurrent can be calculated as:

eq1

Given the battery has a rated lifetime of 40 mA hr, the battery will last:

Eq2

or 3.3 days of continuous use. By reducing the average incident power of the light to 10 µW, the same battery would last for about 333 days when used continuously. When using the recommended 50 Ω terminating load, the 0.5 mA photocurrent will be converted into a voltage of:

Eq3

If the incident power level is reduced to 10 µW, the output voltage becomes 0.25 mV. For some measurement devices this signal level may be too low and a compromise between battery life and measurement accuracy will need to be made.

When using a battery-powered, biased photodetector, it is desirable to use as low a light intensity as is possible, keeping in mind the minimum voltage levels required. It is also important to remember that a battery will not immediately cease producing a current as it nears the end of its lifetime. Instead, the voltage of the battery will drop, and the electric potential being applied to the photodiode will decrease. This in turn will increase the response time of the detector and lower its bandwidth. As a result, it is important to make sure the battery has sufficient voltage (as given in the Troubleshooting chapter of the detector's manual) for the detector to operate within its specified parameters. The voltage can be checked with a multimeter.

Another suggestion to increase the battery lifetime is to remove, or power down the light source illuminating the sensor. Without the light source, the photodetector will continue to draw current proportional to the photodetector’s dark current, but this current will be significantly smaller. For example, the DET08CL has a dark current less than 1.5 nA.

For applications where a DET series photodetector is being continuously illuminated with a relatively high-power light source or if having to change the battery is not acceptable, we offer the DET1B adapter and power supply. The drawback to this option is the noise in the line voltage will add to the noise in the output signal and could cause more measurement uncertainty.

Photodiode Tutorial

Theory of Operation

A junction photodiode is an intrinsic device that behaves similarly to an ordinary signal diode, but it generates a photocurrent when light is absorbed in the depleted region of the junction semiconductor. A photodiode is a fast, highly linear device that exhibits high quantum efficiency based upon the application and may be used in a variety of different applications.

It is necessary to be able to correctly determine the level of the output current to expect and the responsivity based upon the incident light. Depicted in Figure 1 is a junction photodiode model with basic discrete components to help visualize the main characteristics and gain a better understanding of the operation of Thorlabs' photodiodes.

Equation 1
Photodiode Circuit Diagram
Figure 1: Photodiode Model

Photodiode Terminology

Responsivity
The responsivity of a photodiode can be defined as a ratio of generated photocurrent (IPD) to the incident light power (P) at a given wavelength:

Equation 2

Modes of Operation (Photoconductive vs. Photovoltaic)
A photodiode can be operated in one of two modes: photoconductive (reverse bias) or photovoltaic (zero-bias). Mode selection depends upon the application's speed requirements and the amount of tolerable dark current (leakage current).

Photoconductive
In photoconductive mode, an external reverse bias is applied, which is the basis for our DET series detectors. The current measured through the circuit indicates illumination of the device; the measured output current is linearly proportional to the input optical power. Applying a reverse bias increases the width of the depletion junction producing an increased responsivity with a decrease in junction capacitance and produces a very linear response. Operating under these conditions does tend to produce a larger dark current, but this can be limited based upon the photodiode material. (Note: Our DET detectors are reverse biased and cannot be operated under a forward bias.)

Photovoltaic
In photovoltaic mode the photodiode is zero biased. The flow of current out of the device is restricted and a voltage builds up. This mode of operation exploits the photovoltaic effect, which is the basis for solar cells. The amount of dark current is kept at a minimum when operating in photovoltaic mode.

Dark Current
Dark current is leakage current that flows when a bias voltage is applied to a photodiode. When operating in a photoconductive mode, there tends to be a higher dark current that varies directly with temperature. Dark current approximately doubles for every 10 °C increase in temperature, and shunt resistance tends to double for every 6 °C rise. Of course, applying a higher bias will decrease the junction capacitance but will increase the amount of dark current present.

The dark current present is also affected by the photodiode material and the size of the active area. Silicon devices generally produce low dark current compared to germanium devices which have high dark currents. The table below lists several photodiode materials and their relative dark currents, speeds, sensitivity, and costs.

MaterialDark CurrentSpeedSpectral RangeCost
Silicon (Si) Low High Speed Visible to NIR Low
Germanium (Ge) High Low Speed NIR Low
Gallium Phosphide (GaP) Low High Speed UV to Visible Moderate
Indium Gallium Arsenide (InGaAs) Low High Speed NIR Moderate
Indium Arsenide Antimonide (InAsSb) High Low Speed NIR to MIR High
Extended Range Indium Gallium Arsenide (InGaAs) High High Speed NIR High
Mercury Cadmium Telluride (MCT, HgCdTe) High Low Speed NIR to MIR High

Junction Capacitance
Junction capacitance (Cj) is an important property of a photodiode as this can have a profound impact on the photodiode's bandwidth and response. It should be noted that larger diode areas encompass a greater junction volume with increased charge capacity. In a reverse bias application, the depletion width of the junction is increased, thus effectively reducing the junction capacitance and increasing the response speed.

Bandwidth and Response
A load resistor will react with the photodetector junction capacitance to limit the bandwidth. For best frequency response, a 50 Ω terminator should be used in conjunction with a 50 Ω coaxial cable. The bandwidth (fBW) and the rise time response (tr) can be approximated using the junction capacitance (Cj) and the load resistance (RLOAD):

Equation 3

Noise Equivalent Power
The noise equivalent power (NEP) is the generated RMS signal voltage generated when the signal to noise ratio is equal to one. This is useful, as the NEP determines the ability of the detector to detect low level light. In general, the NEP increases with the active area of the detector and is given by the following equation:

Photoconductor NEP

Here, S/N is the Signal to Noise Ratio, Δf is the Noise Bandwidth, and Incident Energy has units of W/cm2. For more information on NEP, please see Thorlabs' Noise Equivalent Power White Paper.

Terminating Resistance
A load resistance is used to convert the generated photocurrent into a voltage (VOUT) for viewing on an oscilloscope:

Equation 4

Depending on the type of the photodiode, load resistance can affect the response speed. For maximum bandwidth, we recommend using a 50 Ω coaxial cable with a 50 Ω terminating resistor at the opposite end of the cable. This will minimize ringing by matching the cable with its characteristic impedance. If bandwidth is not important, you may increase the amount of voltage for a given light level by increasing RLOAD. In an unmatched termination, the length of the coaxial cable can have a profound impact on the response, so it is recommended to keep the cable as short as possible.

Shunt Resistance
Shunt resistance represents the resistance of the zero-biased photodiode junction. An ideal photodiode will have an infinite shunt resistance, but actual values may range from the order of ten Ω to thousands of MΩ and is dependent on the photodiode material. For example, and InGaAs detector has a shunt resistance on the order of 10 MΩ while a Ge detector is in the kΩ range. This can significantly impact the noise current on the photodiode. For most applications, however, the high resistance produces little effect and can be ignored.

Series Resistance
Series resistance is the resistance of the semiconductor material, and this low resistance can generally be ignored. The series resistance arises from the contacts and the wire bonds of the photodiode and is used to mainly determine the linearity of the photodiode under zero bias conditions.

Common Operating Circuits

Reverse Biased DET Circuit
Figure 2: Reverse-Biased Circuit (DET Series Detectors)

The DET series detectors are modeled with the circuit depicted above. The detector is reverse biased to produce a linear response to the applied input light. The amount of photocurrent generated is based upon the incident light and wavelength and can be viewed on an oscilloscope by attaching a load resistance on the output. The function of the RC filter is to filter any high-frequency noise from the input supply that may contribute to a noisy output.

Reverse Biased DET Circuit
Figure 3: Amplified Detector Circuit

One can also use a photodetector with an amplifier for the purpose of achieving high gain. The user can choose whether to operate in Photovoltaic of Photoconductive modes. There are a few benefits of choosing this active circuit:

  • Photovoltaic mode: The circuit is held at zero volts across the photodiode, since point A is held at the same potential as point B by the operational amplifier. This eliminates the possibility of dark current.
  • Photoconductive mode: The photodiode is reversed biased, thus improving the bandwidth while lowering the junction capacitance. The gain of the detector is dependent on the feedback element (Rf). The bandwidth of the detector can be calculated using the following:

Equation 5

where GBP is the amplifier gain bandwidth product and CD is the sum of the junction capacitance and amplifier capacitance.

Effects of Chopping Frequency

The photoconductor signal will remain constant up to the time constant response limit. Many detectors, including PbS, PbSe, HgCdTe (MCT), and InAsSb, have a typical 1/f noise spectrum (i.e., the noise decreases as chopping frequency increases), which has a profound impact on the time constant at lower frequencies.

The detector will exhibit lower responsivity at lower chopping frequencies. Frequency response and detectivity are maximized for

Photoconductor Chopper Equation


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Posted Comments:
Poster:minowa
Posted Date:2017-11-26 17:16:53.44
I'm considering to buy DET025AL/M or DET025A/M. Our signal light is very low power (~ 1 mW). So, which is better in terms of the signal strength, the window model with an external focusing lens or the ball-lens model?
Poster:nbayconich
Posted Date:2017-12-28 05:23:23.0
Thank you for contacting Thorlabs. Performance will be similar between using the DET025AL or the DET025A with an external lens. If your collimated beam diameter is larger than the aperture of the DET025AL's ball lens then using an external focusing lens that has a larger clear aperture with the DET025A is recommended.
Poster:mitch
Posted Date:2016-01-22 09:45:41.243
Hi, I have ordered several of these (window, not lens) but I would like to mount a pinhole in front. Do you have some sort of alignment aid to get it right? Is there a possibility of getting an adapter that screws onto the front to help with 1" optics, pinholes, etc? Thanks
Poster:jlow
Posted Date:2016-01-22 01:49:31.0
Response from Jeremy at Thorlabs: There's no direct way to mount pinholes to the front of the detector. The detector is meant to be mounted on an optical post and you will have to manually align a pinhole that is mounted on another post.
Poster:rbwilcox
Posted Date:2014-10-28 18:34:22.573
In the overview, you mention that the lens might cause dispersion of a pulse, distorting the response, and so the lens version is not recommended for pulses. If the total optical delay through the lens is about 10ps (~2mm x 1.5/c), and the impulse response for the DET08C is ~125ps (according to the graph presented), then there is no way chromatic dispersion could affect the diode response. I'm going to buy the DET08CL for pulses.
Poster:jlow
Posted Date:2014-11-06 01:47:50.0
Response from Jeremy at Thorlabs: Thank you for the feedback. We will correct the web presentation.

The following table lists Thorlabs' selection of photodiodes and photoconductive detectors. Item numbers in the same row contain the same detector element.

Photodetector Cross Reference
Wavelength Material Unmounted
Photodiode
Unmounted
Photoconductor
Mounted
Photodiode
Biased
Detector
Amplified
Detector
150 - 550 nm GaP FGAP71 - SM05PD7A DET25K(/M) PDA25K(-EC)
200 - 1100 nm Si FDS010 - SM05PD2A
SM05PD2B
DET10A(/M) PDA10A(-EC)
Si - - SM1PD2A - -
320 - 1100 nm Si - - - - PDA8A(/M)
Si FD11A - SM05PD3A - PDF10A(/M)
340 - 1100 nm Si - - - - PDA100A(-EC)
Si FDS10X10 - - - -
350 - 1100 nm Si FDS100
FDS100-CAL a
- SM05PD1A
SM05PD1B
DET36A(/M) PDA36A(-EC)
Si FDS1010
FDS1010-CAL a
- SM1PD1A
SM1PD1B
DET100A(/M)
400 - 1000 nm Si - - - - PDA015A(/M)
FPD510-FV
FPD310-FV
FPD310-FC-VIS
FPD510-FC-VIS
FPD610-FC-VIS
FPD610-FS-VIS
400 - 1100 nm Si FDS015 b - - - -
Si FDS025 b
FDS02 c
- - DET02AFC(/M)
DET025AFC(/M)
DET025A(/M)
DET025AL(/M)
-
400 - 1700 nm Si & InGaAs DSD2 - - - -
500 - 1700 nm InGaAs - - - DET10N2 -
750 - 1650 nm InGaAs - - - - PDA8GS
800 - 1700 nm InGaAs FGA015 - - - PDA015C(/M)
InGaAs FGA21
FGA21-CAL a
- SM05PD5A DET20C(/M) PDA20C(/M)
PDA20CS(-EC)
InGaAs FGA01 b
FGA01FC c
- - DET01CFC(/M) -
InGaAs FDGA05 b - - - PDA05CF2
InGaAs - - - DET08CFC(/M)
DET08C(/M)
DET08CL(/M)
PDF10C(/M)
800 - 1800 nm Ge FDG03
FDG03-CAL a
- SM05PD6A DET30B2 PDA30B2
Ge FDG50 - - DET50B2 PDA50B(-EC)
Ge FDG05 - - - -
800 - 2600 nm InGaAs - - - DET05D(/M) -
850 - 1650 nm InGaAs - - - - FPD510-F
900 - 1700 nm InGaAs FGA10 - SM05PD4A DET10C(/M) PDA10CS(-EC)
900 - 2600 nm InGaAs FD05D - - - -
FD10D - - - -
- - - DET10D2 -
950 - 1650 nm InGaAs - - - - FPD310-FC-NIR
FPD310-FS-NIR
FPD510-FC-NIR
FPD610-FC-NIR
FPD610-FS-NIR
1.0 - 2.9 µm PbS - FDPS3X3 - - PDA30G(-EC)
1.0 - 5.8 µm InAsSb - - - - PDA10PT(-EC)
1.2 - 2.6 µm InGaAs - - - - PDA10D(-EC)
1.5 - 4.8 µm PbSe - FDPSE2X2 - - PDA20H(-EC)
2.0 - 5.4 µm HgCdTe (MCT) - - - - PDA10JT(-EC)
2.0 - 8.0 µm HgCdTe (MCT) VML8T0
VML8T4 d
- - - PDAVJ8
2.0 - 10.6 µm HgCdTe (MCT) VML10T0
VML10T4 d
- - - PDAVJ10
2.7 - 5.0 µm HgCdTe (MCT) VL5T0 - - - -
  • Calibrated Unmounted Photodiode
  • Unmounted TO-46 Can Photodiode
  • Unmounted TO-46 Can Photodiode with FC/PC Bulkhead
  • Photovoltaic Detector with Thermoelectric Cooler

Free-Space Si Detectors: 400 - 1100 nm

SMA Output on DET025A
Click to Enlarge

SMA Output on the DET025A Detector

The DET025A(/M) and DET025AL(/M) high-speed, free-space detectors are designed for use in the 400 - 1100 nm spectral range. The DET025A(/M) has a flat, AR coated window at the input aperture, while the DET025AL(/M) uses the FDS025 photodiode which has an uncoated ball lens at the input aperture that focuses light onto the detector.

Both detectors have a 2 GHz bandwidth. An 8-32 tapped mounting hole (M4 for the metric version) allows easy mounting to our Ø1/2" posts.

Item # Wavelength Detector Input Bandwidth Max Peak Power Bias
Voltage
Rise Time Fall Time
DET025A(/M) 400 - 1100 nm Si Flat AR-Coated
Window
2 GHz 18 mW 12 V 150 ps 150 ps
DET025AL(/M) Uncoated Ball Lens
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
DET025A Support Documentation
DET025A2 GHz Si Free-Space Photodetector with Window, 400 - 1100 nm, 8-32 Tap
$215.22
Today
DET025AL Support Documentation
DET025AL2 GHz Si Free-Space Photodetector with Lens, 400 - 1100 nm, 8-32 Tap
$215.22
Today
+1 Qty Docs Part Number - Metric Price Available / Ships
DET025A/M Support Documentation
DET025A/M2 GHz Si Free-Space Photodetector with Window, 400 - 1100 nm, M4 Tap
$215.22
Today
DET025AL/M Support Documentation
DET025AL/M2 GHz Si Free-Space Photodetector with Lens, 400 - 1100 nm, M4 Tap
$215.22
Today

Free-Space InGaAs Detectors: 800 - 1700 nm

SMA Output on DET08C
Click to Enlarge

SMA Output on the DET08C Detector

The DET08C(/M) and DET08CL(/M) high-speed, free-space detectors are designed for use in the 800 - 1700 nm spectral range. The DET08C(/M) detector has a flat, AR-coated window at the input aperture, while the DET08CL(/M) detector has an uncoated ball lens at the input aperture that focuses the light onto the detector.

These detectors use an InGaAs detector element and feature a 5 GHz bandwidth. An 8-32 tapped mounting hole (M4 for the metric version) allows easy mounting to our series of Ø1/2" posts.

Item # Wavelength Detector Input Bandwidth Max Peak Power Bias
Voltage
Rise Time Fall Time
DET08C(/M) 800 - 1700 nm InGaAs Flat, AR-Coated
Window
5 GHz 100 mW 12 V <70 ps <70 ps
DET08CL(/M) Uncoated Ball Lens
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
DET08C Support Documentation
DET08C5 GHz InGaAs Free-Space Photodetector with Window, 800 - 1700 nm, 8-32 Tap
$279.48
Today
DET08CL Support Documentation
DET08CL5 GHz InGaAs Free-Space Photodetector with Lens, 800 - 1700 nm, 8-32 Tap
$279.48
Today
+1 Qty Docs Part Number - Metric Price Available / Ships
DET08C/M Support Documentation
DET08C/M5 GHz InGaAs Free-Space Photodetector with Window, 800 - 1700 nm, M4 Tap
$279.48
Today
DET08CL/M Support Documentation
DET08CL/M5 GHz InGaAs Free-Space Photodetector with Lens, 800 - 1700 nm, M4 Tap
$279.48
Today

Replacement Batteries for Photodetectors

Exploded View of SBP12 Battery Pack
Click to Enlarge

Exploded View of SBP12 Battery Pack
  • A23: For Currently Shipping DET Photodetectors
  • SBP12: For Discontinued SV2-FC and SIR5-FC Fiber-Coupled Photodetectors
  • T505: For Discontinued DET1-SI and DET2-SI Detectors

A23 and T505 Alkaline Batteries
The A23 and T505 are replacement alkaline batteries for Thorlabs' currently shipping and discontinued DET photodetectors. For cases where the finite lifetime of a battery is not acceptable, we also offer an AC power adapter; please see below for more information. Information on expected battery lifetime is in the Battery Lifetime tab above.

SBP12 Battery Pack
The SBP12 is a 12 V replacement alkaline battery pack for our SV2-FC and SIR5-FC fiber-coupled photodetectors. It completely replaces the 20 V battery that was originally used (Item # SBP20), which we can no longer offer due to shipping regulations. Our testing shows that a 12 V bias provides performance similar to a 20 V bias, and the performance is within the detectors' stated specifications.

As shown by the photo to the right, the SBP12 consists of an A23 battery in a newly designed housing. You may already own this housing if you purchased your SV2-FC or SIR5-FC in or after October 2013, or if you have already purchased an SBP12. If you do own this housing, then it is necessary to purchase only the A23 battery.

Customers who own an SV2-FC or SIR5-FC detector purchased before October 2013 will need to bend two pins to ensure that the SBP12 battery pack makes electrical contact. The procedure is illustrated in the spec sheet of the battery, which can be downloaded here.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
A23 Support Documentation
A23Replacement 12 V Alkaline Battery for DET Series (Except DET1-SI and DET2-SI)
$5.03
Today
SBP12 Support Documentation
SBP12Replacement 12 V Alkaline Battery Pack for SV2-FC or SIR5-FC
$85.94
Today
T505 Support Documentation
T505Replacement 22.5 V Alkaline Battery for DET1-SI and DET2-SI
$17.14
Today

DET Power Adapter

Animation of Installation Procedure

SMA Output on SIR5-FC
Click to Enlarge
Shown is the DET1B adapter bundle being used to replace a DET100A battery. The DET1B includes the DET1A power adapter and the LDS9 power supply.
  • DET1A: Power Adapter for DET Series Detectors
  • LDS9: AC Power Supply
  • DET1B: DET1A and LDS9 Bundle

The DET1A is a power adapter for our DET series detectors. The DET1A features a 2.5 mm mono jack and will directly replace the A23 battery, cap, and spring to allow the detector to run directly from our LDS9 power supply (sold separately).

The LDS9 is a 9 V regulated power supply with a ripple voltage of less than 10 mV RMS. Its features include a current limit for short circuit and overload protection, an on/off switch with an LED indicator, and a switchable AC input voltage (115 or 230 VAC).

The DET1B power supply bundle includes both the DET1A and LDS9. It can be used to replace the battery in our DET series detectors. To use the DET1B, simply replace the battery cap and battery with the included DET1A adapter, and then insert the 2.5 mm mono plug from the LDS9 power supply into the adapter. This procedure is depicted in the animation to the right.

Please also note that the LDS9 power supply offers a lower bias voltage than the 12 V provided by the standard A23 battery. To minimize noise, our photodetectors contain voltage regulators that expect a higher input voltage than the bias that is eventually applied to the detector. For best performance, we therefore recommend this power supply only when it can supply a higher bias than the detector requires. Using a lower voltage will reduce the detector's bandwidth and rise time.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
DET1B Support Documentation
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LDS9 Support Documentation
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+1 Qty Docs Part Number - Universal Price Available / Ships
DET1A Support Documentation
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+1 Qty Docs Part Number - Metric Price Available / Ships
DET1B-EC Support Documentation
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LDS9-EC Support Documentation
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