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Scanning Laser Beam Algorithms for Preferred Shaping and Micromachining At Normal Incidence

IP.com Disclosure Number: IPCOM000014186D
Original Publication Date: 2000-Aug-01
Included in the Prior Art Database: 2003-Jun-19
Document File: 1 page(s) / 28K

Publishing Venue

IBM

Abstract

A process is disclosed that permits clean 3-dimensional (3D) micromachining of a surface by scanning a pulsed laser spot at normal incidence to the surface.

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  Scanning Laser Beam Algorithms for Preferred Shaping and Micromachining At Normal Incidence

   A process is disclosed that permits clean 3-dimensional (3D) micromachining of
a surface by scanning a pulsed laser spot at normal incidence to the surface.

         In prior laser micromachining processes, a focused laser spot at normal
incidence is moved around the surface to produce material-removal at desired
locations. However, material-removal is frequently accompanied by debris
deposition. Furthermore, the prior laser micromachining processes provide only
2-D features, but not 3-D features like a sloping surface.

         This laser scanning process utilizes an algorithm or control program
that controls the laser spot diameter s, the scan velocity v, the pulse
repetition rate r, and the pulse laser energy E. By controlling these parameters
when scanning the pulsed laser spot at normal incidence on the surface, one can
produce 3-D features with reduced debris deposited on the surface. For example,
to produce a sloping surface, a line L1 is first scanned on the surface at the
deepest location of the sloping surface to be produced. L1 is composed of
overlapping laser spots, and the depth at L1 is controlled by proper setting of
s, v, r, and E. Next, an overlapping scan line L2 is scanned next to L1,
typically with some overlap (i.e., the spacing between L1 and L2 is less than the
spot diameter s), and the energy E used in L2 is reduced in order to make
shallower cuts. By utilizing more overlapping line...