【摘要】 实验发现 ,当波长为 6 32 .8nm的基模 (TEM0 0 )He -Ne激光入射到厚度为 5mm的包覆十二烷基苯磺酸钠(DBS)的Bi2 O3 样品上时 ,在观察屏上出现多重衍射环 ,这是空间自相位调制的结果 .同时 ,还发现样品具有自聚焦、自陷和自散焦现象 .实验结果表明包覆DBS的Bi2 O3 纳米微粒具有大的非线性系数 (n2 =3.0× 10 -5esu)更多还原

【Abstract】 The experiment indicates that multiple diffraction rings appear at the observation screen as a 632.8?nm He_Ne TEM 00 _Mode laser passes through a coated Bi 2O 3-DBS nanoparticles. The phenomenon is the result of spatial self_phase modulation. Meanwhile, self_focusing, self_trapping and self_defocusing in this material has also been observed. The study result indicates that the nonlinear coefficient is very large( n 2=3.0×10 -5 ?esu).更多还原