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InGaAs Avalanche Photodetectors

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Item #APD110CAPD310
Detector TypeInGaAs APD
Wavelength Range900 - 1700 nm850 - 1650 nm
Active Detector Diameter0.2 mm0.03 mm
Transimpedance Gain100 kV/A
50 kV/A with 50 Ω Termination
Max Conversion Gain0.9 x 106 V/W2.5 x 104 V/W
@ 1 GHz, 1500 nm
Output Bandwidth (3 dB)DC - 50 MHz1 - 1000 MHz
Minimum NEP0.46 pW/√Hz0.4 pW/√Hz


  • Exceptional High Signal to Noise Ratio Down to 0.4 pW/√Hz
  • Maximum Response Speed: 50 MHz (APD110C) or 1 GHz (APD310)
  • SM1 or SM05 Lens Tube Compatible
  • Power Supply Included

Thorlabs' InGaAs Avalanche photodetectors (APD) are designed to offer increased sensitivity and lower noise compared to standard PIN Detectors, making them ideal for applications with low optical power levels. For extremely light-sensitive applications, Thorlabs offers Menlo Systems' APD310 high-sensitivity avalanche photodectector, which offers high-speed response up to 1 GHz.

Item #APD110C
Detector TypeInGaAs APD
Wavelength Range900 - 1700 nm
Typical Max Responsivity9 A/W
@ 1500 nm
M = 10
Transimpedance Gain100 kV/A
50 kV/A with 50 Ω Termination
Maximum Conversion Gain0.9 x 106 V/W
Active Detector Diameter0.2 mm
CW Saturation Power4.2 µW
Max Input Powera1 mW
Output Bandwidth (3dB)DC - 50 MHz
Minimum NEP0.46 pW/(Hz1/2)
Electrical OutputBNC, 50 Ω
Max Output Voltage Threshold3.6 V
DC Offset Electrical Output<±15 mV
Device Dimensions2.0" x 3.0" x 1.1"
(50.8 mm x 76.2 mm x 27.9 mm)
Power Supply±12 V @ 200 mA (110/230 VA switchable)
  • This value is the damage threshold for the photodiode.
Item #APD310
Detector TypeInGaAs APD
Wavelength Range850 - 1650 nm
Gain (Max)a2.5 x 104 V/W @ 1 GHz, 1500 nm
Gain Step Size250 V/W @ 1 GHz, 1500 nm
Optical InputFree Spaceb
Detector Diameter0.03 mm
Current Consumption200 mA
Incident Power (Max)10 mW
Frequency Range (Max)1 MHz - 1800 MHz
3 dB Bandwidth5 MHz - 1000 MHz
NEP (calculated)c2 pW/(Hz1/2)
Rise Timed500 ps
Dark State Noise Levele-80 dBm
Electrical OutputBNC, 50 Ω
Output CouplingAC
Device Dimensions2.4" x 2.2" x 1.87"
60 mm x 56 mm x 47.5 mm
Supply Voltage12 - 15 Vf
Operating Temperature10 - 40°C
  • Gain Adjustable via Push Buttons
  • With adapter for Thorlabs' SM05 Mount
  • 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.

Output Signal

BNC Female

BNC Female

Max voltage of 3.6 V for Hi-Z & 1.8 V for 50 Ω

Typical Responsivity of the APD110C Photodetector

APD110C Responsivity
Click to Enlarge

Pulse Response of the APD310 Photodetector

Pulse Train for APD310

Click the Support Documentation icon document icon or Part Number below to view the available support documentation
Part Number Product Description
APD110C Support Documentation APD110C : Avalanche Photodetector, InGaAs, 900 - 1700 nm
APD110C/M Support Documentation APD110C/M : Avalanche Photodetector, InGaAs, 900 - 1700 nm, Metric
APD310 Support Documentation APD310 : High-Speed Avalanche Detector, InGaAs, 850 - 1650 nm

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Posted Comments:
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: I will contact you directly to discuss your application in detail.
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: 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: 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: shikin
Posted Date: 2014-05-30 09:18:44.32
Hi! How to use diode responsivity graph for correction of results?
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: 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: 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 ( 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
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.
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: 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
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InGaAs Avalanche Photodetectors

Laser Diode Cage Plate Mount
Click to Enlarge

APD110C with fiber collimator, lens tube, lens tube collimator adapter, and X-Y translation mount. An aspheric lens (not visible) is mounted in the lens tube to focus the collimated light onto the detector.

The APD110C Avalanche Photodetector combines an InGaAs avalanche photodiode with a specially designed amplifier that includes an active lowpass filter to suppress out-of-band noise effectively. This avalanche photodetector, which is designed to detect light in the 900 - 1700 nm range, offers an exceptional low NEP and high transimpedance gain, making it ideal for fast low-light-level detection applications, such as spectroscopy, fluorescence measurements, lidar (laser radar), and optical range finders. Although the APD110C module is very sensitive to light, it will not saturate in ambient light.

The detector has a compact housing measuring just 2.0" x 3.0" x 1.1" (50.8 mm x 76.2 mm x 27.9 mm). The output and power leads to the detector come in perpendicular to the light path. An 8-32 (M4) tapped hole, provided on three sides of the detector, allows post mounting with the leads pointing left, right, or upward. Also, internal SM05 (0.535”-40) and external SM1 (1.035”-40) threads are concentric with the avalanche photodiode, which allows the user to mount lens tubes, fiber adapters, or other SM1- and SM05-compatible components directly to the detector housing. A zero input cap is included.

Fiber Coupling Note:
For fiber coupled applications we do not recommended using fiber connector adapters like Thorlabs' S120-FC or SM1xx 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.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
APD110C Support Documentation
APD110C Avalanche Photodetector, InGaAs, 900 - 1700 nm
+1 Qty Docs Part Number - Metric Price Available / Ships
APD110C/M Support Documentation
APD110C/M Avalanche Photodetector, InGaAs, 900 - 1700 nm, Metric

InGaAs High-Speed Avalanche Photodetectors

  • High-Speed Avalanche Photodetector up to 1 GHz
  • Internal SM05 (0.535"-40) Threads for Lens Tube Integration
  • 100 Step Adjustable Gain

Menlo Systems' APD310 InGaAs Avalanche Photodetector provides an extremely light-sensitive alternative to traditional PIN photodiodes and is sensitve 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. 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 O impedance. The detector has an electronic width of 1 MHz to 1 GHz and offers a user-accessible potentiometer providing 100 step gain adjustment. The APD310 has SM05 (0.535"-40) threads for easy integration into Thorlabs' entire family of lens tubes and cage assemblies. 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 tech 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.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
APD310 Support Documentation
APD310 High-Speed Avalanche Detector, InGaAs, 850 - 1650 nm
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