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RESEARCH PAPERS

Theoretical and Experimental Investigation of Laser Drilling in a Partially Transparent Medium

[+] Author and Article Information
T. Nowak, R. J. Pryputniewicz

Center for Holographic Studies and Laser Technology, Department of Mechanical Engineering, Worcester Polytechnic Institute, Worcester, MA 01609

J. Electron. Packag 114(1), 71-80 (Mar 01, 1992) (10 pages) doi:10.1115/1.2905444 History: Received December 23, 1990; Revised December 18, 1991; Online April 28, 2008

Abstract

An investigation of pulsed, laser drilling in a partially transparent medium was conducted. The study included both theoretical and experimental analyses. The theoretical analysis included development of a computer simulation to model the laser drilling process—a three-dimensional finite difference solution with temperature-dependent thermal properties, finite sample geometry, and experimentally determined laser beam characteristics. Both qualitative and quantitative correlation of the theoretical and experimental results was good with successful prediction of hole shapes and minimum error in the theoretically predicted cross-sectional areas of the laser-drilled holes ranging approximately ± three percent over the range of energies per laser pulse considered in this study. Results of calculations and experiments demonstrated the importance of the shape and irradiance distribution of the incident laser beam on the quality of laser-drilled holes in Al2 O3 samples.

Copyright © 1992 by The American Society of Mechanical Engineers
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