T. M. Sarukhanyan
The state of polarization is an important feature of any laser emission. The polarization of light is important for the processing of laser beams in polarization-dependent devices such as interferometers, optical amplifiers, optical modulators, etc. In this paper, the polarization of lasing generated from the three-layered cholesteric liquid crystal–dye-doped polymer layer–cholesteric liquid crystal system was investigated experimentally. It was shown that the polarization state of lasing peaks generated from the above-mentioned three-layered system is circular. The polarization of lasing from the dye-doped cholesteric liquid crystalline system is verified experimentally which is also circular. It was shown that the polarization of the lasing from the cholesteric liquid crystal with isotropic defect layer inside coincides with the polarization of lasing from the dye-doped cholesteric liquid crystalline system. For both cases, laser emission has left-hand circular polarization.