Image processing by four-wave mixing in photorefractive GaAs

Abstract

Three image processing experiments were performed by degenerate four-wave mixing in photorefractive GaAs. The experiments were imaging by phase conjugation, edge enhancement, and autocorrelation. The results show that undoped, semi-insulating, liquid-encapsulated Czochralski-grown GaAs crystals can be used as effective optical processing media despite their small electro-optic coefficient.

Четырехволновое взаимодействие на фазово-амплитудных голографических решетках в фоторефрактивном пьезокристалле класса симметрии 43m

“…Наряду с исследованиями закономерностей обращения волнового фронта в фоторефрактивных полупроводниках изучаются [8,9] возможности использования таких кристаллов в устройствах, предназначенных для обработки изображений и в оптических генераторах. В [8] представлены результаты экспериментов по об-388 В.Н. Навныко ращению волнового фронта и обработке изображений.…”

“…2p1p + σ 2p1p )E 1p + (−κ 2p1s + σ 2p1s )E 1s + (κ 2p3p + σ 2p3p )E 3p + (κ 2p3s + σ 2p3s )E 3s + (κ 2p4p + σ 2p4p )E 4p + (κ 2p4s + σ 2p4s )E 4s − α 2 E 2p ,(5) Оптика и спектроскопия, 2022, том 130, вып. 3 + (κ 3s 4p + σ 3s 4p )E 4p + (κ 3s 4s + σ 3s 4s )E 4s − α 3 E 1s ,(8) …”

Photorefractive two-wave mixing in semiconductors of the 4¯3mspace group in general spatial orientation

“…Since the discovery of the photorefractive efFect in III-V [1,2] and II-VI [3] compound semiconductors, applications of this effect are considered in information transmission [4] and processing [5], beam cleanup [6), laser system design 7], or characterization of semiconductor materials [8,9] using two-wave mixing (TWM) and four-wave mixing (FWM) schemes. High gain coefficients were recently obtained in GaAs [10] and InP [11,12] and used in self-starting oscillators [13,14], in analogy to earlier experiments with photorefractive oxides.…”