Brief description
The photodetectors of the HCA-S series consist of Si-PIN or InGaAs-PIN photodiodes and transimpedance amplifiers for converting small optical signals into proportional output voltages. They have fixed gains and are optimised for high bandwidths.
Features
- Bandwidth up to 400 MHz
- Gain up to 105 V/A
- NEP down to 3.5 pW/√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, or FC/PC resp. FC/APC connector
Models for the spectral range from 320 to 1000 nm:
| Model | HCA-S-200M-SI-FST HCA-S-200M-SI-FC |
HCA-S-400M-SI-FST HCA-S-400M-SI-FC |
|---|---|---|
| Si-PIN photo diode | 800 µm Ø | 800 µm Ø |
| Spectral Range | 320 - 1000 nm | 320 - 1000 nm |
| Bandwidth (−3 dB) | DC - 200 MHz | DC - 400 MHz |
| Rise Time (10 - 90 %) |
1.8 ns | 1.0 ns |
| Transimpedance Gain |
2 × 104 V/A | 5 × 103 V/A |
| Conversion Gain |
1,1 × 104 V/W | 2,7 × 103 V/W |
| NEP | 9.4 pW/√Hz | 40 pW/√Hz |
| Output voltage | ± 1.2 V | ± 1.0 V |
| Signal output | designed for 50 Ω load, to be terminated with 50 Ω | |
| Datasheet |  |
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Models for the spectral range from 900 to 1700 nm:
| Model | HCA-S-20M-IN-FST | HCA-S-200M-IN-FST HCA-S-200M-IN-FC |
HCA-S-400M-IN-FST HCA-S-400M-IN-FC |
|---|---|---|---|
| InGaAs-PIN photo diode | 500 µm Ø | 300 µm Ø (FST model) integrated ball lens (FC model) |
300 µm Ø (FST model) integrated ball lens (FC model) |
| Spectral Range | 900 - 1700 nm | 900 - 1700 nm | 900 - 1700 nm |
| Bandwidth (−3 dB) | DC - 20 MHz | DC - 200 MHz | DC - 400 MHz |
| Rise Time (10 - 90 %) |
18 ns | 1.8 ns | 1.0 ns |
| Transimpedance Gain |
1 × 105 V/A | 2 × 104 V/A | 5 × 103 V/A |
| Conversion Gain |
9,5 × 104 V/W | 1,9 × 104 V/W | 4,8 × 103 V/W |
| NEP | 3.5 pW/√Hz | 5.2 pW/√Hz | 24 pW/√Hz |
| Output voltage | ± 1.5 V | ± 1.2 V | ± 1.0 V |
| Signal output | designed for 50 Ω load, to be terminated with 50 Ω | ||
| Datasheet | |
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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.
| Model | HBPR-100M-60K-IN-FST HBPR-100M-60K-IN-FS HBPR-100M-60K-IN-FC |
|---|---|
| 10 mW on each photo diode | |
| Low Pass Filter | Full bandwidth switchable to 20 MHz (upper cut-off frequency) |
| High pass filter (AC coupling) | DC coupling switchable to AC (10 Hz lower cut-off frequency) |
| Signal output voltage | ±1.0 V at 50 Ω load (for linear gain and low harmonic distortion), maximum ±2.0 V at 50 Ω load |
| Monitor outputs | transimpedance gain 1000 V/A, bandwidth DC - 10 MHz, output voltage 0 ... +10 V (@ ≥100 kΩ load) |
| Supply voltage / Supply current | ±15 V (±14.5 V ... ±16.5 V) -90 / +120 mA typ. |
| Case | 80 x 80 x 30.5 mm (L x W x H) Weight FC models 350 g (0.77 lbs), weight FS/FST models 410 g (0.9 lbs) |
High bandwidth and extremely low noise
The photodetectors combine Si or InGaAs PIN photodiodes with specially developed, low-noise transimpedance amplifiers that achieve gain of up to 105 V/A. This unique combination results in photodetectors with high bandwidth and an exceptionally low NEP down to 3.5 pW/√Hz at bandwidths from DC up to 400 MHz.
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.
From approximately 400 µm Ø and below, coupling efficiency may decrease when using the adapters. If coupling efficiency is critical, we recommend models with FC connections.
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
- Spectroscopy
- Fast pulse and transient measurements
- Optical triggering
- Test of digital fibre-optic systems
- Optical front-end for oscilloscopes and A/D converters
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