染料掺杂胆甾相液晶激光器的特性研究

Research of dye-doped cholesteric nematic liquid crystal laser characteristic

研制了染料掺杂胆甾相液晶激光器,测试分析了器件激光输出特性。将激光染料DCM、手性剂S-811、液晶TEB30A按一定比例混合,注入摩擦取向的液晶盒中,形成平面态排列的胆甾相液晶激光器件。利用532 nm波段的Nd:YAG脉冲倍频激光泵浦液晶器件,获得了禁带边沿激光输出,测量分析了激光能量阈值特性与激光光斑能量分布特点。液晶激光器在光子禁带边沿607 nm和680 nm处获得激光输出,线宽小于0.5 nm。在液晶器件中,光子禁带边缘处光子态密度最大,此处器件阈值较低,容易产生激光辐射。

Dye-doped cholesteric liquid crystal laser was designed and manufactured, and the output characteristic of the device was measured and analyzed. The cholesteric liquid crystal laser device of planar alignment state texture was prepared by doping laser dye DCM and chiral compound S-811 into nematic liquid crystal TEB30A. By using doubled frequency 532 nm Nd：YAG pulsed laser as pumping source to pump the device, the band edge lasing emission was obtained at 607 nm and 680 nm. The line-width was less than 0.5 nm. Then the energy threshold characteristic of the laser and the energy distribution of the lasing spot were measured and analyzed. In the liquid crystal device, photonic density of states is greatest at the edge of the photonic band gap, threshold is lower and laser radiation is obtained easily.