楔形盒染料掺杂胆甾相液晶激光器研究

摘要

The wedge cell of cholesteric liquid crystal device is designed and fabricated, and doping PM580 (exciton) in the cholesteric liquid crystal, the laser emission action is studied. There appear a series of parallel wedge edges of dislocation lines and different shapes of domain in the wedge cell. The planar state of alignment is confirmed. A second harmonic Nd:YAG 532 nm laser is adopted as a pump light beam, and then one-dimensional tunable laser radiation is obtained and its wavelength interval is approximately 1 nm and tuning range is about 17 nm. In the processs of interaction between the torques of LC and the surface anchoring of direction film, the pitch elongation takes place. The positon of photonic band gap is changed, so the laser radiation wavelength can be tuned in the band edge.%　　设计制作了楔形盒掺杂激光染料PM580的胆甾相液晶器件,研究了激光辐射行为。在楔形液晶盒中出现了一系列与楔棱平行的向错线和不同规则形状的晶畴,胆甾相液晶形成了平面态排列。采用固体Nd：YAG倍频532 nm波长激光作为抽运光,获得调谐精度约1 nm,调谐范围约17 nm的一维波长可调谐激光器。楔形盒中,液晶扭曲力与取向膜表面锚定力相互平衡的过程中胆甾相液晶螺距伸张,光子禁带位置移动,从而调谐光子禁带边沿出射激光波长。