Kopp V I, Fan B, Vithana H K, Genack A Z
Opt Lett. 1998 Nov 1;23(21):1707-9. doi: 10.1364/ol.23.001707.
Low-threshold lasing is observed at the edge of the stop band of a one-dimensional structure-a dye-doped cholesteric liquid-crystal film. The mode closest to the edge has the lowest lasing threshold. The rates of spontaneous and stimulated emission are suppressed within the stop band and enhanced at the band edge. The ratio of right to left circularly polarized spontaneous emission is in good agreement with calculated density of photon states.
在一维结构（掺杂染料的胆甾相液晶薄膜）的禁带边缘观察到了低阈值激光发射。最接近边缘的模式具有最低的激光发射阈值。自发发射和受激发射速率在禁带内受到抑制，而在带边处增强。右旋与左旋圆偏振自发发射的比率与计算得到的光子态密度吻合良好。
