“绿色”液体激光介质的非线性光学特性研究

 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.

Nonlinear Optical Properties of the “Green&rdquo|Liquid Laser Medium

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.