熔盐对Li^+/Na^+离子交换及折射率分布的影响  

Effects of Molten Salt Composition on Exchanging Na^+ for Li^+ and Refractive Index Profile

作　　者：王耀祥[1] 黄琨[1] 章兴龙[1] 马成义[1] 王佑权[1] 

机构地区：[1]中国科学院西安光学精密机械研究所,光纤与集成光学研究室西安710068

出　　处：《光子学报》2003年第9期1070-1073,共4页Acta Photonica Sinica

摘　　要：研究发现利用Li+ /Na+ 离子交换制取径向梯度折射率 (GRIN)棒透镜时 ,在NaNO3熔盐中 ,添加NaCl,会影响Li+ /Na+ 离子交换反应平衡 ,最终改变径向GRIN棒透镜的折射率分布、折射率差值及像差 并着重分析和讨论了在本实验中NaNO3+NaCl混合熔盐对径向GRIN棒透镜中折射率分布。Presently the most widely used technique for fabricating radial gradient index(GRIN) rod lens is ion exchange. The ability to control and alter the shape of the index profile is an important area of research for the fabrication of gradient index materials. It is observed that radial gradient index profile produced by exchanging Na + for Li + can been controlled and altered by introducing NaCl into NaNO 3 molten salt in this paper. Because of the higher polarizability of Cl - than that of NO - 2 ions in molten salt, hence the coulombic forces between Cl - and Li + ions are stronger than the forces between NO - 2 and Li + ions, which limit the activity of Li + at the interface between glass and molten salt. Furthermore the reaction balance of ion exchange between Na + and Li + shifts toward right, which could alter the constant of balance and improved ion exchange. So radial gradient index profile can been controlled and altered by introducing NaCl into NaNO 3 molten salt.

关 键 词：径向梯度折射率 离子交换 折射率分布 像差 熔盐 棒透镜 LI^+ NA^+ 锂离子 钠离子 

分 类 号：O435.1[机械工程—光学工程]