光波导结构对其极化电光效应的影响

Influence of waveguide structure on the electro-optic effect induced by poling

本文采用热极化技术在掺锗玻璃条形光波导中诱导出非线性光学效应,并通过变化光波导结构改变极化内电场的大小,研究热极化条件对诱导出的电光效应的影响。研究发现在最佳极化时间内,加入薄SiON层的光波导结构经极化后电光效应积累快,相同极化条件下诱导出的电光系数比原有的条形光波导增大约22%,同时极化光波导还存在一个较低的极化阈值电压。实验结果表明加入光波导结构中的薄SiON层可在一定程度上改变极化光波导内的电荷分布,实现强化其内部电场增大光波导内的非线性光学效应或电光效应的目的。

Nonlinear optical effect is induced by thermal poling in glass channel waveguides,and modifying waveguide structure leads to a change of the induced internal field,which poling conditions are optimized by systematical investigations in air environment.It is found,by adding a thin SiON layer in the waveguides,that electro-optic effect induced in the modified channel waveguides increases about 22% at the same conditions;electro-optic effect grows faster and electro-optic coefficient increases more rapidly within an optimal poling time,a lower threshold of poling voltage at the optimized poling condition is observed as well.The experimental results achieved suggest the added thin SiON layer can modify the charge distribution in the waveguides after polling,which can be used to increase nonlinear optical effect or electro-optic effect in waveguide polling.