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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Ultraviolet Phase Conjugation And Its Practical Implications

S. L. Shapiro, Robert A. Fisher, B. J. Feldman

Published Sep 15, 1981• 0 citations
Publisher

Abstract

We report the first demonstration of uv phase conjugation. Using a 15 psec, 2660 Å pulse, 0.1% conjugate reflectivities were obtained via degenerate four-wave mixing in 1-mm samples of CS2 mixtures. While pure CS2 did not exhibit the effect, dilution in several uv transmitting solvents opened up a concentration-tunable (2450 Å - 2850 Å) spectral window, allowing the optical Kerr effect to be utilized. Weaker phase conjugation at 2660 Å was also observed in other Kerr media and in saturable absorber media.

DOI
10.1117/12.931736

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Journal of Modern Optics•Jan 1, 1992•3 citations
We report the first demonstration of uv phase conjugation. Using a 15 psec, 2660 Å pulse, 0.1% conjugate reflectivities were obtained via degenerate four-wave mixing in 1-mm samples of CS2 mixtures. While pure CS2 did not exhibit the effect, dilution in several uv transmitting solvents opened up a concentration-tunable (2450 Å - 2850 Å) spectral window, allowing the optical Kerr effect to be utilized. Weaker phase conjugation at 2660 Å was also observed in other Kerr media and in saturable absorber media.
We report the first demonstration of uv phase conjugation. Using a 15 psec, 2660 Å pulse, 0.1% conjugate reflectivities were obtained via degenerate four-wave mixing in 1-mm samples of CS2 mixtures. While pure CS2 did not exhibit the effect, dilution in several uv transmitting solvents opened up a concentration-tunable (2450 Å - 2850 Å) spectral window, allowing the optical Kerr effect to be utilized. Weaker phase conjugation at 2660 Å was also observed in other Kerr media and in saturable absorber media.
We report the first known demonstration of UV phase conjugation. By use of a 15-psec, 2660-A pulse, 0.1% conjugate reflectivities were obtained through degenerate four-wave mixing in 1-mm samples of CS(2) mixtures. Although pure CS(2) did not exhibit the effect, dilution of CS(2) in several UV-transmitting solvents opened up a concentration- tunable (2450-2850 A) spectral window, allowing the optical Kerr effect to be utilized. Weaker phase conjugation at 2660 A was also observed in other Kerr media and in saturable absorber media.
We have performed experimental studies designed to elucidate the parameters which limit the efficiency and fidelity of optical phase conjugate reflection of picosecond laser pulses in transparent Kerr media. The experimental data show that at low pulse energies, the reflectivity follows the expected square dependence on the pulse energies. However, it falls below the square at high energies even though, at these high energies, a phase conjugation efficiency of 300% was observed. We observed a rather strong dependence of the reflectivity on the ratio of pump to probe pulse energy. The quality of phase conjugation decreased at very high pump energies, but could under some conditions be improved by focusing the probe beam into the interaction region. Of the several mechanisms responsible for the decrease in efficiency and fidelity, we find that the predominant ones are pump depletion, small scale self-focusing, and dephasing owing to a difference in energy of the two pump pulses.
A theory of degenerate four-wave mixing in absorbing media is developed in terms of a general nonlinear susceptibility. The predictions of the theory are examined in both high and low reflectivity regimes and the specific nonlinearity-inducing mechanisms of thermally induced refractive index changes, the Kerr effect, and saturable absorption are considered. Such a theory is of particular relevance to degenerate four-wave mixing experiments in the ultraviolet and the predictions of the theory are compared with results obtained from such experiments.