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InGaAs Avalanche Photodetectors


  • High-Speed Response up to 1 GHz
  • Conversion Gains up to 9.0 × 106 V/W
  • Wavelength Range: 850 - 1650 nm or 900 - 1700 nm
  • Temperature-Compensated and Variable Gain Versions Available

APD110C

Standard APD

APD310

High-Speed APD

APD130C

Temperature-Compensated APD

APD430C

Variable-Gain, Temperature-Compensated APD

Related Items


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APD Temperature Stability
Click to Enlarge

The above plot shows sample data comparing the M factor stability of our temperature-compensated avalanche photodetectors to our standard packages. The blue shaded region indicates the temperature range over which the M factor stability is guaranteed to within ±3%.

Features

  • Noise Equivalent Powers (NEP) as Low as 0.12 pW/√Hz at 1500 nm
  • Bandwidth at 3 dB:
    • DC - 10 MHz [APD410C(/M)]
    • DC - 50 MHz [APD110C(/M) or APD130C(/M)]
    • DC - 400 MHz [APD430C(/M)]
    • 5 MHz - 1 GHz [APD310(/M)]
  • Temperature-Compensated Versions Provide M Factor Stability of ≤±3% Over 18 to 28 °C
  • Variable Gain Detectors Available: M Factor from 4 to 20
  • Internal SM05 and External SM1 Threading for Lens Tubes
  • Power Supply Included

Thorlabs' InGaAs Avalanche photodetectors (APDs) are designed to offer increased sensitivity and lower noise compared to standard PIN Detectors, making them ideal for applications with low optical power levels. In addition to our standard APDs, versions featuring variable gain (i.e., M factor) and/or temperature compensation are offered.

In general, avalanche photodiodes use an internal gain mechanism to increase sensitivity. A high reverse bias voltage is applied to the diodes to create a strong electric field. When an incident photon generates an electron-hole pair, the electric field accelerates the electrons, leading to the production of secondary electrons by impact ionization. The resulting electron avalanche can produce a gain factor of several hundred times, described by a multiplication factor, M, that is a function of both the reverse bias voltage and temperature. In general, the M factor increases with lower temperatures and decreases with higher temperatures. Similarly, the M factor will increase when the reverse bias voltage is raised and decrease when the reverse bias voltage is lowered.

Our APD130C(/M) temperature-compensated APD features an integrated thermistor that adjusts the bias voltage to compensate for the effect of temperature changes on the M factor. A comparison with our non-temperature-compensated APDs is provided in the graph to the right.

In addition to being temperature compensated, the APD410C(/M) and APD430C(/M) variable-gain APDs allow the reverse bias voltage across the diode to be adjusted via a rotary knob on the side of the housing, which varies the M factor continuously from 4 to 20.

For extremely light-sensitive applications, Thorlabs offers Menlo Systems' APD310 high-sensitivity avalanche photodectector, which offers high-speed response up to 1 GHz.

A complete list of all of our APDs, including those that have a silicon photodiode for use at UV and visible wavelengths, can be found on the Selection Guide tab. Please note that these packaged APDs are not suitable for use as single photon counters. Thorlabs has single photon counters available here.

InGaAs APD Selection Guide
Type Standard Temperature Controlled Variable Gain, Temperature Controlled High-Speed
Item # APD110C(/M): 900 - 1700 nm APD130C(/M): 900 - 1700 nm APD410C(/M): 900 - 1700 nm
APD430C(/M): 900 - 1700 nm
APD310: 850 - 1650 nm
Bandwidth (3 dB) DC - 50 MHz DC - 10 MHz or DC - 400 MHz 1 MHz - 1 GHz
Item #APD110C(/M)APD130C(/M)APD410C(/M)APD430C(/M)
Detector Type InGaAs APD
Wavelength Range 900 - 1700 nm
Output Bandwidth (3 dB) DC - 50 MHz DC - 10 MHz DC - 400 MHz
Active Area Diameter 0.2 mm
Typical Max Responsivity 9 A/W @ 1500 nm (M = 10)a 18 A/W @ 1550 nm (M = 20)
M Factorb,c 10 4 - 20 (Continuously Adjustable)
M Factor Temperature Stabilityd Not Specified ±2% (Typical); ±3% (Max)
Transimpedance Gain 50 kV/A with 50 Ω Terminatione
100 kV/A with High-Impedance Termination
250 kV/A with 50 Ω Terminatione
500 kV/A with High-Impedance Termination
5 kV/A with 50 Ω Terminatione
10 kV/A with High-Impedance Termination
Max Conversion Gainf,g 0.9 × 106 V/W 9.0 × 106 V/W 1.8 × 105 V/W
CW Saturation Power 4.2 µW 0.45 µW @ 1550 nm (M = 20)
2.25 µW @ 1550 nm (M = 4)
22 µW @ 1550 nm (M = 20)
110 µW @ 1550 nm (M = 4)
Max Input Powerh 1 mW
Minimum NEPf,i 0.46 pW/√Hz (DC - 50 MHz) 0.12 pW/√Hz (DC - 10 MHz) 0.45 pW/√Hz (DC - 100 MHz)
Integrated Noisej - 3.3 nW (RMS, DC - 50 MHz) 0.38 nW (RMS, DC - 10 MHz) 17 nW (RMS, DC - 400 MHz)
Electrical Output 50 Ω BNC
Max Output Voltage Swing 1.8 V with 50 Ω Termination
3.6 V with High-Impedance Termination
2.0 V with 50 Ω Termination
4.1 V with High-Impedance Termination
DC Offset Electrical Output ±15 mV ±25 mV ±3 mV
Power Supply ±12 V @ 200 mA
(110/230 VAC, 50 - 60 Hz, Switchable)
General
Operating Temperature Ranged 0 to 40 °C (Non-Condensing)
Storage Temperature Range -40 to 70 °C
Dimensions 2.00" x 2.50" x 1.00"
(50.8 mm x 63.5 mm x 24.5 mm)
  • These detectors are factory set to M = 10, but other M factors are available on request. Please contact techsupport@thorlabs.com for more information.
  • The responsivity scales with the M factor, which is dependent on the reverse bias voltage across the photodiode. For a given photodiode, a higher M factor corresponds to a higher reverse bias voltage, which increases the photodiode responsivity. By definition, M = 1 corresponds to a reverse bias voltage of 0 V.
  • For Small Signals
  • Within the 23 ± 5 °C temperature range.
  • 50 Ω termination is recommended for the best performance.
  • At the Peak Responsivity Wavelength. See the Graphs tab for the wavelength-dependent response.
  • The Conversion Gain is product of the Transimpedance Gain and the Responsivity for a given M factor and wavelength.
  • This value is the damage threshold for the photodiode.
  • For more information on how NEP is calculated, please see Thorlabs' Noise Equivalent Power White Paper.
  • At Maximum Gain Settings

All technical data are valid at 23 ± 2 °C (APD110C) or 23 ± 5 °C (APD130C, APD410C, and APD430C) and 45% ± 15% relative humidity (non-condensing).


Item #APD310
Detector Type InGaAs APD
Wavelength Range 850 - 1650 nm
Bandwidth 5 MHz - 1000 MHz (3 dB)
1 MHz - 1800 MHz (Max)
Active Area Diameter 0.03 mm
Optical Input Free Spacea
Conversion Gain (Max)b 2.5 x 104 V/W @ 1 GHz, 1500 nm
Max Input Power 10 mW
NEP (Calculated)c 2 pW/√Hz
Rise Timed 500 ps
Dark State Noise Levele -80 dBm
Operating Temperature 10 - 40°C
Electrical Output BNC, 50 Ω
Output Coupling AC
Current Consumption 200 mA
Supply Voltage 12 - 15 Vf
Dimensions 2.4" x 2.2" x 1.87"
(60 mm x 56 mm x 47.5 mm)
  • With adapter for Thorlabs' SM05 Mount
  • Gain Adjustable via Push Buttons
  • The noise-equivalent power is a measure of the detector's minimum detectable power per square root of bandwidth. Since this value only depends on the detector itself, it can be used to compare two detectors that do not have the same integration time. The smaller the NEP value, the better the detector.
  • Specified at peak reponsivity wavelength; rise time may vary with wavelength.
  • This is a measure of the noise when no light is incident on the detector's photosensitive area. Span: 5 MHz, Resolution Bandwidth: 3 kHz
  • Power supply included with adapters for EU/USA. Please contact us to request a different adapter.

BNC Female Output (Photodetector)

BNC Female

APD Male (Power Cables)

Pinout for PDA Power Cable

APD Female (Photodetector)

Pinout for PDA Power Connector

Components for Fiber Coupling
Item # Description
APD110C(/M), APD130C(/M),
APD410C(/M), or APD430C(/M)
Avalanche Photodetector
LM1XY(/M) Translating Lens Mount for Ø1" Optics
SM1L10 SM1 (1.035"-40) Lens Tube, 1" Long
- Fiber Collimator
(Dependent on Fiber)
AD11F or AD12F SM1-Threaded Adapters for Ø11 or Ø12 mm Fiber Collimators
(Dependent on Collimator)
- Mounted Molded Aspheric Lens
(Dependent on Collimator)
S1TM06, S1TM08, S1TM09,
S1TM10, or S1TM12
SM1-Threaded Adapter for Molded Aspheric Lens Cell
(Dependent on Lens)
Laser Diode Cage Plate Mount
Click to Enlarge

Output from a fiber is coupled into the APD110C using an aspheric lens to focus the signal onto the detector active area.

Fiber Coupling

In fiber coupling applications that use a detector with an active area smaller than Ø1 mm, the divergence of light from the fiber tip must be taken into account to ensure that all of the signal is focused onto the detector active area. The avalanche photodetectors available below have active areas of Ø0.2 mm or smaller, so we do not recommended using fiber connector adapters like Thorlabs' S120-FC due to the small size of the detector. High coupling losses and degradation of the frequency response may occur.

To achieve high coupling efficiency, a fiber collimation package, focusing lens, and X-Y translator should be used, as shown in the photo to the right. The APD110C avalanche photodetector is shown in the photo to the right with a fiber collimator, lens tube, lens tube collimator adapter, and X-Y translation mount. An adapter inside the lens tube holds an aspheric lens (not visible) to focus the collimated light onto the Ø0.2 mm active area of the detector. The X-Y translation mount corrects for any centering issues.


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Posted Comments:
Poster:alekkom
Posted Date:2016-07-11 20:17:22.35
Hello! I want to measure very low level intensity of light at output of optical fiber. It's equal of 5-100 picowatts. The light is continuous. Wavelength ranges are 500-1000 and 1000-1700 nm. Would you like to offer the detectors for VIS and near IR ranges?
Poster:shallwig
Posted Date:2016-07-12 10:52:22.0
This is a response from Stefan at Thorlabs. Thank you for your inquiry. At the moment we can offer silicon Avalanche photo detectors and InGaAs APDs but there are no APDs which cover the full range from 500-1700nm. I have contacted you directly to discuss your application in more detail.
Poster:j.john.jelen
Posted Date:2016-02-12 10:07:26.74
I would like to be able to periodically calibrate this APD for use in our lab. Is there a way to do this? Without this, we cannot depend on the measurements. thank you JJelen
Poster:shallwig
Posted Date:2016-02-15 06:34:40.0
This is a response from Stefan at Thorlabs. Thank you very much for your inquiry. At the moment we cannot offer a calibration for amplified photo detectors. The monochromator we use for calibrating our power meter sensors has a diameter of 2mm, only detectors with active area >2mm and fixed gain stage can be offered calibrated. I will contact you directly to discuss your application in detail.
Poster:
Posted Date:2015-05-12 10:23:28.273
I am using APD110C. the problem I have is that the gain is reducing over time and the DC component is keep increasing. Is there a good way to control this?
Poster:shallwig
Posted Date:2015-05-22 02:25:47.0
This is a response from Stefan at Thorlabs. Thank you very much for your inquiry, we do not understand the behavior of the APD as described. As you left no contact information could you please contact me at europe@thorlabs.com to troubleshoot this in more detail? Thank you.
Poster:peupel
Posted Date:2015-01-30 15:23:31.92
Dear web team, It would be nice having a direct link to the complete fiber coupling assembly (shown on the right side of product page) rather than several links to general product categories, or at least a list with suggested part number. This would help saving time to order the fiber coupling assembly. Thanks - Jens
Poster:shallwig
Posted Date:2015-01-30 11:51:05.0
This is a response from Stefan at Thorlabs. Thank you very much for your valuable feedback. Our web team will change the related items shown on the right side accordingly your suggestions. I will contact you directly to check if there is anything else we can help you with.
Poster:egregorio
Posted Date:2014-06-05 01:19:11.443
Dear Thorlabs, I have an APD110C/M InGaAs Avalanche Photodetector. I want to use it for the mesurement of a 1534 nm pulsed laser with 3 mJ (peak pulse), 6 ns (pulse length) at 10 Hz. I need a neutral filter in order to avoid damage to the photodetector. In order to select it, could you indicate me what is the maximum optical input (damage threshold) for a 6ns pulse or similar. What is the saturation input for a 6ns pulse or similar? Thank you.
Poster:tschalk
Posted Date:2014-06-06 04:37:05.0
This is a response from Stefan at Thorlabs. Thank you very much for your inquiry. We specify a maximum input power of 1mW for the APD110C. This value is the damage threshold for the photodiode, you can find this information in the spec sheet on our website here: http://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=4047 With your pulse parameters this detector is not suitable. The bandwidth of the detector is from DC-50MHz so the repetition rate of your source (10Hz) is no problem. But, the detector would not work linearly for such short pulses (6ns) and the pulses cannot be properly time resolved. I will contact you directly to discuss your application in detail and which alternative detector might fit better.
Poster:shikin
Posted Date:2014-05-30 09:18:44.32
Hi! How to use diode responsivity graph for correction of results?
Poster:shallwig
Posted Date:2014-06-19 05:55:07.0
This is a response from Stefan at Thorlabs. Thank you very much for your inquiry. With the responsivity R(?) for a given wavelength you can estimate the OUTPUT voltage of the APD110C Avalanche Photodetector. The OUTPUT voltage is a function of incident light power POPT, detectors responsivity R(?), multiplication factor M and transimpedance gain G given by: Vout =POPT *R( ?)*M*G The M-factor of APD110C is factory set to 10 at 23°C ambient temperature. The amplifier’s transimpedance gain G is 100.000 V/A for all Models APD110C. Further information can also be found in the manual on page 8 which you can find here: http://www.thorlabs.de/thorcat/19500/APD110C-Manual.pdf I will contact you directly to discuss your application in detail.
Poster:sys2643
Posted Date:2013-07-23 09:11:46.75
Hello I bought the APD301 Photodetector from your web site. But I have one problem when I had an experiment. The problem is that the sensing area of APD301 is very small. In our experiment, Now, we use 1520nm laser that has a bigger beam size than the sensing area of APD301. So, To solve this problem, I'm trying to find another product that can connect to APD301 such as FPD310 or LENS Tube System. So, Is it possible to use FPD310 system or lens tube system? I'm not sure that it is possible to connect FPD310 or lens tube system to APD310. If not, Do i use another optic system or product? so if you know methods of products to reduce beam spot size or increase the sensing size of detector using APD310. please let me know the method or product. thank you.
Poster:cdaly
Posted Date:2013-07-25 10:45:00.0
Response from Chris at Thorlabs: Thank you for your feedback. The APD310 and PFD310 are each detectors in their own right. If your beam is a bit too large for the APD310 detector, I would suggest focusing it down with an optic, which can be mounted via the SM05 threading on the front. Focusing down to this 30um detector size should be much easier than coupling into the single mode fiber of the FPD310.
Poster:weinberg.d.j
Posted Date:2013-03-27 11:10:20.347
Do you have any application notes on using APD110C or APD310 for time correlated single photon counting? My research group would like to look at NIR emission with a decay lifetime of approximately 2 microseconds, but I am not sure if the gain on these APDs will be sufficient. If necessary, we could use a boxcar integrator and collect the voltage output from the APD.
Poster:tschalk
Posted Date:2013-04-19 05:16:00.0
This is a response from Thomas at Thorlabs. Thank you very much for your inquiry. Unfortunately we do not provide any application notes for our avalanche Photodetectors. Basically the APDs are not suited for single photon measurements, however we do offer single photon counters (http://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=5255). I will contact you directly to discuss your application and to find out if the detector is suitable for your needs.
Poster:jvigroux
Posted Date:2012-10-04 13:20:00.0
A response from Julien at Thorlabs: Thank you for your inquiry. The rise time of this detector is about 10ns.
Poster:natalie.haustrup
Posted Date:2012-10-04 07:44:41.0
Could you please tell me what the rise time of this detector is?
Poster:jvigroux
Posted Date:2012-01-25 16:54:00.0
A response form Julien at Thorlabs: Thank you for your inquiry. The M factor can be assimilated to the gain of the detector. The higher the M factor, the higher the gain will be. The statement recommending not using a cell phone within less than 3 meters from the detector is based on a "worst case" scenario. The actual distance within which the power emitted by a mobile phone might be a problem will of course also depends on magnitude of your measurement signal. IF you have any furtehr question, please do not hesitate to contact us at techsupport@thorlabs.com
Poster:
Posted Date:2012-01-24 21:11:22.0
Hi, the APD manual says that different M-factors can be requested. What are the implications of a different M-factor (e.g. M=100) on the performance? Also, the manual states that mobile phones are not allowed within 3 meters (!) of the APD. Is this really required? Thank you.
Poster:jvigroux
Posted Date:2011-12-12 07:20:00.0
A response form Julien at Thorlabs: The bandwidth of the APD110 series can be limited to 10kHz if required. I will contact you directly to discuss the details of your request.
Poster:
Posted Date:2011-12-09 13:20:09.0
A response from Tyler at Thorlabs: Thank you for sending us your custom request. I have contacted an application engineer who will work with our production engineers for the product line to see if we can offer a custom detector to meet your needs.
Poster:alsturl
Posted Date:2011-12-08 15:35:06.0
I have a picosecond laser signal @5kHz which, after the photodetector, I digitize at 256kHz. Would it be possible to get a custom APD110A with a bandwidth of 10kHz so that the detector isn't faster than the digitizer? And without reducing the NEP or the output voltage into a Hi-Z? Your PDA100A is what I have been using, but I really could use more sensitivity. Thanks! -Adam
Poster:jjurado
Posted Date:2011-03-15 18:10:00.0
Response from Javier at Thorlabs to Alex: Thank you for contacting us with your request. A couple of PDA series amplified photodiode detectors are most likely the best best fit for your application. A regular biased DET detector may not be sensitive enough. Also, the APD210/310 avalanche detectors are AC coupled, and, along with the APD110 series detectors, they have a low saturation power (in the order of a few microwatts). Below is a link for these detectors: http://www.thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=4 I will contact you directly to get a better assessment of your application.
Poster:alekkom
Posted Date:2011-03-15 21:29:27.0
Hi! I measure weak light signals of thin optical fiber (2-5 microns core diameter). Wavelengths are 300-1800 nm, light sources are deiterium or galogen lamps. Now I want to change my old detectors. What series of detectors (NON fiber-coupled!!!)are more appropriate for my field? DET, APD210(310) or APD 110 series.... Great thanks! Alex

Avalanche Photodetector Selection Guide

Item #Detector
Type
Wavelength
Range
3 dB BandwidthActive Area
Diameter
M FactorTypical Max
Responsivity
Max Conversion GainTemperature
Compensated
Variable
Gain
APD120A2 UV Enhanced
Silicon APD
200 - 1000 nm DC - 50 MHz 1 mm 50 25 A/W @ 600 nm (M = 50) 2.5 x 106 V/Wa - -
APD130A2 DC - 50 MHz 1 mm 50 25 A/W @ 600 nm (M = 50) 2.5 x 106 V/Wa YES! -
APD410A2 DC - 10 MHz 0.5 mm 5 - 50 25 A/W @ 600 nm (M = 50) 12.5 x 106 V/Wa Yes! Yes!
APD430A2 DC - 400 MHz 0.2 mm 10 - 100 50 A/W @ 600 nm (M = 100) 5.0 x 105 V/Wa Yes! Yes!
APD120A Silicon APD 400 - 1000 nm DC - 50 MHz 1 mm 50 25 A/W @ 800 nm (M = 50) 2.5 x 106 V/Wa - -
APD130A DC - 50 MHz 1 mm 50 25 A/W @ 800 nm (M = 50) 2.5 x 106 V/Wa YES! -
APD410A DC - 10 MHz 1.0 mm 10 - 100 53 A/W @ 800 nm (M=100) 26.5 x 106 V/Wa Yes! Yes!
APD430A DC - 400 MHz 0.5 mm 10 - 100 53 A/W @ 800 nm (M = 100) 5.3 x 105 V/Wa YES! YES!
APD210 5 MHz - 1000 MHzb 0.5 mm N/A N/A 2.5 x 105 V/Wc - Yes!
APD110C InGaAs APD 900 - 1700 nm DC - 50 MHz 0.2 mm 10 9 A/W @ 1500 nm (M = 10) 0.9 x 106 V/Wa - -
APD130C DC - 50 MHz 0.2 mm 10 9 A/W @ 1500 nm (M = 10) 0.9 x 106 V/Wa YES! -
APD410C DC - 10 MHz 0.2 mm 4 - 20 18 A/W @ 1550 nm (M = 20) 9.0 x 106 V/Wa YES! YES!
APD430C DC to 400 MHz 0.2 mm 4 - 20 18 A/W @ 1550 nm (M = 20) 1.8 x 105 V/Wa YES! YES!
APD310 5 - 1000 MHzd 0.03 mm N/A N/A 2.5 x 104 V/We - YES!
  • At Peak Responsivity Wavelength
  • The Max Frequency Range is 1 MHz - 1600 MHz.
  • At 1 GHz and 800 nm
  • The Max Frequency Range is 1 MHz - 1800 MHz.
  • At 1 GHz and 1500 nm

InGaAs Avalanche Photodetectors

Key Specificationsa
Item # APD110C(/M)
Detector Type InGaAs APD
Wavelength Range 900 - 1700 nm
Output Bandwidth (3 dB) DC - 50 MHz
Active Area Diameter 0.2 mm
Typical Max Responsivity 9 A/W @ 1500 nm
Transimpedance Gain 50 kV/A with 50 Ω Termination
100 kV/A with High-Impedance Termination
Max Conversion Gainb 0.9 x 106 V/W
M Factor 10
M Factor Temperature Stability Not Specified
Saturation Power (CW) 4.2 µW
Minimum NEP (DC - 50 MHz)b 0.46 pW/√Hz
Dimensions (W x H x D) 2.00" x 2.50" x 1.00"
  • For a complete list of specifications and responsivity graphs, please see the Specs and Graphs tabs. Data are valid at 23 ± 2 °C and 45% ± 15% relative humidity (non-condensing).
  • At the Peak Responsivity Wavelength
  • Internal SM05 and External SM1 Threads Accept Fiber Adapters, Lens Tubes, and Other Components
  • SM1CP1 Internally SM1-Threaded Cap Included
  • Power Supply Included

Thorlabs' APD110C(/M) Avalanche Photodetector is offered as a cost-effective solution for customers with applications that do not require temperature compensation or variable gain.

The orientation of the mechanical and electrical connections, combined with the slim package design, ensures that these detectors can fit into tight spaces. Three 8-32 (M4) mounting holes, one on each edge of the package, further ensure easy integration into complicated mechanical setups. The package also provides compatibility with both our SM05 and SM1 Lens Tubes. An internally SM1-threaded cap is included.

Fiber Coupling Note:
For fiber-coupled applications, we do not recommend using fiber connector adapters such as Thorlabs' S120-FC due to the small size of the detector. High coupling losses and degradation of the frequency response may occur. To achieve high coupling efficiency, a fiber collimation package, focusing lens, and X-Y translator should be used. See the Fiber Coupling tab for details.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
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APD110C Support Documentation
APD110CInGaAs Avalanche Photodetector, 900 - 1700 nm, 8-32 Taps
$2,150.00
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APD110C/M Support Documentation
APD110C/MInGaAs Avalanche Photodetector, 900 - 1700 nm, M4 Taps
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Temperature-Compensated InGaAs Avalanche Photodetectors

Key Specificationsa
Item # APD130C(/M)
Detector Type InGaAs APD
Wavelength Range 900 - 1700 nm
Output Bandwidth (3 dB) DC - 50 MHz
Active Area Diameter 0.2 mm
Typical Max Responsivity 9 A/W @ 1500 nm (M = 10)
Transimpedance Gain 50 kV/A with 50 Ω Termination
100 kV/A with High-Impedance Termination
Max Conversion Gainb 0.9 x 106 V/W
M Factor 10
M Factor Temperature
Stabilitya
±2% (Typical);
±3% (Max)
Saturation Power (CW) 4.2 µW
Minimum NEP (DC - 50 MHz)b 0.46 pW/√Hz
Dimensions (W x H x D) 2.00" x 2.50" x 1.00"
  • For a complete list of specifications and responsivity graphs, please see the Specs and Graphs tabs. Data are valid at 23 ± 5 °C and 45% ± 15% relative humidity (non-condensing).
  • At the Peak Responsivity Wavelength
  • Temperature Compensated to Provide M Factor Stability of ≤±3%
    Over 18 to 28 °C
  • Internal SM05 and External SM1 Threads Accept Fiber Adapters,
    Lens Tubes, and Other Components
  • SM1CP1 Internally SM1-Threaded Cap Included
  • Power Supply Included

Thorlabs' APD130C(/M) Avalanche Photodetector features an integrated thermistor that maintains an M factor stability of ±3% or better over 23 ± 5 °C by adjusting the bias voltage across the avalanche photodiode, supplying improved output stability in environments with temperature variations.

The orientation of the mechanical and electrical connections, combined with the slim package design, ensures that these detectors can fit into tight spaces. Three 8-32 (M4) mounting holes, one on each edge of the package, further ensure easy integration into complicated mechanical setups. The package also provides compatibility with both our SM05 and SM1 Lens Tubes. An internally SM1-threaded cap is included.

Fiber Coupling Note:
For fiber-coupled applications, we do not recommend using fiber connector adapters such as Thorlabs' S120-FC due to the small size of the detector. High coupling losses and degradation of the frequency response may occur. To achieve high coupling efficiency, a fiber collimation package, focusing lens, and X-Y translator should be used. See the Fiber Coupling tab for details.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
APD130C Support Documentation
APD130CInGaAs Avalanche Photodetector, Temperature Compensated, 900 - 1700 nm, 8-32 Taps
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$2,200.00
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Variable-Gain Temperature-Compensated Avalanche Photodetectors

Key Specificationsa
Item # APD410C(/M)  APD430C(/M)
Detector Type InGaAs APD
Wavelength Range 900 - 1700 nm
Output Bandwidth  (3 dB) DC - 10 MHz DC - 400 MHz
Active Area Diameter 0.2 mm
Typical Max Responsivity 18 A/W @ 1550 nm (M = 20)
Transimpedance Gain 250 kV/A with 50 Ω Termination
500 kV/A with High-Impedance Termination
5 kV/A with 50 Ω Termination
10 kV/A with High-Impedance Termination
Max Conversion Gainb 9.0 x 106 V/W 1.8 x 105 V/W
M Factor Adjustment Rangec 4 - 20 (Continuous)
M Factor Temperature Stabilitya ±2% (Typical);
±3% (Max)
Saturation Power (CW) 0.45 µW @ 1550 nm (M = 20)
2.25 µW @ 1550 nm (M = 4)
22 µW @ 1550 nm (M = 20)
110 µW @ 1550 nm (M = 4)
Minimum NEPb 0.12 pW/√Hz (DC - 10 MHz) 0.45 pW/√Hz (DC - 100 MHz)
Dimensions (W x H x D) 2.00" x 2.50" x 1.00"
  • For a complete list of specifications and responsivity graphs, please see the Specs and Graphs tab. Data are valid at 23 ± 5 °C and 45% ± 15% relative humidity (non-condensing).
  • At the Peak Responsivity Wavelength
  • For Small Signals
  • Continuously Variable Gain: M Factor from 4 to 20 
  • Temperature Compensated to Provide M Factor Stability of ±3% Over 18 to 28 °C
  • Internal SM05 and External SM1 Threads Accept Fiber AdaptersLens Tubes, and Other Components
  • SM1CP1 Internally SM1-Threaded Cap Included
  • Power Supply Included
APD430C Variable Gain
Click to Enlarge

The M Factor is controlled by a knob on the side of the APD.

Thorlabs' APD410C(/M) and APD430C(/M) Avalanche Photodetectors have a variable gain that can be controlled by a knob on the right side of the housing. Like the APD130C detectors above, these devices feature an integrated thermistor that maintains an M factor stability of ±3% or better over 23 ± 5 °C by adjusting the bias voltage across the avalanche photodiode. Additionally, a rotary gain knob on the side of the detector adjusts the reverse bias voltage across the photodiode, allowing the M factor to vary from 4 to 20. Compared to the standard and temperature-controlled APDs above, the APD430C also offers a larger usable bandwidth of DC to 400 MHz. The APD410C offers a slightly lower bandwidth (DC to 10 MHz), but with higher sensitivity.

The orientation of the mechanical and electrical connections, combined with the slim package design, ensures that these detectors can fit into tight spaces. Three 8-32 (M4) mounting holes, one on each edge of the package, further ensure easy integration into complicated mechanical setups. The package also provides compatibility with both our SM05 and SM1 Lens Tubes. An internally SM1-threaded cap is included.

Fiber Coupling Note:
For fiber-coupled applications, we do not recommend using fiber connector adapters such as Thorlabs' S120-FC due to the small size of the detector. High coupling losses and degradation of the frequency response may occur. To achieve high coupling efficiency, a fiber collimation package, focusing lens, and X-Y translator should be used. See the Fiber Coupling tab for details.

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APD410C Support Documentation
APD410CInGaAs Variable-Gain Avalanche Photodetector, Temperature Compensated, 900 - 1700 nm, DC - 10 MHz, 8-32 Taps
$2,250.00
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APD430C Support Documentation
APD430CInGaAs Variable-Gain Avalanche Photodetector, Temperature Compensated, 900 - 1700 nm, DC - 400 MHz, 8-32 Taps
$2,250.00
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APD410C/M Support Documentation
APD410C/MInGaAs Variable-Gain Avalanche Photodetector, Temperature Compensated, 900 - 1700 nm, DC - 10 MHz, M4 Taps
$2,250.00
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APD430C/M Support Documentation
APD430C/MInGaAs Variable-Gain Avalanche Photodetector, Temperature Compensated, 900 - 1700 nm, DC - 400 MHz, M4 Taps
$2,250.00
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InGaAs High-Speed Avalanche Photodetectors

Key Specificationsa
Item # APD310
Detector Type InGaAs APD
Wavelength Range 850 - 1650 nm
Output Bandwidth 5 MHz - 1000 MHz (3 dB)
1 MHz - 1800 MHz (Max)
Active Area Diameter 0.03 mm
Transimpedance Gain Variable
Max Conversion Gain 2.5 x 104 V/W
M Factor Temperature Stability Not Specified
Minimum NEP 2 pW/√Hz
  • For a complete list of specifications and responsivity graphs, please see the Specs tab.
  • High-Speed Avalanche Photodetector (up to 1 GHz at 3 dB)
  • Internal SM05 (0.535"-40) Threads for Lens Tube Integration
  • 100 Step Adjustable Gain
  • Power Supply Included

Menlo Systems' APD310 InGaAs Avalanche Photodetector provides an extremely light-sensitive alternative to traditional PIN photodiodes and is sensitive and fast enough for the characterization of pulsed lasers on the order of nanoseconds. The InGaAs avalanche photodiode of the APD310 provides exceptional performance for low-light applications in the 850 - 1650 nm range. This APD maintains high-gain stability over the operating temperature range by utilizing a temperature-compensation circuit, which adjusts the ~150 VDC bias to ensure operation near the breakdown voltage.

A 40 dB gain amplifier is integrated into the package and is AC-coupled to band the output BNC. The output is matched to 50 Ω impedance. The detector has an electronic bandwidth of 5 MHz to 1 GHz (at 3 dB) and offers user-accessible push buttons providing 100 step gain adjustment. The APD310 has SM05 (0.535"-40) threads for easy integration into Thorlabs' family of lens tubes and cage assemblies. For direct fiber mounting, compatible fiber adapters are available. The bottom of the detector has a metric (M4) mounting hole and an M4 to 8-32 adapter for post mounting. The compact packaging allows the APD to be substituted directly into an existing setup while maintaining a small footprint on the benchtop. A location-specific power adapter is included with the detector; contact Technical Support for more information.

These photodetectors are not suitable for pulses longer than 30 ns or continuous light levels. Please see the FPD510 series for alternatives.

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APD310 Support Documentation
APD310High-Speed InGaAs Avalanche Detector, 850 - 1650 nm
$2,320.00
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12 VDC Regulated Power Supply

  • Replacement Power Supply for the Avalanche Photodetectors Sold Above
  • ±12 VDC Power Output
  • Current Limit Enabling Short Circuit and Overload Protection
  • On/Off Switch with LED Indicator
  • Switchable AC Input Voltage (115 or 230 VAC)
  • 6.6 ft (2 m) Cable with LUMBERG RSMV3-657/2M Male Connector
  • UL and CE Compliant

The LDS1212 ±12 VDC Regulated Linear Power Supply is intended as a replacement for the supply included with our APD series of avalanche photodetectors sold on this page. The cord has three pins: one for ground, one for +12 V, and one for -12 V (see diagram above). This power supply ships with a location-specific power cord and the voltage switch is set to the proper setting for your location before it is shipped. This power supply can also be used with our PDA series of amplified photodetectors, our PDB series of balanced photodetectors, our PMM series of photomultiplier modules, and our dichroic atomic vapor spectroscopy systems.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
LDS1212 Support Documentation
LDS1212±12 VDC Regulated Linear Power Supply, 6 W, 115/230 VAC
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