ERASURE OF PHOTOREFRACTIVE GRATINGS IN BARIUM-TITANATE

An analytical solution of the light-induced decay of the photorefracti ve gratings from the charge transport equations with shallow and deep traps is presented. It is predicted that the light-induced decay curve is biexponential, and a superposition of the shallow- and deep-trap d ecays in the special case is suggested. The prediction is verified in the light-induced photorefractive grating erasure experiments. The era sing intensity dependence of photoconductivity of the BaTiO3 sample is also presented. (C) 1994 American Institute of Physics.