Development of ultra-low optical loss functional glass elements using corona charging treatment

研究了电晕充电对玻璃折射率的调制作用。本研究的目的是实现抑制光损耗的功能玻璃元件。折射率的调制取决于玻璃中碱金属离子的含量。研究发现，电晕充电处理会降低薄膜的折射率。利用该技术成功地抑制了光损耗。在进一步提高效率的实验中，我们发现了一种奇怪的现象，即可以在表面上形成与电晕充电处理的微观图案相对应的浮雕结构。

We studied a refractive index modulation in glass using corona charging. Aim of this study is realization of the functional glass elements that inhibit the optical loss. Modulation of the refractive index depends on the contained amount of alkali metal ion in the glass. It was found that refractive index was degraded by corona charging treatment. The Optical loss was successfully inhibited using this technique. In the experiment to further improve efficiency, we have discovered the curious phenomenon that can form a relief structure on the surface corresponding to the micro pattern of corona charging treatment.