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High Speed Photoreceivers – up to 200 MHz

  • Si and InGaAs Photodiodes
  • Wavelength Range from 320 to 1650 nm
  • Bandwidth from Real DC to 200 MHz
  • Max. Conversion Gain 2 x 10V/W
  • Min. NEP approx. 6 pW/√Hz

Photoreceivers with high sensitivity at high bandwidth

The series HCA-S-200M Photoreceivers combine fast photodiodes with the proven and outstanding FEMTO HCA Current Amplifier technology. The HCA-S-200M is available with either a fast large area Si or InGaAs photodiode covering a spectral range from 320 to 1000 nm and 900 to 1650 nm, respectively. The amplifier transimpedance is 2 x 10V/A resulting in a maximum conversion gain of 2 x 104 V/W at 1550 nm for the InGaAs model. The sophisticated DC coupled multi-stage amplifier design allows measurements from DC to a maximum bandwidth of 200 MHz corresponding to a minimum rise-time of 1.8 ns. With a NEP as low as 6 pW/√Hz signals with an optical power in the micro-Watt range can be detected without the need for further averaging.

Customized Photoreceivers
Every application is different with its individual requirements for bandwidth, gain and responsivity. Therefore FEMTO offers customized photoreceivers with optimized specifications for a great variety of applications in addition to the standard product portfolio. After a detailed analysis we offer individual solutions at very reasonable prices and already in single quantities.

More information on custom photoreceivers.


  • Spectroscopy
  • Fast Pulse and Transient Measurements
  • Optical Triggering
  • Optical Front-End for Oscilloscopes, A/D Converters and Ultra Fast Lock-In Amplifiers


Spectral Range320 ... 1000 nm900 ... 1700 nm
Bandwidth (-3dB)DC ... 200 MHzDC ... 200 MHz
Rise/Fall Time (10% - 90%)1.8 ns1.8 ns
Transimpedance Gain2 x 104 V/A2 x 104 V/A
Max. Conversion Gain1.1 x 104 V/W (@ 800 nm)1.9 x 104 V/W (@ 1550 nm)
Min NEP (@ 1 MHz)9.3 fW/√Hz (@ 800 nm)5.4 fW/√Hz (@ 1550 nm)
Saturation Power110  μW  (@ 800 nm)60  μW  (@ 1550 nm)
DetectorSi PIN, Ø 0.8 mmInGaAs PIN, Ø 0.3 mm
InputFree Space, 25 mm Ø Flange
Output50 MΩ, BNC
Output Voltage Range ± 1.7 V @ > 50 MΩ Load
Power Requirements± 15 V, ± 60 mA Typ.
CAB-LN1 Low Noise Input/Output Cable available for frequencies up to 1MHz

Threaded M4 and 8-32 holes for mounting on standard posts. 25 mm Ø flange compatible with microbench systems. Offset adjustable by trimpot. Fiber optic input optional. Output short-circuit protected. Power supply via 3-pin LEMO socket. A mating connector is provided with the device.  Optional power supply PS-15 is available. For further information please view the datasheet.
FEMTO Product Catalog

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