Post holder and post not included
The series HCA-S-200M photoreceivers combine fast photodiodes with the proven and outstanding FEMTO HCA current amplifier technology. The HCA-S-200M is available with either a Silicon or InGaAs photodiode covering a spectral range from 320 to 1000 nm and 900 to 1700 nm, respectively. The electrical amplifier gain is 2 x 104 V/A resulting in a maximum conversion gain of 1.9 x 104 V/W at 1550 nm for the InGaAs model. The sophisticated DC coupled multistage amplifier design allows measurements from DC to a maximum bandwidth of 200 MHz corresponding to a minimum rise time of 1.8 ns. With a noise equivalent power (NEP) as low as 5.2 pW/√Hz signals with an optical power in the micro Watt range can be detected without the need for further averaging.
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. For models with detector areas smaller than Ø 0.4 mm, the use of fiber adapters is only recommended to a limited extent, since coupling losses and instabilities can occur. If the focus is on high-precision fiber optic measurements, using FC-models with fixed optical fiber input will usually give the best results.
FST |
FS
|
FC
|
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 | Pic. 3: FC input with permanent/fixed PC/APC coupling |
All HCA-S photo receivers with free space input (FST and FS) 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 |
HCA-S-200M-SI-FST HCA-S-200M-SI-FS HCA-S-200M-SI-FC HCA-S-200M-SI-SMA |
HCA-S-200M-IN-FST HCA-S-200M-IN-FS HCA-S-200M-IN-FC |
Photodiode | 0.8 mm Ø Si-PIN |
0.3 mm Ø InGaAs-PIN (FS and FST models) integrated ball lens (FC model) |
Spectral Range | 320 – 1000 nm | 900 – 1700 nm |
Bandwidth (-3 dB) | DC – 200 MHz | DC – 200 MHz |
Rise/Fall Time (10% - 90%) | 1.8 ns | 1.8 ns |
Transimpedance Gain | 2 x 104 V/A | 2 x 104 V/A |
Max. Conversion Gain | 1.1 x 104 V/W (@ 800 nm) | 1.9 x 104 V/W (@ 1550 nm) |
Min NEP (@ 10 MHz) | 9.4 pW/√Hz (@ 800 nm) | 5.2 pW/√Hz (@ 1550 nm) |
Datasheet | 1.94 MB | 1.16 MB |
Output voltage ±1.2 V (for linear operation @ 50 Ω load). Offset adjustable by potentiometer. Output short-circuit protected. The photoreceivers with free space input come with 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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