染料掺杂手性向列相液晶器件中实现随机激光辐射  

Realization of random lasing in dye-doped chiral nematic liquid crystal

作　　者：乌日娜[1] 王兴 杨帆 李业秋[1] 岱钦[1] WU Ri -na , WANG Xing, YANG Fan, LI Ye- qiu, DAI Qin(College of Mathematics and Physics, Shenyang Ligong University, Shenyang 110159, Chin)

机构地区：[1]沈阳理工大学理学院,辽宁沈阳110159

出　　处：《液晶与显示》2018年第6期464-468,共5页Chinese Journal of Liquid Crystals and Displays

基　　金：国家自然科学基金(No.61705145);辽宁省高校杰出青年学者成长计划(No.LJQ2015093);辽宁省自然科学基金项目(No.201602649);沈阳市科技计划项目(No.F17-33-6-00);沈阳理工大学激光与光信息辽宁省重点实验室开放基金资助课题~~

摘　　要：设计制作了染料掺杂手性向列相液晶器件,研究了其随机激光辐射行为。均匀混合激光染料DCM和PM597、手性剂S-811、向列相液晶TEB30A,注入无摩擦取向的40μm液晶盒,制成焦锥织构态的手性向列相液晶激光器件。采用固体Nd:YAG倍频532nm波长的脉冲激光作为抽运光泵浦样品。掺杂激光染料PM597和DCM的液晶器件分别在575～588nm和600～620nm范围显示了尖锐、分立的随机激光辐射峰,线宽约为0.3nm。探测了器件在不同方向上的激光辐射谱,在与样品表面夹角约为45°～150°的范围内均能探测到随机激光。在器件中,手性向列相液晶焦锥织构态对光的强散射作用是随机激光产生的主要原因。A device of dye-doped chiral-nematic liquid crystal laser is prepared,and the random laser mechanism is analyzed.A focal conic state is achieved after mixing laser dyes DCM and PM597.Chiral compound S-811 and nematic liquid crystal TEB30 Aare infused into 40μm cells with no rubbing treatment,respectively.A Nd∶YAG pulsed solid-state laser with a wavelength of 532 nm is used as pump source.Both cells emit a discrete and sharp random laser with a line-width of 0.3 nm.The laser from the PM597 doped cell has a wavelength region of 575～588 nm,and the laser from the DCM doped cell has a wavelength region of 600～620 nm.The random laser can be detected in a fanshaped region with an angle from 45° to 150° to the cell surface.In the device,the strong scattering of chiral conical texture of liquid crystal in chiral nematic liquid crystal is the main reason of random lasing.

关 键 词：手性向列相液晶 随机激光 焦锥织构态 

分 类 号：TN241[电子电信—物理电子学] O753.2[理学—晶体学]