Method for making large-volume CaF.sub.2 single cystals with reduced scattering and improved laser stability, the crystals made by the method and uses thereof

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United States of America Patent

PATENT NO 7393409
APP PUB NO 20050211160A1
SERIAL NO

11063147

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Abstract

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The method provides CaF.sub.2 single crystals with low scattering, small refractive index differences and few small angle grain boundaries, which can be tempered at elevated temperatures. In the method a CaF.sub.2 starting material is heat-treated for at least five hours at temperatures between 1000.degree. C. and 1250.degree. C. and then sublimed at a sublimation temperature of at least 1100.degree. C. in a vacuum of at most 5*10.sub.-4 mbar to form a vapor. The vapor is condensed at a condensation temperature of at least 500.degree. C., which is at least 20.degree. C. below the sublimitation temperature, to form a condensate. Then a melt formed from the condensate is cooled in a controlled manner to obtain the single crystal, which is subsequently tempered. The method is preferably performed with a CaF.sub.2 starting material including waste material and cuttings from previously used melts.

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Patent Owner(s)

Patent OwnerAddress
HELLMA MATERIALS GMBH & CO KG07745 JENA

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kandler, Joerg Cospeda, DE 7 34
Menzel, Andreas Jena, DE 17 81
Mueller, Matthias Jena, DE 119 891
Ortmann, Lars Jena, DE 6 12
Parthier, Lutz Klein-Machnow, DE 32 112
Von, der Goenna Gordon Jena, DE 7 11

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