A high-order external distributed feedback polymer laser with low working threshold
A high-order external distributed feedback polymer laser with low working threshold
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一种低工作阈值的高阶外分布反馈聚合物激光器
DOI：
10.1088/0022-3727/49/17/175106
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发表时间：
2016-05-05
影响因子：
3.4
通讯作者：
Chen, Linsen
中科院分区：
文献类型：
--
作者：
Huang, Wenbin;Pu, Donglin;Chen, Linsen
报道了一种低阈值的高阶分布反馈聚合物激光器。使用高阶光栅增加了光刻公差，提供了更适合于大规模制造技术（诸如激光直写光刻和卷对卷处理）的相干光源。为了实现高阶DFB激光，设计了一种非常规的工作配置，其中光栅位于均匀的共轭聚合物膜的顶部。此外，一种新的福斯特能量转移共混物的两个共轭聚合物被用作增益介质。在泵浦时，该器件发射约603.6 nm的激光，带宽为0.5 nm。阈值约为20.5 μJ cm−2（~2.56 kW cm−2），即将进入廉价LED泵浦的范围。泵浦能量的进一步增加导致第29和第30布拉格阶的同时振荡。研究了高阶DFB聚合物激光器的工作原理，包括光谱特性和阈值与泵浦长度的关系。这种方法代表了向低成本，甚至是“一次性”聚合物激光器迈出的一步。
In this paper, we report a high-order distributed feedback (DFB) polymer laser with low working threshold. Using the high-order grating increases the lithographic tolerances, providing coherent light sources that are more amenable to mass-manufacturing techniques, such as laser direct writing lithography and roll-to-roll processing. To enable high-order DFB lasing, an unconventional working configuration is designed in which the grating is situated on top of the uniform conjugated polymer film. In addition, a novel Forster energy transfer blend of two conjugated polymers is used as the gain medium. Upon pumping, the device emits lasing around 603.6 nm with a bandwidth of 0.5 nm. The threshold is around 20.5 μJ cm−2 (~2.56 kW cm−2), about to enter the regime of inexpensive LED pumping. A further increase in pump energy results in simultaneous oscillations at the 29th and 30th Bragg orders. Operating principles of the high-order DFB polymer laser, including spectral performance and threshold dependence on pump length, are investigated. This approach represents a step towards low-cost, even ‘disposable’ polymer lasers.