Combining state of the art photodiodes with proven and outstanding FEMTO GHz amplifier technology a new family of photoreceivers with a remarkable performance has been designed. 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 10^3 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 diametre is a remarkably large 0.8 mm due to the use of a ball lens in front of the detector chip.

Applications include spectroscopy, fast pulse measurements, optical triggering.