Light-induced nonlinear bleaching of the CLC film under the conditions of selective reflection

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

doi:10.1117/12.239211

29 April 1996 Light-induced nonlinear bleaching of the CLC film under the conditions of selective reflection

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

Proceedings Volume 2795, Nonlinear Optics of Liquid and Photorefractive Crystals; (1996) https://doi.org/10.1117/12.239211
Event: Nonlinear Optics of Liquid and Photorefractive Crystals, 1995, Ai-Danil, Crimea, Ukraine

Abstract

We have observed lowering of reflectivity (from approximately 90 to 95% up to approximately 50 - 70%) of the cholesteric liquid crystal (CLC) mirrors 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 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.

Citation Download Citation

Svetlana G. Lukishova, Konstantin S. Lebedev, and Ekaterina A. Magulariya "Light-induced nonlinear bleaching of the CLC film under the conditions of selective reflection", Proc. SPIE 2795, Nonlinear Optics of Liquid and Photorefractive Crystals, (29 April 1996); https://doi.org/10.1117/12.239211

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