Document Type dissertation Author Name Nowakowski, Krzysztof A. URN etd-121205-135626 Title Laser beam interaction with materials for microscale applications Degree PhD Department Mechanical Engineering Advisors prof R. J. Pryputniewicz, Advisor prof Cosme Furlong, Committee Member dr. Thomas F. Marinis, Committee Member prof. Richard D. Sisson, Jr., Committee Member prof. John M. Sullivan, Jr., Graduate Committee Rep Keywords laser beam characteristics heat transfer hole profile MEMS hole formation laser micromachining laser microdrilling plasma effects numerical calculations analytical solutions silicon 304 stainless steel Fourier theory lattice-phonon vibration Date of Presentation/Defense 2005-12-12 Availability unrestricted
Laser micromachining is essential in today’s advanced manufacturing, of e.g., printed circuit boards and electronic components, especially laser microdrilling. Continued demands for miniaturization, in particular of high-performance MEMS components, have generated a need for smaller holes and microvias as well as smaller and more controllable spot-welds than ever before. All these neeeds require smaller taper of the microholes and more stable and controlled laser micromachining process than currently available. Therefore considerable attention must be focused on the laser process parameters that control critical specifications such as accuracy of the hole size as well as its shape and taper angle, all of which highly influence quality of the laser micromachining processes. Determination of process parameters in laser micromachining, however, is expensive because it is done mostly by trial and error. This Dissertation attempts to reduce the experimental time and cost associated with establishing the process parameters in laser micromachining by employing analytical, computational, and experimental solutions (ACES) methodology.
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