Electrophotochromic gratings in photorefractive Bi_12TiO_20 crystals
- 10 April 1992
- journal article
- Published by Optica Publishing Group in Applied Optics
- Vol. 31 (11) , 1787-1793
- https://doi.org/10.1364/ao.31.001787
Abstract
We present the first experimental demonstration of quasi-permanent holographic recordings in Bi12TiO20 crystals through what is to our knowledge a new electrophotochromic effect. This arises from spatial redistribution of some centers that are different from photorefractive centers. Light diffracted from this photochromic grating records a secondary photorefractive hologram. Interaction between both gratings results in asymmetric polarization properties and reversible electric field enhancement of diffracted beams.Keywords
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