Abstract

Study of photorefractive phase conjugate mirror is of great importance on account of various practical applications, such as optical implementation of neural network, associative memories, synchronization of several isolated lasers, interferometry, etc. A double phase conjugate mirror (DPCM) offers more advantages because no coherence between laser pump beams is needed. BSO-type crystals represent an important class of photorefractive materials due to their fast response time? Fiber-like samples have several advantages compared to the bulk crystal.² We present here an experimental investigation of the double phase conjugation and of the fanning effect in fiberlike photorefractive Bi₁₂TiO₂₀ (BTO) crystal supplied by alternating electric field of square-wave form at the wavelength of He-Ne laser (λ = 632.8 nm). It was found that features of photorefraction in fiber-like samples are quite different with bulk crystals.

© 1994 IEEE