Nanosecond Selfdiffraction Electrogyration in the crystal of Bi12TiO20 (BTO)

Abstract

Recently there has been considerable current interest in studies of photorefractive materials. It is mainly due to ample prospects of their applications in the wave-front conjugation, optical data processing, laser-emission control, optical amplification of images, adaptive holographic interferometry and so on. However write an erase times in these materials, typically miliseconds to seconds under continuous wave illumination, are slower required for many applications. For this reason, investigations of such well-known photorefractive substances as BaTiO3,Bi12TiO20 and Bi12GeO20 have been extended to the case of pulse pumping in the nanosecond and picosecond ranges. The obtained results indicated that the photorefractive effect can be observed in the nanosecond range as well, though the corresponding efficiency is lower than that achieved under continuous wave pumping.