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:
Dec. 29, 1992
Filed:
Dec. 04, 1991
Udo Freyaldenhoven, Heistern, DE;
Uranit GmbH, Julich, DE;
Abstract
In a pulsed gas laser apparatus for operation at ambient pressure comprising a laser module having a tubular window open at its distal end for the coupling or uncoupling of a laser beam, the tubular window has a volume which is at least equal to, or a multiple of, the volume change of the laser gas in the module during pulsed laser operation and extends essentially vertically from the laser module. The window includes a mixing zone in which during pulsed laser operation both laser gas and ambient gas are present, the window extending downwardly if the laser gas is lighter than the ambient gas and upwardly if the laser gas is heavier than the ambient gas thereby to counteract infiltration of ambient gas into the window. Also, means are provided for controlling the laser gas volume supplied to the module such that the concentration of the ambient gas in the mixing zone in the window remains below a predetermined limit.