Gradient of refractive index (GRIN) effect in photo-thermo-refractive glass

    Authors

    J. Lumeau;L. B. Glebov

    Comments

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    Abbreviated Journal Title

    Appl. Optics

    Keywords

    KINETICS; Optics

    Abstract

    Photo-thermo-refractive (PTR) glass is a photosensitive multicomponent silicate glass containing photosensitive agents such as cerium and silver. Photoinduced crystalline phase precipitation results in refractive index variations in exposed areas of PTR glass, which has been successfully used for phase hologram recording. Photosensitivity being the result of the partial absorption of the exposing radiation by cerium ions, it results in a gradient of refractive index (GRIN) along the exposure beam propagation. This GRIN is a parasitic effect that deteriorates the parameters of some types of volume Bragg gratings because of the beam deflection they produce. In this paper, the evolution of GRIN is investigated as a function of the dosage of UV exposure and the thermal treatment duration. We show that GRIN is a deterministic process that can be easily modeled and predicted using basic optics and glass science equations. (C) 2015 Optical Society of America

    Journal Title

    Applied Optics

    Volume

    54

    Issue/Number

    7

    Publication Date

    1-1-2015

    Document Type

    Article

    Language

    English

    First Page

    1587

    Last Page

    1593

    WOS Identifier

    WOS:000350263000004

    ISSN

    1559-128X

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