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An investigation of the phase conjugation of YAG:Er(3+) laser radiation during four-wave mixing in organic solvents

Alexander A. Betin, В. А. Каменский, В. П. Новіков

Published Dec 1, 1991• 0 citations
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The characteristics of four-wave-interaction mirrors utilizing organic solvents were investigated experimentally using YAG:Er3+ laser radiation (λ = 2.94 μm). The highest reflection coefficient of 500% was obtained for benzine at an energy density of 2 J/cm2 under Q-switched conditions. It was found that distortions introduced by inhomogeneous NaCl phase plates could be compensated by phase conjugation. The longitudinal coherence length of the YAG:Er3+ laser radiation was determined from the dependence of the reflection coefficient of a four-wave interaction mirror on the difference between the paths of the signal wave and the parallel pump wave.
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.