Abstract
It is found that the Avalanche Breakdown far-infrared photodetector responds linearly with incident power, i s ∝ P s, when subjected to a specially coherent signal, for example to the beam of a free electron laser, but responds according to a law, i s ∝ P β s, with 0.5 ⩽ β ⩽ 1.0, when irradiated with incoherent radiation, as from a multimode far-infrared laser. Here the detector signal current is i s and the incident signal intensity is P s.
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