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Optics and Spectroscopy

Phase-conjugate reflection by four-wave mixing in the amplifying medium of an Ar + laser

Natalia G. Bykova, Valentina V. Lebedeva, Anatoly I. Odintsov

Published Jun 1, 1982• 1 citation
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High-reflectivity four-wave mixing by gain saturation in a Nd:YAG laser amplifier is demonstrated. With a four-pass geometry, the phase-conjugate reflectivity of a Q-switched pulse (18-ns duration) is ∼2500, and for a long pulse (relaxation oscillation duration ∼100 μs) it is ∼30. Temporal and energy characteristics of the conjugate beam are presented. A phase-conjugate Nd:YAG TEM00 laser resonator is also produced in which the Nd:YAG rod is simultaneously the laser gain medium and the phase-conjugating device.