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Letters to the editor

Self-diffraction of CO₂ laser radiation in nematic liquid crystals near a nematic–isotropic liquid phase transition

O. L. Antipov, V. I. Bespalov, A. A. Betin


Abstract: Experimental and theoretical investigations were made of self-diffraction of CO₂ laser radiation in absorbing nematic crystals. A considerable increase in the signal-wave gain occurred as a result of transfer of energy from the pump radiation near a nematic–isotropic liquid phase transition (in this case the absolute gain of a weak infrared wave reached 600%). A theoretical interpretation of the effect was based on a model of a thermal nonlinearity of a nematic liquid crystal near the phase transition.

UDC: 621.373.826

PACS: 42.55.Lt, 42.60.By, 42.70.Df, 42.60.Lh, 42.60.Jf, 42.70.Mp

Received: 21.02.1989

 English version: Soviet Journal of Quantum Electronics, 1989, 19:6, 711–712

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