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:
Jan. 04, 2011
Filed:
Mar. 18, 2009
Ryusuke Kawakami, Kanagawa, JP;
Norihito Kawaguchi, Tokyo, JP;
Ryusuke Kawakami, Kanagawa, JP;
Norihito Kawaguchi, Tokyo, JP;
Abstract
A laser irradiation apparatus is provided in which the occurrence of adverse effects on an object to be irradiated with a laser beam due to the difference in the polarization state between pulsed laser beams can be prevented or significantly reduced when the pulsed laser beams emitted from two laser light sources are guided to pass through the same optical path for irradiation of an object to be irradiated with the pulsed laser beams. The laser irradiation apparatus is provided with a first laser light source, a second laser light source, an optical path combining optical memberwhich guides the pulsed laser beams emitted from the first laser light sourceand the second laser light sourceto pass through the same optical path, and a polarization control memberwhich controls polarization state of the pulsed laser beam from the optical path combining optical member. The polarization control memberincludes a first polarization control portionand a second polarization control portionthrough which beam components of the pulsed laser beam pass. The polarization states of the beam components that have passed through the first polarization control portionand the beam components that have passed through the second polarization control portionbecome different from each other. The beam components in different polarization states are superimposed on each other on a surface to be irradiated with the laser beam of the object to be irradiated with the laser beam.