Nonlinear light scattering by laser- and dc-field-induced molecular reorientations in nematic-liquid-crystal films

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

We present here a detailed experimental study of nonlinear optical scattering in nematic liquid crystals using low-power cw lasers. The scattering is effected by the phase grating created by two intersecting same-frequency lasers. These lasers interfere spatially to create an index modulation via their reorientation effects on the molecules. When aided by a dc magnetic field, the reorientation and nonlinear responses of the medium are enhanced. We have quantitatively measured the dependence of the diffraction efficiency as a function of the optical intensity and the magnetic field ranging from well below to far above the critical orientation threshold values. The scattering is also analyzed in terms of its dependence on the temperature, sample thickness, and the scattering geometry. The experimental results are in good agreement with theoretical expectations. We also point out some high-intensity effects and applications of this phase grating, e.g., in wave-front conjugation and holographic imaging.

Original languageEnglish (US)
Pages (from-to)1040-1048
Number of pages9
JournalPhysical Review A
Volume25
Issue number2
DOIs
StatePublished - Jan 1 1982

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retraining
light scattering
liquid crystals
scattering
lasers
gratings
wave fronts
conjugation
magnetic fields
modulation
thresholds
geometry
diffraction
molecules
temperature

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

Cite this

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abstract = "We present here a detailed experimental study of nonlinear optical scattering in nematic liquid crystals using low-power cw lasers. The scattering is effected by the phase grating created by two intersecting same-frequency lasers. These lasers interfere spatially to create an index modulation via their reorientation effects on the molecules. When aided by a dc magnetic field, the reorientation and nonlinear responses of the medium are enhanced. We have quantitatively measured the dependence of the diffraction efficiency as a function of the optical intensity and the magnetic field ranging from well below to far above the critical orientation threshold values. The scattering is also analyzed in terms of its dependence on the temperature, sample thickness, and the scattering geometry. The experimental results are in good agreement with theoretical expectations. We also point out some high-intensity effects and applications of this phase grating, e.g., in wave-front conjugation and holographic imaging.",
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Nonlinear light scattering by laser- and dc-field-induced molecular reorientations in nematic-liquid-crystal films. / Khoo, Iam-choon.

In: Physical Review A, Vol. 25, No. 2, 01.01.1982, p. 1040-1048.

Research output: Contribution to journalArticle

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