Charge dynamics for holographic gratings in photorefractive materials

Charge dynamics in photorefractive materials for the case in which an index grating is written by interfering light beams is investigated. Of particular interest is the case in which the Debye screening length is not too large. Solutions to the band transport model are found without any assumption of steady state for either the ionized donors or the photocarriers. These results show that the photorefractive grating dynamics are described by a double exponential decay with a fast relaxation rate and a slow relaxation rate. These results are compared with the quasi-steady-state approximation of Kukhtarev. It is shown that, while for barium titanate the quasi-steady-state solution and the non-steady-state solution agree, for bismuth silicon oxide the slow rate can differ by more than 25% relative to the quasi-steady state.

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