Effect of Replacement of As by Ge and Sb on the Photo-Response under Near Infrared Femtosecond Laser Irradiation in As-based Sulfide Glasses

    Authors

    J. D. Musgraves; N. Carlie; L. Petit; K. Richardson; G. Boudebs; J. Choi;M. Richardson

    Comments

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    Abbreviated Journal Title

    Int. J. Appl. Glass Sci.

    Keywords

    CHALCOGENIDE GLASSES; WAVE-GUIDES; PHYSICAL-PROPERTIES; STRUCTURAL-CHANGES; OPTICAL-PROPERTIES; REFRACTIVE-INDEX; AS2S3 GLASS; THIN-FILMS; RAMAN; SPECTROSCOPY; Materials Science, Ceramics

    Abstract

    Bulk glasses having the compositions As42S58, As36Sb6S58, and As36Ge6S58 have been irradiated at 800 nm using a femtosecond-pulsed laser to determine the relationship between composition and photo-response. Localized variation in the glass volume (photo-expansion) has been determined through interferometric measurements of surface exposures, whereas induced refractive index change (photo-darkening) was determined from the diffraction efficiency of subsurface direct-written phase gratings. To understand the compositional dependence of the photo-response, the linear and nonlinear optical properties and structure of the unexposed glasses have been compared. The ablation threshold is shown to be controlled by variation of the nonlinear absorption, related to shifts of the absorption band gap with exchange of As by Ge or Sb. Changes in the unexposed network structure show that partial replacement of As by Ge or Sb induces an increased number of As-As bonding defects in the glass, particularly in the form of As4S4 molecular units which become polymerized into the network, impacting the photo-modification process. The Ge was found to induce an increase in the ablation threshold, and enhance both photo-darkening and photo-expansion effects, whereas Sb was shown to decrease ablation threshold and inhibit photo-darkening while enhancing photo-expansion.

    Journal Title

    International Journal of Applied Glass Science

    Volume

    2

    Issue/Number

    4

    Publication Date

    1-1-2011

    Document Type

    Article

    Language

    English

    First Page

    308

    Last Page

    320

    WOS Identifier

    WOS:000310848500007

    ISSN

    2041-1286

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