制作球对称梯度折射率微球透镜精确控制折射率剖面形成的方法

THE METHOD FOR MAKING SPHERICAL SYMMETRIC GRIN SPHERE MICRO-LENS TO CONTROL FORMATION OF GRADIENT INDEX PROFILE ACCURATELY

分析了球对称梯度折射率（ＧＲＩＮ）球形光学器件的优越性，指出了该类透镜要求经制作所形成的折射率分布更严格地符合理论分布，传统的离子交换技术已不能满足这种技术要求。建议将“使用不同浓度混合熔盐进行多阶段离子交换”的方法应用于制备这类徽球透镜，并在球坐标下导出了ＧＲＩＮ分布的级数解。以Ｍａｘｗｅｌｌ鱼眼微球透镜为例进行的数值计算，获得了最佳工艺条件和相应的ＧＲＩＮ分布。结果表明，应用这种离子交换新技术可以精确实现所需的ＧＲＩＮ剖面分布。最后提出新折合时间的概念和用微机自动控制的设想，以确保批量加工时最佳工艺条件的精确实现。

Advantages of spherical symmetric GRIN sphere micro-lens are analysed,but these lens requiredthat their refractivity distribution agrees with the theoretical one more rigorously , so the traditional ion-ex-change methed can't satisfy this requirement. In this paper the method by using mixed molten salts through muLti-step ion-exchanges is suggested for making the sort of lens,and the series solution of the GRIN distributionin spherical polar ccordinates is derived.As an example,numerical calculation for Maxwell's fisheye sphere lensgives the optimal technical conditions and corresponding GRIN distribution. The result shows that,with this newmethod, the theoretical spherical index distribution required can be obtained accurately.Finally, in order to realizethe best technical conditions in batch preduction,the concept of new generalized time and idea of automatic con-trol by use of microcomputer are proposed.