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

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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.