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.
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 10^9 V/A, 10^10V/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
COMPATIBILITY WITH OPTICAL BENCH (FREE SPACE) AND FIBER OPTICS
The Femto 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-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
| Model | PWPR-2K-SI | PWPR-2K-IN |
| 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 1010 V/A) |
1.1 x 109 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.