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利用低官能度的丙烯酸酯单体进行全息液晶/聚合物光栅的制备,获得了具有聚合物支撑形貌的光栅结构.由于这种光栅内部不存在液晶微滴,当作为分布反馈式激光器的谐振腔时,可以有效降低光栅内部的散射损失(<4%),降低激光腔损耗.此外,选用的高折射率单体提升了光栅的折射率调制量,增强了光栅的反馈增益.在以上两种因素的共同作用下,采用染料DCM为激光工作物质,以532nm的Nd:YAG脉冲激光器作为抽运光源,最终获得了中心波长为635nm,转化效率为1.2%的高性能激光,在以阈值能量0.8μJ/pulse抽运下获得激光线宽0.3nm,较之国内外同类激光器的报道,在阈值、线宽、转化效率三方面均有不同程度提升.
The preparation of holographic liquid crystal / polymer gratings with low functional acrylate monomer results in a grating structure with a polymer support topography.Because there is no droplet of liquid crystal inside the grating, as the resonance of distributed feedback laser The cavity can effectively reduce the scattering loss (<4%) inside the grating and reduce the laser cavity loss.In addition, the selected high refractive index monomer enhances the refractive index modulation of the grating and enhances the feedback gain of the grating In the above two Under the combined action of various kinds of factors, using dye DCM as a laser working substance, a 532 nm Nd: YAG pulsed laser was used as a pumping light source to finally obtain a high performance laser with a center wavelength of 635 nm and a conversion efficiency of 1.2% The laser linewidth of 0.3nm is obtained under the pumping of 0.8μJ / pulse. Compared with the reports of similar lasers at home and abroad, the threshold, linewidth and conversion efficiency are all improved to some extent.