| 摘要 |
PROBLEM TO BE SOLVED: To provide method for manufacturing a fluorite crystal by which the crystal having a small quantity of impurity and a uniform refractive index can be manufactured. SOLUTION: The method for manufacturing the fluorite crystal wherein the fluorite crystal is manufactured in a vacuum vessel is characterized in that a degassing from a constituent member of the vacuum vessel is performed by providing a means for degassing the gas from the outside of an insulating member. COPYRIGHT: (C)2004,JPO
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