Hsiao Vincent, Lu Changgui, He Guang, Pan Michael, Cartwright Alexander, Prasad Paras, Jakubiak Rachel, Vaia Richard, Bunning Timothy
Opt Express. 2005 May 16;13(10):3787-94. doi: 10.1364/opex.13.003787.
Electrically switched distributed-feedback (DFB) lasing action is presented in a Pyrromethene 580 lasing dye-doped holographic polymer dispersed liquid crystal (H-PDLC) transmission grating structure. This design, when compared with the previously utilized H-PDLC reflection grating structure, has the advantage of a greatly enlarged gain length (10 mm) and a low concentration of liquid crystal (20%) while maintaining sufficient refractive index modulation. The experimental results demonstrate that the emitted laser bandwidth (~5 nm) can be obtained with a pump energy threshold of ~0.3 mJ at three different wavelengths, 561 nm, 569 nm and 592 nm, corresponding to three different grating spacings. The near- and far-field measurements have shown a high directionality of the lasing output. The lasing can be electrically switched off by an applied field of 30V/mum. The temporal, spectral, and output/input properties of the laser output are also presented.
在一种掺杂了吡咯甲川580激光染料的全息聚合物分散液晶（H-PDLC）透射光栅结构中实现了电开关分布式反馈（DFB）激光作用。与先前使用的H-PDLC反射光栅结构相比，这种设计的优点是增益长度大大增加（10毫米）且液晶浓度较低（20%），同时保持足够的折射率调制。实验结果表明，在561纳米、569纳米和592纳米这三个不同波长下，对应于三种不同的光栅间距，泵浦能量阈值约为0.3毫焦时可获得发射激光带宽（约5纳米）。近场和远场测量表明激光输出具有高方向性。通过施加30V/μm的电场可将激光电关闭。还介绍了激光输出的时间、光谱和输出/输入特性。
