Abstract

Structural relaxation is a key factor to control structure and physical properties of silica glass. We investigated structural disorder during structural relaxation processes, and have found that the disorder reduces with decreasing the fictive temperature. Consequently, various optical properties, e.g., Rayleigh light scattering, Urbach edge, and formation of photo‐induced defects are straightforwardly correlated to the fictive temperature. The structural relaxation has been tentatively analyzed assuming two processes: main‐and sub‐relaxations. Both processes seem to be encouraged tremendously by the halogen doping, especially with fluorine and chlorine. Both main‐ and sub‐relaxations can be shortened by the order of 5–6 orders of magnitude by doping of several percents of F. The result implies that a great possibility of breakthrough that silica glass can be more transparent, as the density fluctuation in silica glass that is frozen at the fictive temperature can be reduced through the relaxations. This in turn means that the fiber drawing process under the best‐optimized temperature condition should yield much more lucent fibers. We have also found that UV absorption edge is very much affected by the structural relaxation. The absorption edge shifts to shorter wavelengths with decreasing the fictive temperature.

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