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Low noise photoreceivers


A New Family of Photoreceivers

By combining state of the art Si and InGaAs photodiodes with the proven and outstanding FEMTO LCA Current Amplifier technology we designed a new family of photoreceivers with a remarkable performance. The LCA-S-400K is available with either a large area Si or InGaAs photodiode covering a spectral range from 400 to 1050 nm and 900 to 1700 nm, respectively. The amplifier transimpedance is 10V/A resulting in a maximum conversion gain of 9.5 x 10V/W at 1550 nm for the InGaAs model. Due to the low noise performance of the transimpedance amplifier the minimum NEP is as low as 75 fW/√Hz which allows for detection of optical signals in the nanoWatt range without further averaging.
  • Spectroscopy
  • General Purpose opto-electronic measurements
  • Optical Front-End for Oscilloscopes, A/D Converters and Lock-In Amplifiers


Photoreceivers - Low Noise

  Click Part # to view pdf datasheet
Model LCA-S-400K-SI LCA-S-400K-IN
Spectral Range 400 ... 1100 nm 900 ... 1700 nm
Bandwidth DC ... 400 kHz DC ... 400 kHz
Rise /Fall-Time (10% - 90%) 1 μs 1 μs
Transimpedance Gain 1 x 107 V/A 1 x 107 V/A
Max. Conversion Gain 6.2 x 106 V/W (@ 900 nm) 9.5 x 106 V/W (@ 1550 nm)
Min NEP (@ 10 kHz) 130 fW/Hz (@ 900 nm) 75 fW/Hz (@ 1550 nm)
Saturation Power 1.6  μW  (@ 900 nm) 1  μW  (@ 1550 nm)
Detector Si PIN, Ø2.5 mm InGaAs PIN, 0.5 mm Ømin
Input Free Space, 25 mm Ø Flange
Output BNC
Output Voltage Range + 10 V @ > 1 MΩ Load
Power Requirements + 15 V, + 15 mA Typ.
Low Noise Input/Output Cable available: CAB-LN1 Low Noise Cable

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 (pdf)

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