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.