Laser generation thresholds of the cholesteric liquid crystal layer

The laser threshold of the eigenmodes in cholesteric liquid crystal (CLC) cells are calculated. The influence of gain on light localization was investigated. The influence of absorption and gain on the light energy density in the CLC layer both at isotropic and anisotropic absorption and gain were investigated for the first time. The calculated threshold values were compared with analytical expression for laser thresholds obtained under the condition ImK<<1/d, where d is the CLC layer thickness, and K is the resonance wave vector.