A new photorefractive effect resulting from the interaction of highhyphen;intensity shorthyphen;duration laser pulses with propagating acoustic waves has been found to occur in LiNbO3. The indexhyphen;ofhyphen;refraction change (dgr;n) is proportional to the rf signal and increases sublinearly with the number of laser pulses and as the 1.3 power of the incident laser energy density (J) per pulse. The decay time of dgr;nvaries from a few hours when only green illumination (530 nm) is used to several weeks when combined green and infrared illumination (1060 nm) are used. This acoustophotorefractive effect can be utilized to construct an acoustohyphen;optic memory correlator.
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