Abstract
In the present research, a new class of bromine-containing photo-thermo-refractive (PTR) glass in which the UV irradiation and subsequent heat treatment cause the precipitation of silver nanoparticles with a shell consisting of silver bromides is developed and studied. The growth of AgBr nanocrystals is shown to lead to a local positive refractive index change (refractive index of crystallized glassy area is higher than one of non-crystalline) in the UV-irradiated area against the unirradiated area up to 800 ppm. Based on this effect, samples of a volume Bragg grating and a waveguide structure have been recorded.
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