Permanent gratings (refractive index modulation ~3 x 10^-4) were written in tin-doped silica optical fibres with low levels of SnO2 (~0.15 mol %). In Ge-doped silica, ~10 mol% GeO2 is required to produce comparable photorefractivity under similar conditions.
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机译：将永久性光栅（折射率调制〜3 x 10 ^ -4）写在锡含量低的SnO2（〜0.15 mol％）的掺锡石英光纤中。在掺锗的二氧化硅中，需要约10摩尔％的GeO2在相似条件下产生可比的光折射率。
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