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:
Feb. 19, 1991
Filed:
Dec. 18, 1989
John Bluege, Lake Park, FL (US);
United Technologies Corporation, Hartford, CT (US);
Abstract
A thermal distortion effect compensated mirror includes a mirror substrate having a reflective surface, and a compensating layer on the reflective surface. The compensating layer is of a material that is substantially transparent to a laser beam to be reflected by the mirror, and has such a thickness as to substantially compensate, during the passage of the laser beam therethrough, for the differences in the propagation path lengths of different laser beam regions impinging on and reflected from different portions of the reflective surface that have been displaced to different extents from their original positions by different thermal growths of the respective underlying zones of the substrate owing to different heating of such substrate zones by different energy levels of the associated laser beam regions.