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1. (WO1989011948) METHOD AND APPARATUS FOR OPTIMIZING THE EFFICIENCY AND QUALITY OF LASER MATERIAL PROCESSING

Pub. No.:    WO/1989/011948    International Application No.:    PCT/US1989/002161
Publication Date: Dec 14, 1989 International Filing Date: May 18, 1989
IPC: B23K 26/06
B23K 26/08
Applicants: MIDWEST RESEARCH INSTITUTE
SUSEMIHL, Ingo
Inventors: SUSEMIHL, Ingo
Title: METHOD AND APPARATUS FOR OPTIMIZING THE EFFICIENCY AND QUALITY OF LASER MATERIAL PROCESSING
Abstract:
The efficiency of laser welding and other laser material processing is optimized according to this invention by rotating the plane of polarization of a linearly polarized laser beam in relation to work piece (12) of the material being processed simultaneously and in synchronization with steering the laser beam over work piece (12) so as to keep the plane of polarization (84) parallel to either the plane of incidence (A-A) or the direction of travel of the beam in relation to work piece (12). Also, depending to some extent on the particular processing being accomplished, such as welding or fusing, the angle of incidence of laser beam (22) on work piece (12) is kept at or near the polarizing or Brewster's angle. The combination of maintaining the plane of polarization (84) parallel to plane of incidence (A-A) while also maintaining the angle of incidence at the polarizing or Brewster's angle results in minimal, if any, reflection losses during laser welding.