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Proceedings Paper

Second harmonic generation in nematic liquid crystals
Author(s): Peter Palffy-Muhoray; K.-M. Hsia; Tamas Kosa
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Paper Abstract

Due to inversion symmetry, uniform nematic liquid crystals do not show second harmonic generation (SHG) in the bulk. The inversion symmetry may be broken by spatial variation of the director field. We have studied SHG in nematic cells with spatially periodic distortions of the director field. Cells were constructed with optically patterned alignment layers on the cell walls, and filled with the liquid crystal E7. Using 35 ps pulses from a mode-locked Nd:YAG laser at 1.06 microns, we observed bulk SHG, and measured the intensity and polarization of the SH signal as a function of angle, pump polarization and temperature. We propose a simple model for the symmetry breaking polarization and the resulting SHG, and consider phase matching in inhomogeneous periodic birefringent media.

Paper Details

Date Published: 11 April 1997
PDF: 7 pages
Proc. SPIE 3015, Liquid Crystal Materials, Devices, and Applications V, (11 April 1997); doi: 10.1117/12.271400
Show Author Affiliations
Peter Palffy-Muhoray, Kent State Univ. (United States)
K.-M. Hsia, Kent State Univ. (United States)
Tamas Kosa, Kent State Univ. (United States)

Published in SPIE Proceedings Vol. 3015:
Liquid Crystal Materials, Devices, and Applications V
Ranganathan Shashidhar, Editor(s)

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