液晶与显示, 2017, 32 (11): 853, 网络出版: 2017-12-01
基于液晶/聚合物光栅选频的高效率有机半导体激光器
High efficiency organic semiconductor laser using a liquid crystal/polymer grating as an oscillation cavity
有机半导体激光器 液晶/聚合物光栅 分布反馈 organic semiconductor laser liquid crystal/polymer grating distributed feedback
摘要
报道了一种基于液晶/聚合物光栅选频的高效率有机半导体激光器的制备方法。首先在一片玻璃基板上旋涂有机半导体荧光薄膜MEH-PPV作为增益介质, 然后在其上通过光场中的定域光聚合制备液晶/聚合物光栅, 形成分布式反馈(DFB)有机半导体激光器。激光出射阈值0.32 μJ/pulse, 斜率转化效率高达7.8%, 呈现良好的s偏振特性。采集了激光束的光斑, 轮廓清晰, 呈现扇形结构。通过改变光栅周期, 实现了53.4 nm激光出射范围。本工作为新型有机激光器的制备提供了有益的指导和借鉴意义。
Abstract
We reported a fabrication technique of a high efficiency organic semiconductor laser device, which used a liquid crystal/polymer grating as an oscillation cavity. To fabricate a distributed feedback (DFB) organic semiconductor laser, the active medium poly[-methoxy-5-(2'-ethyl- hexyloxy)-1,4-phenylene- vinylene] (MEH-PPV) film was spin-coated on a piece of clean glass plate, and then a liquid crystal/polymer grating was fabricated on the MEH-PPV film via localized photo polymerization under an optical interference field. The lasing threshold was 0.32 μJ/pulse, and the conversion efficiency was as high as 7.8%. The lasing beams showed good character in s-polarization. The lasing beam pattern was collected by a digital camera, which showed a fan-shaped geometry. The 53.4 nm lasing range was obtained by varying the grating period. The high efficiency organic semiconductor laser in this work provides guidance for fabricating a novel organic laser device.
刘明欢, 李大禹, 姚丽双, 刘永刚, 彭增辉, 曹召良, 宣丽. 基于液晶/聚合物光栅选频的高效率有机半导体激光器[J]. 液晶与显示, 2017, 32(11): 853. LIU Ming-huan, LI Da-yu, YAO Li-shuang, LIU Yong-gang, PENG Zeng-hui, CAO Zhao-liang, XUAN Li. High efficiency organic semiconductor laser using a liquid crystal/polymer grating as an oscillation cavity[J]. Chinese Journal of Liquid Crystals and Displays, 2017, 32(11): 853.