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:
May. 25, 2004
Filed:
Aug. 28, 2002
Joerg Kandler, Jena, DE;
Ewald Moersen, Mainz, DE;
Burkhard Speit, Jena, DE;
Harry Bauer, Aalen-Ebnat, DE;
Thure Boehm, Aalen, DE;
Eric Eva, Aalen, DE;
Michael Thier, Moegglingen, DE;
Hexin Wang, Koenigsbronn, DE;
Frank Richter, Lenzburg, CH;
Hans-Josef Paus, Stuttgart, DE;
Other;
Abstract
A method of making a fracture-resistant large-size calcium fluoride single crystal is described, which is suitable for an optical component for radiation in the far UV range. The calcium fluoride raw material for the single crystal is first melted and subsequently solidified by cooling the melt to form a single crystal. However the calcium fluoride raw material is doped with from 1 to 250, preferably 1 to 100, ppm of strontium, preferably added as strontium fluoride, and contains from 1 to 10 ppm of sodium as well as up to 100 ppm of other impurities.