Experimental observation of Nd:YAG laser field-induced nonlinear frustration of selective Bragg reflection in the cholestric liquid crystal

Svetlana G. Lukishova; Ekaterina A. Magulariya; Konstantin S. Lebedev

doi:10.1117/12.240519

20 May 1996 Experimental observation of Nd:YAG laser field induced nonlinear frustration of selective Bragg reflection in the cholestric liquid crystal

Svetlana G. Lukishova, Ekaterina A. Magulariya, Konstantin S. Lebedev

Author Affiliations +

Proceedings Volume 2800, Nonlinear Optical Interactions and Wave Dynamics; (1996) https://doi.org/10.1117/12.240519
Event: International Conference on Coherent and Nonlinear Optics, 1995, St. Petersburg, Russian Federation

Abstract

We have observed lowering of reflectivity (from approximately 85% up to approximately 50 - 70%) of the cholesteric liquid crystal (CLC) mirror under the nonlinear action of circular polarized laser radiation. The possibility is considered of nonthermal but light-field induced helical pitch dilation and untwisting. It should be mentioned that it is the first experiment to our knowledge (the special laser operation was chosen, so that the changes of pitch can be accumulated) where such strong changes of reflectivity can be explained by nonthermal effects. We also observed defocusing of the reflected beam with a near Gaussian spatial profile and changing of the CLC mirror curvature, but we consider that in these experiments thermal effects are more probable.

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Svetlana G. Lukishova, Ekaterina A. Magulariya, and Konstantin S. Lebedev "Experimental observation of Nd:YAG laser field induced nonlinear frustration of selective Bragg reflection in the cholestric liquid crystal", Proc. SPIE 2800, Nonlinear Optical Interactions and Wave Dynamics, (20 May 1996); https://doi.org/10.1117/12.240519

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