Features

• 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

 

MEASURING SMALLEST OPTICAL SIGNALS FROM DC TO 2 KHZ

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.

 

COMPATIBILITY WITH OPTICAL BENCH (FREE SPACE) AND FIBER OPTICS

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 detector facilitates optical focusing in free-space applications and ensures a high and stable degree of coupling when using the optionally available fiber optic adapter.

All PWPR-2K photoreceivers feature both UNC 8-32 and M4 tapped holes for mounting on metric and imperial threaded standard posts. The optionally available adapter plate PRA-PAP opens up further mounting options.

PWPR-2K-SI-FS	PWPR-2K-SI-FST
Mounted in vertical position using the integrated tapped holes	Mounted in horizontal position using the optionally available post adapter plate
(PRA-FC, PRA-PAP and post-holder not included in the scope of delivery)

 

 

 

 

Applications

• 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

 

Models	PWPR-2K-SI-FST PWPR-2K-SI-FS	PWPR-2K-IN-FST PWPR-2K-IN-FS
Photodiode	1.2 mm Ø Si-PIN	0.5 mm Ø InGaAs-PIN
Spectral Range	320 - 1060 nm	900 - 1700 nm
Bandwidth (−3 dB)	DC - 2 kHz	DC - 2 kHz
Rise/Fall Time (10 % - 90 %)	165 µs	165 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 Gain	0.64 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)
Datasheet	628 kB	649 kB

Output voltage range up to +10 V. Offset adjustable by potentiometer. Output short-circuit protected. Power supply ±15 V via 3-pin Lemo^® socket. A mating connector is provided with the device. Optional power supply PS-15 available. For further information please view the datasheet or contact FEMTO.