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.
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