Title
Generation and bleaching of intrinsic color centers in photo-thermo-refractive glass matrix
Abbreviated Journal Title
J. Non-Cryst. Solids
Keywords
Optical glass; Ionization; Color centers; Bleaching; NA2O-CAO-MGO-SIO2 GLASSES; ABSORPTION; SPECTRA; WATER; IRON; Materials Science, Ceramics; Materials Science, Multidisciplinary
Abstract
Photo-thermo-refractive (PTR) glass is a photosensitive multicomponent silicate glass that imparts refractive index change after exposure to ionizing radiation and thermal treatment. The origin of this photosensitivity is explained by thermal precipitation of sodium fluoride crystals controlled by atomic silver nucleation centers. These centers are produced by photo-reduction of silver ions resulted from photo-ionization (photo-oxidizing) of cerium ions. This feature of PTR glass is successfully used for high efficiency phase hologram recording. However, the mechanism of electric charge exchange (transfer) between these ions is not known and the role of intrinsic electron and hole centers was not studied. To elucidate this problem, pure PTR glass matrix with no dopants was prepared and the subsequent absorption spectra of color centers were studied after excitation of the intrinsic absorption edge of glass matrix. Color centers were bleached by thermal treatment and by optical excitation of induced absorption bands. The analysis of the structure of absorption spectra at different stages of coloration and bleaching led to the deconvolution of complex spectra to Gaussian components. Based on this analysis and comparison with simple silicate glasses, induced absorption bands were assigned to different intrinsic electron and hole centers. lnterconversion of different centers is also studied. (C) 2010 Elsevier B.V. All rights reserved.
Journal Title
Journal of Non-Crystalline Solids
Volume
356
Issue/Number
44-49
Publication Date
1-1-2010
Document Type
Article; Proceedings Paper
Language
English
First Page
2363
Last Page
2368
WOS Identifier
ISSN
0022-3093
Recommended Citation
"Generation and bleaching of intrinsic color centers in photo-thermo-refractive glass matrix" (2010). Faculty Bibliography 2010s. 7103.
https://stars.library.ucf.edu/facultybib2010/7103
Comments
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