极化方式对硫系玻璃二次谐波的影响机理研究

The Mechanism of the Poling Methods on the Second Harmonic Generation of the Chalcogenide Glasses

为探索具有较大二阶非线性光学性能的玻璃材料，利用传统的熔融淬冷法，制备了0．8GeS2·0．1Ga2S3·0．1X2S3（X=P，As，Sb）三种硫系玻璃。通过Maker条纹法测试了玻璃样品在极化后的二次谐波特性，用热诱导退极化电流法研究了各体系玻璃分别在电场／温度场极化、电子束辐射极化后产生二阶非线性光学性能的机理，系统分析了玻璃组成结构、极化性能和二次谐波之间的关系。二次谐波测试表明：对于用电场温度场极化的样品，二次谐波稳定性较差，其中含磷的稳定性最好；相反，用电子束辐射极化的样品，整体稳定性要好，而含锑的玻璃的二阶非线性最强。热诱导退极化电流测试表明，在电场温度场极化玻璃后，由偶极子取向产生的二阶非线性光学性能的弛豫时间都很短；相反用电子束辐射极化玻璃后，硫系玻璃内部较多的结构缺陷可以有效形成吸收电子和二次电子，从而导致玻璃产生的二阶非线性光学性能相对来说比较稳定，具有较长的弛豫时间。

To find new excellent nonlinear optical glassy materials, 0.8GeS2·0.1Ga2S3·0.1X2S3（X = P, As, Sb） chalcogenide glasses were prepared by the conventional melt quenching method. After poling the glasses by the electric/temperaturefield （ETF） and electron-beam irradiation （EBI）, the second harmonic generations （SHG） of the glasses were characterized by the Maker Fringe. The relaxation time of the glasses was tested by the thermally stimulated depolarization current （TSDC） technique, Relationship between the structure and the SHG of glasses has been studied systemically, The SHG results of the glasses show that by the ETFP, the SHG stability of the glasses is not very good and the glass containing the phosphorus is the best while for the EBIP, it is relatively better and the glass containing the antimony show the best stability, The test of the show that the relaxation time by the dipole reorientation of the glasses by ETFP is very short; while by EBIP, many defects in the chalcogenide can absorb the electrons and lead to a stable SHG with relatively longer relaxation time.