Measurement of the induced refractive index in a photothermorefractive glass by a liquid-cell shearing interferometer

    Authors

    O. M. Efimov; L. B. Glebov;H. P. Andre

    Abbreviated Journal Title

    Appl. Optics

    Keywords

    BRAGG GRATINGS; RADIATION; Optics

    Abstract

    A liquid-cell shearing interferometer was developed to measure refractive-index variations (Deltan) in transparent materials. The cell was filled with a liquid having a matched refractive index. The achieved resolution was better than 1/1000 of a fringe shift and resulted in a Deltan measurement sensitivity down to 10(-7) for 1-mm-thick samples. A refractive-index increment in photothermorefractive glass of up to 5 x 10(-6) was observed after UV exposure at 325 nm. A refractive-index decrement of up to 1 x 10(-3) was observed after thermal development of the exposed sample. It was proved that photothermorefractive glass obeys the reciprocity law; i.e., Deltan depends on the UV dosage but does not depend on the irradiance. (C) 2002 Optical Society of America.

    Journal Title

    Applied Optics

    Volume

    41

    Issue/Number

    10

    Publication Date

    1-1-2002

    Document Type

    Article

    Language

    English

    First Page

    1864

    Last Page

    1871

    WOS Identifier

    WOS:000174812200006

    ISSN

    1559-128X

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