Compare Model Drawings, CAD & Specs Wavelength Range Maximum Conversion Gain Peak Responsivity NEP Thread Type Availability Price
300-1050 nm 9.2x106 V/W 0.5 A/W 0.68 pW/√Hz 8-32
300-1050 nm 9.2x106 V/W 0.5 A/W 0.68 pW/√Hz M4
900-1700 nm 18.4 x 106 V/W 1.0 A/W 0.34 pW/√Hz 8-32
900-1700 nm 18.4 x 106 V/W 1.0 A/W 0.34 pW/√Hz M4


  • Detector Diameter
    2051: 0.9 mm
    2053: 0.3 mm
  • 3 dB Bandwidth
    10 MHz, 5 MHz, 150 kHz
    (measured at low-, medium-, and high-gain settings)
  • Detector Material
    2051: Silicon
    2053: InGaAs
  • Detector Type
  • Maximum Transimpedance Gain
    18.4x106 V/A
  • Rise Time
    80 ns
  • Saturation Power
    2051: 10 mW @ 850 nm
    2053: 10 mW @ 1600 nm
  • Damage Threshold
    10 mW
  • Output Connector
  • Output Impedance
    16 Ω
  • Power Requirements
    ±15 VDC or 9-V Battery


Silicon or InGaAs Versions

Silicon models (2051) provide wavelength coverage from 300-1050 nm, and InGaAs models (2053) provide coverage from 900-1700 nm.

Typical responsivity of the photodetector in Models 2051 (blue) and 2053 (black)

10 MHz Versions of our Popular 200 kHz Photoreceivers

In response to customer requests, we’ve extended the bandwidth of our popular 200 kHz photoreceivers to 10 MHz to provide faster photodetection for our customers.

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 10 MHz to 1 MHz.

Adjustable High and Low Pass Filters

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.

Flexibility for a Wide Range of Applications

The flexibility and high performance of these photoreceivers means that they can be used in a wide range of applications. Use them as low-noise DC-coupled photoreceivers/preamplifiers in servo-control systems requiring near-zero phase shifts. Or use them in lock-in amplifier systems to take advantage of their shot-noise-limited performance and 90-dB maximum gain.