Abstract
Spectral and laser characteristics of impurity steroidal cholesteric liquid crystals (CLC) with helical structure defects were studied. It is established that in the transmission spectra of defective CLC structures there is a local dip in the center of the selective reflection (SR) band for linear polarization of light. The spectra of laser generation in defective structures of CLC of different types have been studied and it has been shown that they are located within the dip in the transmission spectra, which allows interpreting these defects as a phase jump in the helical structure of CLC. The obtained experimental data are compared with the theoretical model of laser generation in CLC with helical structure defects.
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