光子学报, 2011, 40 (7): 1122, 网络出版: 2011-08-10
“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
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 Tribenzoic acidphenanthroline coNd Zscan Nonlinear refraction Nonlinear absorption Liquid laser
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2.94×1014 W/m2,脉宽为117 fs时,测得样品NdB3phen的非线性折射率为-2.84×10-18 cm2/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9.11×10-12 m/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.
Abstract
Using Nd2O3 and HCl as raw materials, Nd (phen)2Cl3 was obtained and its spectral characteristics were measured. With Nd2O3, benzoic acid and ophenanthroline as the raw material, green liquid laser medium Nd3+ ions complexes—NdB3phen (tribenzoic acidphenanthroline coNd) was prepared. The thirdorder nonlinear optical properties of NdB3phen were studied using femtosecond laser and signalbeam Zscan 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 refractiveindex 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 twophoton absorption coefficient is estimated to be 9.11×10-12 m/W. The experimental results show that twophoton absorption coefficient and nonlinear refractiveindex coefficient of NdB3phen refractive index become more intense.
彭文炫, 冯国英, 张秋慧, 伍爱明, 柳岿, 李密, 宋影松. “绿色”液体激光介质的非线性光学特性研究[J]. 光子学报, 2011, 40(7): 1122. PENG Wenxuan, FENG Guoying, ZHANG Qiuhui, WU Aiming, LIU Kui, LI Mi, SONG Yingsong. Nonlinear Optical Properties of the “Green” Liquid Laser Medium[J]. ACTA PHOTONICA SINICA, 2011, 40(7): 1122.