New Gradient Index Optical Glasses for Optoelectronic Systems

径向梯度折射率(GRIN)透镜具有从光轴向外径向变化的折射率分布。大数值孔径GRIN镜片使用的是含有氧化铊的玻璃。折射率梯度是由熔融盐浴中的钾、K+与玻璃中的铊、Tl+的离子交换产生的。铊具有剧毒，因此在美国的制造环境中被禁止使用。在单价离子中，只有银和铊提供了足够大的折射率变化，当与碱性离子交换时，可以产生高数值孔径的GRIN透镜。我们建议使用含银玻璃和钠交换银来生产梯度。他的工作将解决优化含银玻璃离子交换剂的组成的问题。玻璃必须具有相对较高的离子迁移率，耐盐浴，并产生良好的折射率分布，以提供高质量的成像。一系列含银玻璃将被熔化，并测量其导电性和耐化学性。将对成功的候选玻璃进行离子交换实验，并测量和分析折射率分布。

Radial gradient index (GRIN) lenses have a refractive index profile which varies radially outward from the optical axis. High numerical aperture GRIN Lenses use glasses containing thallium oxide. The refractive index gradient is produced by ion exchange of potassium, K+, from a molten salt bath, for thallium, Tl+ in the glass. Thallium is highly toxic making its use prohibitive in a manufacturing environment in the United States. Of the single valent ions only silver and thallium provide a large enough index change to produce high numerical aperture GRIN lenses when exchanged with alkali ions. We propose to use a silver containing glass and exchange of sodium for silver to produce the gradient.l. His work will address the problem of optimizing the composition of a silver containing glass ion exchange. The glass must have relatively high ionic mobility, be chemically resistant to the salt bath, and produce a good refractive index profile to provide high quality imaging. A series of silver containing glasses will be melted and their conductivity and chemical resistance measured. Ion exchange experiments will be performed in the successful candidate glasses and the refractive index profile will be measured and analyzed.