OPTICAL OSCILLATION INSIDE PHOTOREFRACTIVE CRYSTAL AND OPTICAL LIMITER
光折变晶体内的光振荡和光学限幅器

A new kind of optical limiter by using the energy transfer of incident beam to oscillation is proposed. The oscillation loops in the shapes of parallelogram and figure-eight were observed simultaneously and separately in the experiment for SBN crystals. The threshold conditions of different kinds of oscillation and the relation of transmissivity to the coupling constant are given. The way to control the oscillation and thus the behaviors of optical limiter are also discussed.