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25 October 2000 UV photosensitivity in conventionally melted germano-silicate glasses
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The UV-photosensitivity effect in germania-doped optical waveguides has become an important area of research because of the ease and utility of making Bragg gratings. In this study we report on the finding of a large UV-induced refractive index change in a conventionally melted an alkali-alumino-boro-germano- silicate composition that has been loaded with molecular hydrogen. The exposure was done with either CW 244-nm light, or a pulsed KrF excimer laser at 248-nm. A modulated refractive index of the order of 2-3 X 10-4 has been measured.
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Nicholas F. Borrelli, Charlene M. Smith, and Venkata A. Bhagavatula "UV photosensitivity in conventionally melted germano-silicate glasses", Proc. SPIE 4102, Inorganic Optical Materials II, (25 October 2000);

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