Abstract

Results of a detailed theoretical analysis on the detection of phase-modulated optical signals with an arbitrary modulation index (Δ ≷ 1) and modulation frequency (ω/ω0 ≷ 1, where ω0 is the characteristic cutoff frequency) by adaptive photodetectors that are based on photorefractive crystals and the non-steady-state photo-electromotive force are presented. Besides general analytical results, numerical calculations of the output signal form and the amplitude and the phase of its first and second harmonics are given. The main predictions of the theoretical analysis are illustrated by the experimental data obtained for a high-sensitivity cubic photorefractive Bi12SiO20 crystal at the wavelength (λ = 488 nm) of an argon-ion laser.

© 1993 Optical Society of America

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