基于液晶/聚合物光栅选频的高效率有机半导体激光器

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0.32μJ/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53.4nm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。

High efficiency organic semiconductor laser using a liquid crystal/polymer grating as an oscillation cavity

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.