Photoreceivers with fixed gain up to 400kHz

Brief description

The photodetectors in the FWPR, PWPR, and LCA-S series consist of Si-PIN or InGaAs-PIN photodiodes and transimpedance amplifiers for converting even the smallest optical signals into proportional output voltages. They have fixed gains and are optimised for maximum gains at small bandwidths up to 400 kHz.

Features

• Bandwidth up to 400 kHz
• High gain up to 10¹² V/A
• NEP down to 0.7 fW/√Hz
• Si and InGaAs photodiodes for spectral range of 320 to 1700 nm
• 1.035″-40 threaded free space input, compatible with many standard optical systems

Models for the spectral range from 320 to 1100 nm:

Model	FWPR-20-SI-FST	PWPR-2K-SI-FST	LCA-S-400K-SI-FST
Si-PIN photo diode	1.1 × 1.1 mm²	1.2 mm Ø	3.0 mm Ø
Spectral Range	320 - 1100 nm	320 - 1060 nm	320 - 1060 nm
Bandwidth (−3 dB)	DC - 20 Hz	DC - 2 kHz	DC - 400 kHz
Rise Time (10 - 90 %)	18 ms	165 µs	900 ns
Transimpedance Reinforcement	1 × 1012 V/A	1 × 109 V/A 1 × 1010 V/A (switchable)	1 × 107 V/A
Conversion Reinforcement	6 × 1011 V/W	6,4 × 108 V/W 6,4 × 109 V/W (switchable)	5,9 × 106 V/W
NEP	0.7 fW/√Hz	9 fW/√Hz	120 fW/√Hz
Output voltage	-1,6 - +10 V	-1,2 - +10 V	-3 - +10 V
Signal output	designed for high-impedance load, to be terminated with ≥ 100 kΩ
Datasheet

Models for the spectral range from 900 to 1700 nm:

Model	FWPR-20-IN-FST	PWPR-2K-IN-FST	LCA-S-400K-IN-FST
InGaAs-PIN photo diode	0.5 mm Ø	0.5 mm Ø	0.5 mm Ø
Spectral Range	900 - 1700 nm	900 - 1700 nm	900 - 1700 nm
Bandwidth (−3 dB)	DC - 20 Hz	DC - 2 kHz	DC - 400 kHz
Rise Time (10 - 90 %)	18 ms	165 µs	1 µs
Transimpedance Reinforcement	1 × 1011 V/A	1 × 109 V/A 1 × 1010 V/A (switchable)	1 × 107 V/A
Conversion Reinforcement	9,5 × 1010 V/W	1,1 × 109 V/W 1,1 × 1010 V/W (switchable)	9,5 × 106 V/W
NEP	7.5 fW/√Hz	10 fW/√Hz	75 fW/√Hz
Output voltage	-1,6 - +10 V	-1,2 - +10 V	-3 - +10 V
Signal output	designed for high-impedance load, to be terminated with ≥ 100 kΩ
Datasheet

Offset adjustable by potentiometer. Output short-circuit protected. Power supply 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.

Plugs and sockets

FEMTO amplifiers and photoreceivers are supplied with either a BNC or SMA socket as standard, depending on the model. We are happy to fit other plugs and sockets according to your requirements. In addition to BNC, SMA and type N, other types are also available on request. Simply add your request to your quotation enquiry or contact our support team.

Customised products

Do none of the products fulfil your requirements? We offer customer-specific versions of our products, e.g. adapted bandwidth, amplification or optimisation for special signal sources. OEM versions, for example for larger projects and product integrations, are also possible. Our technical support team looks forward to your enquiry. You may also find something suitable among the related products.

High sensitivity and extremely low noise

The photodetectors up to 400 kHz combine Si or InGaAs PIN photodiodes with specially developed, extremely low-noise transimpedance amplifiers that achieve high gain of up to 10¹² V/A. This unique combination results in photodetectors with very high sensitivity and an exceptionally low NEP of at least 0.7 fW/√Hz.

Compatible with optical bench (free space) and fibre optics

The free space inputs (FST) are designed as 1.035″-40 threaded flanges with screw-on coupler rings. It opens up a broad compatibility with optical accessories from various manufacturers, such as lenses, tubes, cage systems, optical adapters etc.

The relatively large-area detectors facilitate focusing in free space applications and ensure high and stable coupling efficiency even when using the optionally available fibre optic adapters.

The photodetectors can easily be converted to a fibre connection (FC, FSMA) thanks to the large detector surface, by simply screwing on optionally available fibre adapters of the PRA series.

All photoreceivers are equipped with UNC 8-32 and M4 threaded holes and can therefore be conveniently and stably integrated into optical systems on standard holders.

Applications

• Fluorescence measurements
• Chromatography
• Partial replacement for photomultiplier tubes (PMTs), avalanche photodiodes (APDs), and liquid nitrogen-cooled germanium photodiodes (FWPR only)
• Spectroscopy, reflection and transmission measurements
• Time-resolved optical pulse and power measurement
• Characterisation of light sources
• Highly sensitive measurements with chopper modulation
• Optical input module (O/E converter) for oscilloscopes, A/D converters, and lock-in amplifiers

Accessories

Power Supply

RF Cable

Fiber-Adapter

Post Adapter Plate

Spanner wrench