【摘要】 利用不同偏振态入射光在银和铝表面上产生的光学二次谐波.本实验对这些金属的表面非线性极化源进行了研究.实验结果表明,Rudnick和Stern引入的、描述垂直于金属表面的面谐波电流的唯象参数“α”,应在-2和-7之间(倍频光波长为0.532μm).这与过去理论计算及实验测量值都有较大的不同;实验结果还表明,参数α值随入射角略有变化.本实验还首次验证了,衡量平行于金属表面的面谐波电流的唯象参数b≈-1的理论计算值.更多还原

【Abstract】 By detecting the Second Harmonic Generation (SHG) from the metal surfaces of Ag and Al via changing the polarization of incident light, we studied the surface nonlinear polarized source of these metals. It is found the phonomenological parameter "a", that Eudnick and Stern introduced in, to decribed the contribution of the second order surface current perpendicular to the metal surface, should lie between - 2 and - 7 (SH wave length: 0.532 μm). The value is of fairly different from the previous calculated or experimentally measured ones. Our results also demonstrate that the value of "a" changes with the incident angle, and the value of parameter "b", describing the contribution of the parallel surface second order current of the metal, is experimentally proved, for the first time, to be - 1 thatt theoretical calculation tells us.更多还原