Method of making highly uniform low-stress single crystals with reduced scattering
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United States of America Patent
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Issued Date -
Sep 14, 2006
app pub date -
Mar 2, 2006
filing date -
Mar 8, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The method produces highly uniform, low-stress single crystals, especially of calcium fluoride. A single crystal drawn from a melt apparatus with a suitable process is cooled and subsequently subjected to a tempering step. The method is characterized by rapid cooling in a temperature range between less than or equal to 1300.degree. C. and greater than or equal to 1050.degree. C. with a cooling rate of greater than or equal to 10 K/h and preferably less than or equal to 60 K/h.
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