Post holder and post not included
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 behavior 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.
The free space input is designed as a 1.035"-40 threaded flange with a screw-on coupler ring (FST) or as a 25 mm round flange without thread (FS). Both types open up broad compatibility with optical accessories from various manufacturers, such as lenses, tubes, cage systems, optical adapters etc.
The FST free-space input can be converted into fiber connections (FC, FSMA) easily by simply screwing on the fiber 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 fiber optic adapter.
FST |
FS
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Pic. 1: FST input flange with 1.035"-40 external thread and coupler ring with internal thread | Pic. 2: FS input with 25 mm round flange |
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.
Models |
LCA-S-400K-SI-FST LCA-S-400K-SI-FS |
LCA-S-400K-IN-FST LCA-S-400K-IN-FS |
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 Gain | 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 |
735 kB | 738 kB |
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.
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FEMTO® Messtechnik GmbH
Klosterstraße 64
10179 Berlin
Germany
Phone: +49-(0)30-280 4711-0
Fax: +49-(0)30-280 4711-11
Email: info@femto.de
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