High-efficiency Bragg gratings in photothermorefractive glass

    Authors

    O. M. Efimov; L. B. Glebov; L. N. Glebova; K. C. Richardson;V. I. Smirnov

    Comments

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    Abbreviated Journal Title

    Appl. Optics

    Keywords

    Optics

    Abstract

    Photosensitive silicate glasses doped with silver, cerium, fluorine, and bromine were fabricated at the Center for Research and Education in Optics and Lasers. Bragg diffractive gratings were recorded in the volume of these glasses with a photothermorefractive process (exposure to UV radiation of a He-Cd laser at 325 nm is followed by thermal development at 520 degrees C). Absolute diffraction efficiency of as much as 93% was observed for l-mm-thick gratings with spatial frequencies up to 2500 mm(-1). No decreasing of diffraction efficiency was detected at low spatial frequencies. Original glasses were transparent (absorption coefficient less than I cm(-1)) from 350 to 4100 nm. Induced losses in exposed and developed glass decreased from 0.3 to 0.03 cm(-1) between 400 and 700 nm, respectively, and did not exceed 0.01-0.02 cm(-1) in the IR region from 700 to 2500 nm. Additional losses caused by parasitic structures recorded in the photosensitive medium were studied. (C) 1999 Optical Society of America OCIS codes: 050.7330, 090.2900, 160.2750.

    Journal Title

    Applied Optics

    Volume

    38

    Issue/Number

    4

    Publication Date

    1-1-1999

    Document Type

    Article

    Language

    English

    First Page

    619

    Last Page

    627

    WOS Identifier

    WOS:000078473400001

    ISSN

    1559-128X

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