Effect of liquid crystal concentration on the lasing properties of dye-doped holographic polymer-dispersed liquid crystal transmission gratings
Effect of liquid crystal concentration on the lasing properties of dye-doped holographic polymer-dispersed liquid crystal transmission gratings
复制标题
DOI：
10.1063/1.2426885
复制
发表时间：
2007-01
影响因子：
4
通讯作者：
Yanjun Liu;X. W. Sun;Hendry. I. Elim;W. Ji
中科院分区：
文献类型：
--
作者：
Yanjun Liu;X. W. Sun;Hendry. I. Elim;W. Ji
利用4-（二氰亚甲基）-2-甲基-6-（4-二甲氨基苯乙烯基）-4H-吡喃染料掺杂全息聚合物分散液晶透射光栅实现了不同液晶浓度的光泵浦单模激光输出，在激光产生和波长选择中发挥了重要作用。在532 nm倍频Nd：钇铝石榴石激光器的激发下，随着液晶浓度的降低，激光波长发生蓝移，激光峰值的半高宽变窄。当液晶浓度为19.7wt%时，最低阈值泵浦能量约为5μJ闪烁脉冲。由于折射率调制的变化，激光发射是热可切换的。
Optically pumped single-mode lasing was achieved from a 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran dye-doped holographic polymer-dispersed liquid crystal transmission grating with various liquid crystal concentrations, which played an important role in the lasing generation and wavelength selection. With the decrease of the liquid crystal concentration, under the excitation of a frequency-doubled Nd:yttrium aluminum garnet laser operating at 532nm, the lasing wavelength was blueshifted, and the full width at half maximum of the lasing peak became narrower. The lowest threshold pumping energy was found to be about 5μJ∕pulse at a liquid crystal concentration of 19.7wt%. The lasing emission was thermally switchable due to the change of the refractive index modulation.