Crystal manufacture method
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United States of America Patent
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Aug 16, 2005
Grant Date -
Aug 21, 2003
app pub date -
Feb 19, 2003
filing date -
Feb 19, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for manufacturing fluoride crystal includes the steps of adding scavenger and a material to a crucible, melting the scavenger and material at a temperature higher than a melting point so that a ratio of a thickness of the fluoride crystal that has been melted to an inner diameter of the crucible may be 0.2 or higher, and gradually crystallizing and purifying the material.
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