基于透射式液晶/聚合物光栅的分布反馈式激光器的研究

Distributed-feedback lasing from dye-doped holographic polymer dispersed liquid crystal transmission grating

本文研究了染料掺杂透射式液晶/聚合物光栅的制备以及基于透射式液晶/聚合物光栅的分布反馈式激光器的激光特性.实验选取DCM作为激光染料,制备了周期为586nm的掺杂DCM的透射式液晶/聚合物光栅;使用532nm输出的NdYAG倍频脉冲激光器作为抽运光源对染料掺杂液晶/聚合物光栅进行侧面抽运,得到了中心波长为603nm的窄线宽、低阈值激光输出.激光线宽为1.4nm、阈值能量约为17.3μJ,与之前国外的报道相比,阈值能量有了很大幅度的降低.

In this paper,we report the fabrication of dye-doped holographic polymer dispersed liquid crystal（HPDLC） transmission grating and the property of distributed-feedback lasing from dye-doped HPDLC transmission grating.Under the excitation of a frequency-doubled Ndyttrium-aluminum-garnet laser operating at a wavelength of 532 nm,optically pumped lasing with narrow linewidth and low threshold was observed from a DCM dye-doped HPDLC transmission grating with the grating period of 586 nm.The results showed that the emitted lasing peak centered at about 603 nm with a full width at half maximum（FWHM） of only 1.4 nm,and the threshold pumping intensity was about 17.3 μJ,which is evidently lower than the previously reported values.