A transient model of degenerate four-wave mixing in saturable amplifiers is
developed for calculation of the phase-conjugate reflectivity in the
weak-probe-beam limit. Our model takes into account the laser amplification of
all the interacting beams together with the wave-mixing process between the two
counterpropagating pump waves. Experimental investigations are made in a
flash-lamp-pumped Nd:YAG amplifier with nanosecond pulses at 1.06
μm. A reflectivity of 22% is achieved when
all the waves interfere within the laser medium.
© 1994 Optical Society of America
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