Spontaneous and photo-induced crystallisation of photo-thermo-refractive glass
Abbreviated Journal Title
Phys. Chem. Glasses-Eur. J. Glass Sci. Technol. Part B
Chemistry, Physical; Materials Science, Ceramics
Photo-thermo-refractive (PTR) glass is suitable for phase hologram recording resulting from photo-thermo-induced precipitation of a sodium fluoride crystalline phase. A detailed knowledge of its properties is necessary for the successful development of optical components. In this paper we present a systematic DSC and spectroscopy study of several (nominally identical) PTR glass melts. These studies revealed that when these glasses are nucleated at temperatures higher than 480 degrees C, the crystallisation peak shifts down to 650 degrees C. For the samples previously ultraviolet exposed and nucleated in the same conditions the crystallisation peak shifts down to 600 degrees C and in both samples another peak appears at 625 degrees C. Thus photo-exposure clearly catalyses crystallisation. It was also found that absorption band of the ultraviolet exposed samples moves from 410 to 485 nm. This shift is tentatively associated with the creation of silver bromide nuclei. Experiments with a ultraviolet exposed bromine-free glass did not show any crystallisation peak up to 720 degrees C, and no absorption peak shift occurred in case of irradiated samples.
Physics and Chemistry of Glasses-European Journal of Glass Science and Technology Part B
Article; Proceedings Paper
"Spontaneous and photo-induced crystallisation of photo-thermo-refractive glass" (2007). Faculty Bibliography 2000s. 7384.