Features
- Si-PIN and InGaAs-PIN photodiodes
- Wavelength range from 320 to 1700 nm
- Bandwidth from DC to 400 kHz
- Transimpedance gain 107 V/A
- Min. NEP 75 fW/√Hz
| Model | LCA-S-400K-SI-FST | LCA-S-400K-IN-FST |
|---|---|---|
| Photodiode | 3.0 mm Ø Si-PIN | 0.5 mm Ø InGaAs-PIN |
| Spectral Range | 320 - 1060 nm | 900 - 1700 nm |
| Bandwidth (-3 dB) | DC - 400 kHz | DC - 400 kHz |
| Rise/Fall Time (10% - 90%) | 900 ns | 1 µs |
| Transimpedance | 1 x 107 V/A | 1 x 107 V/A |
| Max. Conversion Gain | 5.9 x 106 V/W (@ 920 nm) | 9.5 x 106 V/W (@ 1550 nm) |
| Min NEP (@ 10 kHz) | 120 fW/√Hz (@ 920 nm) | 75 fW/√Hz (@ 1550 nm) |
| Datasheet |  |
|
Output voltage ±10 V max (@ 1 MΩ load). Offset adjustable by trimpot. Output short-circuit protected. Threaded M4 and 8-32 mounting holes for use with standard mounting posts. 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.
A new family of photoreceivers
By combining state of the art photodiodes with the proven and outstanding FEMTO LCA Current Amplifier technology we designed a new family of photoreceivers with a remarkable performance. The LCA-S-400K is available with either a large area Si or InGaAs photodiode covering a spectral range from 320 to 1060 nm and 900 to 1700 nm, respectively. The amplifier transimpedance is 107 V/A resulting in a maximum conversion gain of 9.5 x 106 V/W at 1550 nm for the InGaAs model.
Thanks to the very low-noise behaviour of the transimpedance amplifier, the minimum NEP is only 75 fW/√Hz. This facilitates detection of optical signals in the 100 pW range without additional measures such as averaging or similar, and all this with a bandwidth of 400 kHz.
Compatible with optical bench (free space) and fibre optics
The free space input (FST) is designed as a 1.035″-40 threaded flange with a screw-on coupler ring. It opens up a broad compatibility with optical accessories from various manufacturers, such as lenses, tubes, cage systems, optical adapters etc.
The free-space input can be converted into fibre connections (FC, FSMA) easily by simply screwing on the fibre adapter of the PRA series.
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 fibre optic adapter.
All LCA-S photo receivers are equipped with UNC 8-32 and M4 threaded holes and can therefore be conveniently and stably integrated into optical systems on standard rod holders. The optionally available adapter plate PRA-PAP opens up further mounting options.
Applications
- Spectroscopy
- General purposes opto-electronic measurements
- Optical front-end for oscilloscopes, A/D converters and lock-in amplifiers
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