Temperature distributions due to annular laser beam heating

    Authors

    D. Zeng; W. P. Latham;A. Kar

    Comments

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    Abbreviated Journal Title

    J. Laser Appl.

    Keywords

    laser drilling; optical trepanning; annular laser beam; temperature; distribution; 2-DIMENSIONAL MODEL; CO2-LASER BEAM; DAMAGE; VAPORIZATION; Materials Science, Multidisciplinary; Optics; Physics, Applied

    Abstract

    Optical trepanning is a new laser drilling method using an annular beam. Since laser heating of the substrate occurs first due to heat conduction, this article investigates the temperature distribution in the workpiece due to pulsed annular laser beams by solving an axisymmetric transient heat conduction equation. The annular beams allow numerous irradiance profiles to supply laser energy to the workpiece and thus provide more flexibility in affecting the hole quality than a traditional circular laser beam. Such profiles include half Gaussian with maximum intensities at the inner and outer radii of the annulus, respectively, and full Gaussian with maximum intensity within the annulus. In addition to this spatial beam shaping, the temporal profile of the laser pulse can be IN shaped to improve the hole quality. The Hankel and Laplace transforms have been used to obtain an analytic solution for the temperature distribution in a semi-infinite workpiece. The effects of the temperature distribution on laser drilling are analyzed to understand the influence of different laser parameters on the drilling process. (c) 2005 Laser Institute of America.

    Journal Title

    Journal of Laser Applications

    Volume

    17

    Issue/Number

    4

    Publication Date

    1-1-2005

    Document Type

    Article

    Language

    English

    First Page

    256

    Last Page

    262

    WOS Identifier

    WOS:000233760900009

    ISSN

    1042-346X

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