STP911

    Laser Damage Threshold Predictions Based on the Effects of Thermal and Optical Properties Employing a Spherical Impurity Model

    Published: Jan 1985


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    Abstract

    The influence of the thermal and optical properties of thin films on the damage threshold for pulsed laser induced damage is studied via the spherical impurity damage model. A previous study employing the geometric cross section of the impurity as the absorption cross section of the incident laser predicted several scaling laws. Those scaling laws gave the damage threshold as a function of the laser pulse parameters along with the thermal properties of the thin film and impurity. That model neglected the effect of the optical properties of the thin film and impurity and the wave nature of the incident laser. These are incorporated in the present study by utilization of Mie scattering theory resulting in somewhat modified scaling laws. The absorption cross section results from Mie theory are presented and discussed along with a comparison of the scaling laws with each other and with experimental data. No simple scaling laws for the optical properties are apparent and, as such, a numerical study of these are conducted and the trends suggested by the analysis are compared with experimental observation.

    Keywords:

    absorption cross section, laser induced damage, Mie theory, spherical inclusions, thermal properties


    Author Information:

    Lange, MR
    Institute for Modern Optics, University of New Mexico, Albuquerque,

    McIver, J
    Institute for Modern Optics, University of New Mexico, Albuquerque,

    Guenther, AH
    Institute for Modern Optics, University of New Mexico, Albuquerque,


    Paper ID: STP29001S

    Committee/Subcommittee: F01.11

    DOI: 10.1520/STP29001S


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