A hologram recording mechanism in photorefractive Bi12TiO20 crystal by different-frequency laser beams in an ac field is studied. The frequency difference between the beams is essentially more than the reverse of the response time of the hologram.
© 1991 Optical Society of America
P. N. Ilinykh, O. P. Nestiorkin, and B. Ya. Zel’dovich, "Nondegenerate two-wave interaction in a photorefractive crystal in an external detecting field," Opt. Lett. 16, 414-416 (1991)