HCA-S-200M,200 MHZ PHOTORECEIVER SERIES-FEATURES

1. Si-PIN and InGaAs-PIN photodiodes

2. Wavelength range from 320 to 1700 nm

3. Bandwidth from DC to 200 MHz

4. Max. conversion gain 1.9 x 104 V/W

5. Min. NEP 5.2 pW/√Hz

6. Free space or fiber optic input

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 ? 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.

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.

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.