UV–vis spectroscopic studies of CaF2 photo-thermo-refractive glass
Source abstract
Abstract
Abstract A photo-thermo-refractive glass based on the system Na 2 O/K 2 O/CaO/CaF 2 /Al 2 O 3 /ZnO/SiO 2 doped with Ag 2 O, CeO 2 , SnO 2 , Sb 2 O 3 and KBr was investigated. This glass undergoes a permanent refractive index change after UV irradiation and subsequent two step heat treatment at temperatures above Tg. This is due to the formation of Ag metal clusters which act as nucleation centers for CaF 2 crystallization. Oxidation of Ce 3+ by UV light is the initial reaction and acts as photosensitizer in the glass. The UV–vis absorption spectra during this photo-induced crystallization process were measured. The spectral components that form the absorption spectra of cerium were studied in detail by a band separation with Gaussian functions. Deconvolution of the cerium absorption bands shows an envelope of five spectral components for the trivalent cerium due to the 4f-5d transitions and two spectral components for the tetravalent cerium caused by charge transfer transitions. The effect of different dopants and melting conditions on the photo-thermal process were studied to investigate the influence of glass technology on the photoprocess.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Glass properties and applications · Surface Roughness and Optical Measurements · Solid State Laser Technologies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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