摘要
用熔融-急冷法制备了Ge_(14)Ga_3S_(37)(CdS)_3硫系玻璃样品,使用Maker条纹法观察了电场-温度场极化样品中的二次谐波发生(SHG)现象,研究了极化条件对SHG强度的影响、该效应产生的机理以及SHG现象室温下的稳定性．结果表明,极化样品中存在明显的二次谐波发生现象,入射角在±(40～50)°左右时,SHG的相对强度出现最大值;SHG的强度随着极化电压的增大和极化时间的延长而逐渐增强并渐趋饱和;在5 kV、280℃、30分钟的极化条件下,极化样品的二阶非线性极化系数x^(2)达到最大值4．36 pm/V;根据偶极子取向模型阐释了SHG产生机理以及极化条件对样品二阶光学非线性系数大小的影响机制;发现玻璃的电致极化区域位于阳极表面以下十几微米的区域,SHG效应在室温下是稳定的．
The chalcogenide glass with the composition Ge14Ga3S37（CdS）3 was prepared by the melt-quenching method. A prominent second harmonic generation （SHG） was observed from the thermally poled sample utilizing the Maker-fringe technique and its mechanism was discussed in detail. （1） Maker- fringe with good symmetry was observed within the thermally poled samples, and the maximum of relative SHG intensities appeared at an incidence angle around ±（40-50）°. （2） The maximum of relative SHG intensities increases gradually with the enhanced temperature together with prolonged time and obtains its maximum lastly. （3） Under the poling condition of 5 kV, 280 T3 and 30 min, the second-order nonlinear susceptibility, Х^（2）, attains its maximum 4.36 pm/V. （4） Utilizing the model of dipoles, the mechanism of SHG and its dependence on poling voltage and time is elucidated. （5） It was found that the poling effective region is located at a region several microns under surface of anode and the SHG has the good room temperature stability.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2007年第3期305-310,共6页
Chinese Journal of Materials Research
基金
硅酸盐材料工程教育部重点实验室(武汉理工大学)开放基金SYSJJ2005-13资助项目.~~
