The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 12, 2002
Filed:
Mar. 31, 1999
Applicant:
Inventors:
Abdelkrim Tatah, Arlington, MA (US);
Xinbing Liu, Acton, MA (US);
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23K 2/600 ;
U.S. Cl.
CPC ...
B23K 2/600 ;
Abstract
A method for focusing an ultrashort pulse laser relative to a workpiece using the position of a plasma formed by a laser. A laser beam is focused to a focal point. The high peak intensity of the ultrashort pulse laser ionizes air at the focal region to form a plasma. The intensity of the plasma varies as its position relative to the workpiece varies. The intensity of the plasma formed by the focused laser beam is detected. The position of the focal point relative to the workpiece is adjusted responsive to the detected intensity of the plasma.