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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

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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40 μm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532 nm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575~588 nm和600~620 nm范围显示了尖锐、分立的随机激光辐射峰,线宽约为0.3 nm。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。

Abstract

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 TEB30A are infused into 40 μm 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 fan-shaped 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.

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中图分类号:TN241;O753+.2

DOI:10.3788/yjyxs20183306.0464

所属栏目:材料与器件

基金项目: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

收稿日期:2018-01-05

修改稿日期:2018-01-17

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乌日娜:沈阳理工大学 理学院,辽宁 沈阳 110159
王 兴:沈阳理工大学 理学院,辽宁 沈阳 110159
杨 帆:沈阳理工大学 理学院,辽宁 沈阳 110159
李业秋:沈阳理工大学 理学院,辽宁 沈阳 110159
岱 钦:沈阳理工大学 理学院,辽宁 沈阳 110159

联系人作者:乌日娜(wurina2007@126.com)

备注:乌日娜(1978-),女,内蒙古海拉尔人,副教授,博士,主要从事光电功能材料及器件方面的研究.

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引用该论文

WU Ri-na,WANG Xing,YANG Fan,LI Ye-qiu,DAI Qin. Realization of random lasing in dye-doped chiral nematic liquid crystal[J]. Chinese Journal of Liquid Crystals and Displays, 2018, 33(6): 464-468

乌日娜,王 兴,杨 帆,李业秋,岱 钦. 染料掺杂手性向列相液晶器件中实现随机激光辐射[J]. 液晶与显示, 2018, 33(6): 464-468

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