Generation and bleaching of intrinsic color centers in photo-thermo-refractive glass matrix

    Authors

    K. Chamma; J. Lumeau; L. Glebova;L. B. Glebov

    Comments

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    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

    WOS:000285282100016

    ISSN

    0022-3093

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