Abstract
Considerable improvement of a transient two-beam coupling gain is reported for , 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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