Compare Model Drawings, CAD & Specs Wavelength Range Maximum Conversion Gain Peak Responsivity NEP Thread Type Availability Price
300-1050 nm 9.4x106 V/W 0.5 A/W 0.25 pW/√Hz 8-32
300-1050 nm 9.4x106 V/W 0.5 A/W 0.25 pW/√Hz M4
900-1700 nm 18.8x106 V/W 1.0 A/W 0.19 pW/√Hz 8-32
900-1700 nm 18.8x106 V/W 1.0 A/W 0.19 pW/√Hz M4


  • Detector Diameter
    2001: 0.9 mm
    2011: 0.3 mm
  • 3 dB Bandwidth
    DC to 200 kHz
  • Optical Input
    Free Space
  • Detector Material
    2001: Silicon
    2011: InGaAs
  • Detector Type
  • Maximum Transimpedance Gain
    18.8x106 V/A
  • Rise Time
    2 µs
  • Saturation Power
    2001: 10 mW @ 850 nm
    2011: 10 mW @ 1600 nm
  • Maximum Pulse Power
    1 W
  • Output Connector
  • Output Impedance
    16 Ω
  • Power Requirements
    Two internal 9V batteries


Silicon or InGaAs Versions

The silicon photodetector version (2001) has a 0.9 mm diameter PIN detector that provides wavelength coverage from 300-1050 nm.  The InGaAs photodetector version (2011) has a 0.3 mm diameter PIN detector that provides wavelength coverage from 900-1700 nm.

Adjustable high-pass and low-pass filters

Independent control of the low and high-frequency corners allows you to reject unwanted noise effectively. The single-pole filters provide a slope of –6 dB/octave with less than 90° phase shift. The DC÷30 setting prevents your signal from going off-scale due to DC amplitude fluctuations, without attenuating fast signals. The high-pass filter can be adjusted to eliminate residual 60-Hz noise, and the independent low-pass filter can be set to dampen noisy signals. The upper left knob adjusts the low-frequency corner and the upper right knob adjusts the high-frequency corner. The corner frequency increases by a factor of three with each full clockwise turn. The photoreceivers have ten settings for each frequency corner, creating a wide variety of frequency responses.

Tiny Jack for Height Adjustment

Our Model 9201 Tiny jack is especially useful for aligning the height of this free space optical receiver to the optical beam.

Variable-gain Transimpedance Amplifier

Variable gain of up to 90 dB in 10-dB steps gives you a useful input range from 1 pW to 10 mW. For small signals requiring 80-dB or greater gain, the maximum bandwidth is reduced from 200 kHz to 20 kHz.

Flexibility & High Performance for a Wide Range of Applications

These photoreceivers can be used for many different applications, including aligning fibers in high-speed-photodetector test and pigtailing setups. They can also be employed as low-noise, DC-coupled photoreceivers/preamplifiers in servo-control systems requiring near-zero phase shifts at up to 100 kHz. Or they can be used in lock-in amplifier systems to take advantage of their shot-noise-limited performance and 90-dB maximum gain. And by correlating their output voltages to a calibrated power meter, these photoreceivers can also serve as sensitive power sensors.

Model 2001-FC photoreceiver used in conjunction with Model 9131 fiber aligner to optimize the coupling efficiency of incoming laser light into an optical fiber.