An inconvenience of prism couplers is that the prism material must have a high refractive index.
棱镜耦合器的一个不方便的地方是棱镜材料必须有较高的折射率。
This is a kind of gem material with high refractive index.
这是一种具有高折射率的宝石材料。
High energy heavy ions generate potential tracks on the face of insulated material, and a porous surface with gradient refractive index can be formed by etching the ion tracks.
高能重离子在绝缘材料表面产生的潜径迹经过蚀刻后形成一定形貌的核径迹孔，而密集的径迹孔表面相当于渐变折射率层。
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