强冲击压缩下LiF,Al_2O_3和LiTaO_3单晶的透光性  

Optical transparency of z-cut LiF,Al_2O_3 and LiTaO_3 single crystals under strong shock compression

作　　者：周显明[1] 汪小松[1] 李赛男[1] 李俊[1] 李加波[1] 经福谦[1] 

机构地区：[1]中国工程物理研究院流体物理研究所,冲击波与爆轰物理重点实验室,绵阳621900

出　　处：《物理学报》2007年第8期4965-4970,共6页Acta Physica Sinica

基　　金：中国工程物理研究院科学技术基金(批准号:20050102)资助的课题.~~

摘　　要：在二级轻气炮上,用高速电子相机扫描照相技术和改进的Mallory实验装置,对z切LiF,Al2O3(蓝宝石)和LiTaO3单晶材料的冲击透光性进行了对比测量,并用黑密度计提取出动态图像定量化的光强对比度变化曲线.结果表明,LiF单晶在102GPa压强下能够保持长时间的初始透光性不变,与公认的LiF具有优良的高压下透明性的认识一致.LiTaO3单晶在实验压力(139GPa)下变成基本不透明.而Al2O3单晶在131GPa冲击压力下则表现为透明性逐渐下降直至完全不透明.In this paper, a comparative experimental study on optical transparency of z-cut LiF, sapphire and LiTaO3 under 10^11 Pa shock compression at our two-stage light-gas gun facility is presented. In our experiments, intensity contrast variation of light emitted from a modified experimental setup of Mallory-type was monitored by a high-speed electronic camera. The results demonstrated that the LiF under the shock pressure of 102 GPa retains its initial transparency in the whole observation time interval, which is in good agreement with the common view of good sustained transparency of LiF. The LiTaO3 became basically opaque at 139 GPa. Sapphire at 131 GPa shock pressure showed a continuous transparency degradation till became completely darkened when the shock wave was arriving at the free-surface.

关 键 词：A12O3 LIF LITAO3 光学透明性 

分 类 号：O734[理学—晶体学]