Tuning and narrowing of the emission spectrum of a dye laser were achieved for the first time when a cholesteric liquid crystal was used as a selective Bragg reflector. The average emission frequency of this laser was a function of the spectral position of the Bragg reflection maximum of the oriented liquid crystal layer. The position of the reflection maximum was varied by altering the temperature.
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Iľchishin et al. (1978) studied this question.