Instruments for detection of infrared laser radiation pulses based on the photon drag of carriers in semiconductors

Fast-response uncooled far-infrared detectors were developed on the basis of the photon drag of carriers in semiconductors. The responsivity, time resolution, and noise immunity of these detectors were investigated from the point of view of optimization of these parameters. Detectors without (type FP) and with (type FPU) amplifiers were built and described. These were characterized by a high time resolution (≥7×10^–10 sec), a wide power range (10–4×10⁸ W), and a high degree of noise immunity. The detectors were calibrated for CO₂ laser radiation. Two models with amplifiers (type FPU-50 and FPU-100) had a set of interchangeable detectors, which made it possible to measure radiation powers from 10 to 2×10⁶ W with the same instrument.