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Soviet Journal of Quantum Electronics

Investigation of phase conjugation as a result of a four-wave interaction of YAG:Er3+laser radiation in organic solvents

Alexander A. Betin, В. А. Каменский, V. P. Novikov

Published Dec 31, 1991• 1 citation
Publisher

Abstract

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.

DOI
10.1070/qe1991v021n12abeh004745

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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.
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Phase conjugation of backward-and forward-wave produced by degenerate four-wave mixing using a nearly resonantly enhanced nonlinearity in four-level organic dye solutions was investigated. The conversion efficiency of 22% had been obtained in a 2.5 X 10-5 - molar solution of Chlorophyll A in methylalcohol with a 5 mm interaction length and a pumping energy of ～ 8 mJ from SH of a Q-switched Nd: YAG. Degene-rate four-wave mixing by two-photon resonant-enhancement in the solution of rhodamine 6G in alcohol was studied. Measurements were performed which described the dependence of nonlinear reflectivities on the molar concentrations of the media and the intensities of the pumping and object waves. Phase conjugation characteristics of forward-wave in four-wave mixing process were theoretically analysed. Experiments have cofirmed the theoretical prediction. The method of quartet degenerate four-wave mixing had been ex-tended to the doublet degenerate case. Using this method image conversion from 1.06 μm to 5320 ? had been realized with a conversion efficiency of 25% in a 5 mm long satu-rable absorber made of organic dye 9740 solution in dichloroethane. Theoretical analy-sis showed that using a medium, which is a near resonant absorber for the infrared object wave but is transparent for the visible reconstruction wave, the conversion efficiency may be well in excess of unity.
A system for phase conjugation of Stokes radiation by a four-wave interaction involving intracavity stimulated Raman scattering (STRS) in a Raman-active medium with a nonresonant nonlinearity. This method can be used in construction of high-power sources of highly directional Stokes radiation on the basis of round-trip STRS amplifiers coupled to a phase-conjugating element. It is shown that an STRS converter utilizing organic liquids and subjected to laser pumping of less than 100 MW/cm2 intensity inside a resonator can ensure a highly efficient phase conjugation with a peak reflection coefficient in excess of unity. Depending on the ratio of the Raman and nonresonant susceptibilities of a medium, there is an optimal value of the coefficient representing the degree of conversion of laser pump radiation into STRS radiation, which ensures the maximum phase conjugation efficiency.
Phase conjugation of backward-and forward-wave produced by degenerate four-wave mixing using a nearly resonantly enhanced nonlinearity in four-level organic dye solutions was investigated. The conversion efficiency of 22% has been obtained in a 2.5×10-5-molar solution of chlorophyll A in methylalcohol with a 5mm interaction length and a pumping energy of ～8mj from SH of a Q-switched Nd:YAG. Degenerate four-wave mixing by two-photon resonant-enhancement in the solution of rhodamine 6G in alcohol was investigated. Measurements were performed which described the dependance of nonlinear reflectivities on the molar concentrations of the media and the intensities of the pumping and object waves. Phase conjugation characteristics of forward-wave in four-wave mixing process were theoretically analysed. Experiments have confirmed the theoretical prediction. The method of quartet degenerate four-wave mixing has been extended to the doublet degenerate casa. Using this method, image conversion from 1.06μm to 5320 A has been realized with a conversion efficiency of 25% in a 5 mm long saturable absorber made of organic dye 9740 solution in diehloroethane. Theoretical analysis shows that using a medium, which is a near resonant absorber for the infrared object wave but transparent for the visible reconstruction wave, the conversion efficiency may be well in excess of unity.