The Licel Si-Avalanche Photodiode Module consists of the detector head and the power supply unit. The APD module combines a Si/InGaAs-Avalanche Photodiode, TE cooler, temperature controller, preamplifier and XYZ positioner in a single compact module. APD and preamplifier are carefully shielded against RF and noise through the power lines. An external HV supply is included.

Air Cooled Si APD Module

Please download a printable version.
APD User Manual / APD User Manual Digital Control.

Detector module based on Excelitas enhanced Si-Avalanche Photodiodes


  • 0.8, 1.0 or 3mm detector diameter
  • >80% QE @650 nm
  • up to 36 A/W responsivity @ 1060 nm
  • low noise - high gain preamplifier
  • integrated HV supply
  • integrated TE cooler and temperature controller,
  • Temp. stability better 0.5 K
  • integrated power supply
  • thread for 2 inch Thorlabs lens tubes
Image of the APD together with HV supply


  • high sensitivity, high speed measurements @ 500 - 1100 nm
  • high dynamic range detection of near infrared signals
  • (Nd:YAG fundamental 1064nm)
  • lidar
  • fluorescence detection
  • particle counters


Remote Control:

The APD can be remote controlled via Ethernet ( Remote control data sheet). See the Ethernet Connectivity page for a list of available options.

Isolated digital interface

Starting from 2023 we ship for APD modules, which are integrated into detection systems and remote controllable with a isolated digital remote control to break ground loops.

They have a 6 pin Lemo connector

Analog interface

The analog remote control input is a good choice when the remote control is done by user hardware.

The cassette has 4 pin M8 sensor connector

Air Cooled InGaAs APD Module

The Licel InGaAs APD detector has an air cooled TEC package. The 500 µm square detector can be cooled down to -15°C and is packaged using the same form factor as our Si- APD module.

InGaAs Datasheet

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