GeS2-Ga2S3-CdS透明表面微晶玻璃的二阶非线性光学效应

采用热诱导法制备了GeS2-Ga2S3-CdS硫系微晶玻璃,X射线衍射(XRD)、透射光谱、扫描电子显微镜(SEM)测试结果表明,获得了含CdGa2S4微晶的透明表面微晶玻璃。采用Maker条纹法研究了微晶玻璃的二次谐波(SHG)效应,结果表明玻璃中的CdGa2S4微晶诱导了二次谐波效应的产生。CdGa2S4微晶在玻璃表面择优生长时,破坏玻璃的各向同性,可获得两个包络的Maker条纹,且入射角在±(35°~50°)左右时,二次谐波的相对强度出现最大值,二阶非线性强度最大可为α-石英单晶的8倍;CdGa2S4微晶在玻璃表面无择优生长时,由于玻璃表面较大的CdGa2S4晶粒的散射作用,只能获得一个包络的Maker条纹,即入射角为0°时,二次谐波的相对强度出现最大值。

Second Harmonic Generation of GeS2-Ga2S3-CdS Chalcogenide Transparent Surface Crystallized Glasses

Chalcogenide glass of GeS2-Ga2S3-CdS system was prepared by heat inducting. The results of X-ray diffraction (XRD), transmission spectrum and scanning electron microscope (SEM) showed that transparent surface microcrystal glass containing CdGa2S4 has been gained. The second harmonic generation (SHG) effect of the microcrystal glass was studied by Maker-fringe technique, and the result indicated that CdGa2S4 in the glass induced the occurrence of SHG effect. The isotropy of the glass was broken when CdGa2S4 was growing preferentially on the surface of the microcrystal glass, and two enveloping Maker-fringes were obtained. And the maximum of relative second harmonic (SH) intensities appeared at incidence angle around ±(35°～50°) which was 8 times as that of α-quartz single crystal. When CdGa2S4 was growing non-preferentially on the surface of the microcrystal glass, only one enveloping Maker-fringe was obtained because of the strong scattering from CdGa2S4 grains. That is the maximum relative SHG intensities which appeared at incidence angle of 0.