Direct femtosecond laser writing of waveguides in As2S3 thin films

    Authors

    A. Zoubir; M. Richardson; C. Rivero; A. Schulte; C. Lopez; K. Richardson; N. Ho;R. Vallee

    Comments

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    Abbreviated Journal Title

    Opt. Lett.

    Keywords

    CHALCOGENIDE GLASSES; 2-PHOTON ABSORPTION; STRUCTURAL-CHANGES; PULSES; FABRICATION; GRATINGS; SILICA; Optics

    Abstract

    Single-channel waveguides and Y couplers were fabricated in chatcogenide thin films by use of femtosecond laser pulses from a 25-MHz repetition rate Ti:sapphire laser. Refractive-index differentials (Deltan > 10(-2)) were measured through interferometrie microscopy and are higher than the typical values reported for oxide glasses. The dependence of the index differential on the peak intensity reveals the nonlinear nature of the photosensitivity in arsenic trisulfide below its bandgap energy, and the refractive-index change is correlated to the photoinduced structural changes inferred by Raman spectroscopy data. A free-electron model to predict the parametric dependence of An is proposed. (C) 2004 Optical Society of America.

    Journal Title

    Optics Letters

    Volume

    29

    Issue/Number

    7

    Publication Date

    1-1-2004

    Document Type

    Article

    Language

    English

    First Page

    748

    Last Page

    750

    WOS Identifier

    WOS:000220362700030

    ISSN

    0146-9592

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