“绿色”液体激光介质的非线性光学特性研究  

Nonlinear Optical Properties of the "Green" Liquid Laser Medium

作　　者：彭文炫[1] 冯国英[1] 张秋慧[1] 伍爱明[2] 柳岿[1] 李密[3] 宋影松[3] 

机构地区：[1]四川大学电子信息学院,成都610064 [2]四川大学化工学院,成都610064 [3]中国工程物理研究院应用电子学研究所,四川绵阳621900

出　　处：《光子学报》2011年第7期1122-1126,共5页Acta Photonica Sinica

基　　金：国家自然科学基金NSAF项目(No.10976017;No.60890200)资助

摘　　要：利用氧化钕和盐酸为原料制得Nd(phen)2Cl3(三氯二邻菲罗啉合钕),测得其光谱特性并以稀土氧化钕、苯甲酸和邻菲罗啉为原料制得绿色液体激光介质钕离子的配合物———NdB3phen(三苯甲酸—邻菲罗啉合钕).利用飞秒激光器,采用单光束Z-扫描法研究了NdB3phen的三阶非线性光学特性.结果表明:当入射飞秒激光脉冲波长为400 nm,峰值功率密度为2.94×1014W/m2,脉宽为117 fs时,测得样品NdB3phen的非线性折射率为-2.84×10-18cm2/W;NdB3phen在开孔条件下呈现反饱和吸收现象,测出双光子吸收系数的值为9.11×10-12m/W.实验结果表明,NdB3phen的双光子吸收系数和非线性折射率随着光强的增强而增大.Using Nd2O3 and HCl as raw materials,Nd（phen）2Cl3 was obtained and its spectral characteristics were measured.With Nd2O3,benzoic acid and o-phenanthroline as the raw material,green liquid laser medium Nd3＋ ions complexes—NdB3phen（tribenzoic acid-phenanthroline co-Nd） was prepared.The third-order non-linear optical properties of NdB3phen were studied using femtosecond laser and signal-beam Z-scan method.When the incident femtosecond laser pulse wavelength is 400 nm,the peak power density is 2.94×1014 W/m2,and pulse width is 117 fs,the measured nonlinear refractive-index coefficient of the sample is-2.84×10-15 cm2/W.Under the opening aperture configuration,NdB3phen presents phenomenon of the reverse saturated absorption,and the measured two-photon absorption coefficient is estimated to be 9.11×10-12 m/W.The experimental results show that two-photon absorption coefficient and nonlinear refractive-index coefficient of NdB3phen refractive index become more intense.

关 键 词：三苯甲酸—邻菲罗啉合钕 Z扫描 非线性折射 非线性吸收 液体激光器 

分 类 号：O552.421[理学—热学与物质分子运动论]