Method of removing material from a workpiece
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United States of America Patent
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-
Sep 2, 1980
Issued Date -
N/A
app pub date -
Oct 6, 1977
filing date -
Oct 7, 1976
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pulsed infrared laser has an optical system for focusing the laser beam impulse, positioning a metallic workpiece to be drilled at the waist of the beam or at a spacing in the propagation direction in front of the waist of the laser beam, surrounding the portion of the workpiece from which metal is being removed with an atmosphere containing helium and/or hydrogen during the removal process, forming an expanding plasma in front of the portion of the workpiece to be drilled which absorbs the laser radiation at the start of the laser beam impulse by focusing the laser beam impulse at a large aperture angle and dimensioning the timewise intensity course of the laser beam impulse, and maintaining the expanding plasma only during a fraction of the laser beam impulse to remove material from the workpiece.
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