Time evolution of the photorefractive phase conjugation process in BaTiO3

Abstract The kinetics of the phase conjugate beam generated by standard four-wave mixing in a BaTiO 3 crystal has been investigated by means of an accurate numerical simulation. The transmission grating configuration has been considered and depletion of pumps was allowed. Special care has been taken in using suitable parameters for this material and consequently for the coupling coefficients γ and grating response times T . The influence on the reflectivity of the beam intensity ratios and coupling coefficients has been analysed. Oscillating as well as monotonic increasing kinetics has been found depending on the values of the coupling coefficients and the pump ratio. A comparison between the undepleted and depleted pump cases is performed finding that reflectivity oscillations are more pronounced for higher coupling coefficients and when the pumps were not depleted. Some comments on the origin of the oscillations will be presented.

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