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Proceedings Paper

Reflective nonlinearity of nonabsorbing cholesteric liquid crystal mirrors driven by pulsed high-repetition-rate laser radiation
Author(s): Svetlana G. Lukishova; Konstantin S. Lebedev; Ekaterina A. Magulariya; Sergey V. Belyaev; Nicolay V. Malimonenko; Ansgar W. Schmid
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Paper Abstract

A light-induced drop in the chiral reflection coefficient of a nonabsorbing chiral nematic (cholesteric) liquid-crystal mirror is observed experimentally in the region of selective reflection under the action of a high-repetition-rate, high- power laser beam, circularly polarized. The independence of the effect from the average power density (and its dependence only on the peak power density) allow it to be attributed to an increase in the pitch of the cholesteric helix to such a degree that it is completely unwound in the strong field of the light wave, an effect previously observed only in static and low-frequency electric and magnetic fields. The kinetics of this first experimental observation of a chiral helix unwinding by the optical field, is a step changing of the reflectivity of the cholesteric liquid-crystal mirror in the strong field of the light wave over the time under the action of high- repetition-rate, pulsed, laser radiation. On account of the specially chosen irradiation conditions, the changes produced in the pitch of the helix by the field of the light wave can be accumulated over time, so that an athermal mechanism can be invoked to explain the nonlinear reflectivity drop of a cholesteric mirror.

Paper Details

Date Published: 14 October 1999
PDF: 9 pages
Proc. SPIE 3800, Liquid Crystals III, (14 October 1999); doi: 10.1117/12.365802
Show Author Affiliations
Svetlana G. Lukishova, Institute of Radioengineering and Electronics (Russia)
Konstantin S. Lebedev, Institute of Radioengineering and Electronics (Russia)
Ekaterina A. Magulariya, Institute of Radioengineering and Electronics (Russia)
Sergey V. Belyaev, Institute of Organic Intermediates and Dyes NIOPIK (Russia)
Nicolay V. Malimonenko, Institute of Organic Intermediates and Dyes NIOPIK (Russia)
Ansgar W. Schmid, Univ. of Rochester (United States)


Published in SPIE Proceedings Vol. 3800:
Liquid Crystals III
Iam-Choon Khoo, Editor(s)

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