Nonlinear optical beam propagation for optical limiting

    Authors

    D. I. Kovsh; S. Yang; D. J. Hagan;E. W. Van Stryland

    Comments

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    Abbreviated Journal Title

    Appl. Optics

    Keywords

    EXCITED-STATE ABSORPTION; INDUCED THERMAL LENS; Z-SCAN; CONDENSED; MATTER; SINGLE-BEAM; LIQUID; REFRACTION; Optics

    Abstract

    We implement numerical modeling of high-energy laser-pulse propagation through bulk nonlinear optical materials using focused beams. An executable program with a graphical user interface is made available to researchers for modeling the propagation of beams through materials much thicker than the diffraction length (up to 10(8) times longer). Ultrafast nonlinearities of the bound-electronic Kerr effect and two-photon absorption as well as time-dependent excited-state and thermal nonlinearities are taken into account. The hydrodynamic equations describing the rarefaction of the medium that is due to heating are solved to determine thermal index changes for nanosecond laser pulses. We also show how this effect can be simplified in some cases by an approximation that assumes instantaneous expansion (so-called thermal lensing approximation). Comparisons of numerical results with several Z-scan, optical limiting and beam distortion experiments are presented. Possible application to optimization of a passive optical limiter design is discussed. (C) 1999 Optical Society of America. OCIS codes: 190.5530, 190.5940, 190.4870, 190.3270, 190.4180.

    Journal Title

    Applied Optics

    Volume

    38

    Issue/Number

    24

    Publication Date

    1-1-1999

    Document Type

    Article

    Language

    English

    First Page

    5168

    Last Page

    5180

    WOS Identifier

    WOS:000082100600014

    ISSN

    1559-128X

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