Considerable improvement of a transient two-beam coupling gain is reported for ${\mathrm{Sn}}_2{\mathrm{P}}_2{\mathrm{S}}_6$ , a photorefractive crystal that possesses two types of movable charge carrier. A gain enhancement occurs if the phase difference of the interacting beams is abruptly changed to π. Enhancement is also achieved with periodic phase variations of zero and π between two discrete states at modulation frequencies lower than the smallest of two reciprocal characteristic times of the space-charge formation.

© 2007 Optical Society of America

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