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Series PWPR-2K


  • Ultra-low noise, NEP ≤ 10 fW/√Hz
  • Si and InGaAs models cover the wavelength range from 320 to 1700 nm
  • Bandwidth DC to 2 kHz
  • Transimpedance gain switchable 109 V/A, 1010 V/A
  • Free-space input 1.035″-40 threaded, alternatively 25 mm diameter unthreaded
  • Easily convertible to fiber optic input (FC and FSMA) with optionally available screw-on adapters


In addition to precise and fast cw-measurements the relatively large bandwidth from DC to 2 kHz also allows time-resolved and modulated measurements. Particularly the combination with lock-in amplifiers results in ultra-sensitive measurement systems being almost immune to disturbances from external sources. In this way the PWPR-2K can easily detect optical powers from about 100 fW up to 10 nW.


The PWPR-2K photoreceivers are factory equipped with an optical free-space input. There is the choice between a 1.035″-40 threaded flange (FST) and a 25 mm unthreaded flange (FS). Both types offer a broad compatibility with optical standard accessories like tubes, lenses, cage systems and optical adapters from various manufacturers. The threaded free-space input (FST) e.g. can be easily converted to an optical fiber input by screwing the optionally available fiber adapters (PRA-FC and PRA-FSMA) on it.

The relatively large area detectors make optical alignment easy in free-space applications and ensure a very high and stable coupling efficiency when using the optionally available fiber optic adapters PRA-FC and PRA-FSMA.

All PWPR-2K photoreceivers feature both UNC 8-32 and M4 tapped holes for mounting on metric and imperial threaded standard posts.

PWPR-2K input options: (PRA-FC, PRA-PAP and post-/holder not included in the scope of delivery)

PWPR-2K-SI-FS mounted in vertical position using the integrated tapped holes
PWPR-SI-FST mounted in horizontal position using optionally available post adapter plate


  • Spectroscopy, reflection and transmission measurements
  • Time resolved optical pulse and power measurements
  • Characterization of light sources
  • Highly sensitive applications using chopper modulation
  • Optical front-end for oscilloscopes, A/D converters and lock-in amplifiers

Photodiode1.2 mm Ø Si-PIN0.5 mm Ø InGaAs-PIN
Spectral Range320 ... 1060 nm900 ... 1700 nm
Bandwidth (-3 dB)DC ... 2 kHzDC ... 2 kHz
Rise/Fall Time (10% - 90%)165 µs165 µs
Transimpedance Gain (switchable)1 x 109 V/A
1 x 1010 V/A
1 x 109 V/A
1 x 1010 V/A
Max. Conversion Gain0.64 x 109 V/W
(@ 900 nm, gain 109 V/A)
0.64 x 1010 V/W
(@ 900 nm, gain 1010 V/A)
1.1 x 109 V/W
(@ 1580 nm, gain 109 V/A)
1.1 x 1010 V/W
(@ 1580 nm, gain 1010 V/A)
NEP (@ 100 Hz)9 fW/√Hz
(@ 900 nm)
10 fW/√Hz
(@ 1580 nm)
Output voltage range up to +10 V. Offset adjustable by potentiometer. Output short-circuit protected. Power supply ±15V 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.
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