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
作者单位
1 四川大学 a.电子信息学院
2 四川大学 b.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
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 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.

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 Wenxuan, FENG Guoying, ZHANG Qiuhui, WU Aiming, LIU Kui, LI Mi, SONG Yingsong. Nonlinear Optical Properties of the “Green” Liquid Laser Medium[J]. ACTA PHOTONICA SINICA, 2011, 40(7): 1122.

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