Applications
Spectroscopy
Fast Pulse and Transient Measurements
Optical Triggering
Optical Front-End for Oscilloscopes and A/D Converters

Si and InGaAs Photodiodes
Wavelength Range from 320 to 1700 nm
Bandwidth from 10 kHz up to 2 GHz
Max. Conversion Gain 4.8 x 103 V/W
Min. NEP approx. 14 pW/√Hz

FEMTO´s GHz Technology
By combining state of the art photodiodes with the proven and outstanding FEMTO GHz amplifier technology we designed a new family of photoreceivers with a remarkable performance. The HSA-X-S offers an upper bandwidth limit of 2 GHz. Two models with either a fast Si or InGaAs photodiode cover a spectral range from 320 to 1000 nm and 850 to 1700 nm, respectively. Due to the sophisticated amplifier design the minimum NEP is just 14 pW/√Hz at a transimpedance of 5 x 103 V/A. This allows for the measurement of optical power levels in the µW range with GHz speed. For the HSA-X-S-1G4-SI with silicon photodiode the effective active diameter is a remarkably large 0.8 mm due to the use of a ball lens in front of the detector chip.

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