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.
© 1992 Optical Society of America
A. A. Kamshilin, J. Frejlich, and P. M. Garcia, "Electrophotochromic gratings in photorefractive Bi12TiO20 crystals," Appl. Opt. 31, 1787-1793 (1992)