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Proceedings Paper

Spectral and lasing characteristics of dye-doped cholesteric liquid crystals as materials for laser projection screens
Author(s): Igor P. Ilchishin
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Paper Abstract

Absorbtion spectra, fluorescence spectra and quantum yields of dyes of various classes in cholesteric liquid crystals (CLC) and in isotropic solutions as well as the thresholds oftheir lasing in CLC were investigated. The increase ofquantum yields of dyes in concentrated CLC-solution in comparison with diluted isotropic ones are established for the first time. It has been shown that neutral phenolenone dyes with voluminose terminal groups which hinder aggregation of their molecules in concentrated solutions. The experimental investigations of the lasing efficiency of a distributed feedback laser (DFB) based on CLC from excitation intensity and optical density of dye in the active layer are presented. The thermal phase grating induced by laser radiation in doped CLC, as it is shown, the high << effective Q>> of the CLC layers are compensated and the lasing efficiency of this lasers are improved.

Paper Details

Date Published: 20 July 2004
PDF: 9 pages
Proc. SPIE 5507, XVI International Conference on Spectroscopy of Molecules and Crystals, (20 July 2004); doi: 10.1117/12.570017
Show Author Affiliations
Igor P. Ilchishin, Institute of Physics (Ukraine)


Published in SPIE Proceedings Vol. 5507:
XVI International Conference on Spectroscopy of Molecules and Crystals
Galyna O. Puchkovska; Tatiana A. Gavrilko; Olexandr I. Lizengevich, Editor(s)

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