Patent application number | Description | Published |
20080198882 | Active cooling of crystal optics for increased laser lifetime - A laser beam is generated and transmitted within an enclosed pathway through at least one crystal optic at a power density that progressively degrades transmissivity of the crystal optic with accumulating fluence. The crystal optics are cooled below normal operating temperatures to slow the progressive degradation in the transmissivity of the crystal optics with the accumulating fluence or to accommodate a higher power density without correspondingly increasing the progressive degradation in transmissivity. | 08-21-2008 |
20090252947 | Three pressure hydrogen loading cycle for fused silica - A method of loading at least one fused silica article with hydrogen. At least one fused silica article is first loaded with an amount of hydrogen so that the hydrogen concentration at the center of the article exceeds a minimum concentration upon completion of loading. An amount of hydrogen is the removed from the fused silica article so that the fused silica article has an average hydrogen concentration that is less than the maximum average concentration limit. The surface region of the fused silica article is then reloaded to ensure that the hydrogen concentration throughout the article is within a predetermined pressure range. A fused silica article comprising hydrogen is also described. | 10-08-2009 |
20100108958 | CALCIUM FLUORIDE OPTICS WITH IMPROVED LASER DURABILITY - The invention is directed to calcium fluoride crystal optics with improved laser durability that can be used for the transmission of below 250 nanometer (nm) electromagnetic radiation. The optics consist of CaF | 05-06-2010 |
20100154474 | REDUCED STRIAE LOW EXPANSION GLASS AND ELEMENTS, AND A METHOD FOR MAKING SAME - The invention is directed to a method for reducing striae in ultra-low expansion glass, for example, silica-titania glass, by heat-treating the glass at temperatures above 1600° C. for a time in the range of 72-288 hours. The silica-titania glass is formed by substantially simultaneously forming, collecting and consolidating a silica-titania soot formed in one or a plurality of burners using silicon-containing feedstock and a titanium-containing feedstock. In one embodiment of the invention the glass is heat treated without forcing the glass to flow or “move”. The invention was found to reduce the magnitude of striae in an ultra-low expansion glass by at least 50%, and particularly reduces most of the “higher frequency” striae. | 06-24-2010 |
20120216565 | METHOD OF PRODUCING CONSTANCY OF COMPRESSIVE STRESS IN GLASS IN AN ION EXCHANGE PROCESS - The present disclosure is directed to a method for producing constancy of the ion-exchanged product stress profile through adjustment of ion-exchange conditions by taking account of the influence of salt bath poisoning on the bath's useful lifetime. The present disclosure is directed to a method of ion-exchange in which the salt bath temperature and salt bath time are adjusted as a function of the amount of alkali metal ions that exchange in the bath. That is, temperature and time are adjusted as a function of salt bath poisoning. Temperature is set to its highest value and time to its shortest value in the starting un-poisoned salt bath, those values chosen to hit target values of surface compressive stress and exchange depth of layer. Temperature is then reduced and time lengthened as salt bath poisoning proceeds, those changes chosen to maintain the same surface compressive stress and exchange depth of layer. | 08-30-2012 |
20120216569 | METHOD OF PRODUCING CONSTANCY OF COMPRESSIVE STRESS IN GLASS IN AN ION-EXCHANGE PROCESS - The present disclosure is directed to a method for producing constancy of the ion-exchanged product stress profile through adjustment of ion-exchange conditions by taking account of the influence of salt bath poisoning on the bath's useful lifetime. The present disclosure is directed to a method of ion-exchange in which the salt bath temperature and salt bath time are adjusted as a function of the amount of alkali metal ions that exchange in the bath. That is, temperature and time are adjusted as a function of salt bath poisoning. Temperature is set to its highest value and time to its shortest value in the starting unpoisoned salt bath, those values chosen to hit target values of surface compressive stress and exchange depth of layer. Temperature is then reduced and time lengthened as salt bath poisoning proceeds, those changes chosen to maintain the same surface compressive stress and exchange depth of layer. | 08-30-2012 |
20120319048 | CALCIUM FLUORIDE OPTICS WITH IMPROVED LASER DURABILITY - The invention is directed to calcium fluoride crystal optics with improved laser durability that can be used for the transmission of below 250 nanometer (nm) electromagnetic radiation. The optics consists of CaF | 12-20-2012 |
20140373571 | FUSED SILICA GLASS ARTICLE HAVING IMPROVED RESISTANCE TO LASER DAMAGE - A fused silica glass article having greater resistance to damage induced by exposure to laser radiation such as laser induced wavefront distortion at deep ultraviolet (DUV) wavelengths, and behaviors such as fluence dependent transmission, which are related to intrinsic defects in the glass. The improved resistance to laser damage may be achieved in some embodiments by loading the glass article with molecular hydrogen (H | 12-25-2014 |