Using condensed chemicals to precondition lithium niobate and lithium tantalate crystals
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United States of America Patent
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Jun 3, 2008
Grant Date -
May 25, 2006
app pub date -
Dec 2, 2005
filing date -
May 25, 2004
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Abstract
Methods and apparatus for preconditioning a lithium niobate or lithium tantalate crystal. At least a portion of a surface of the crystal is covered with a condensed material including one or more active chemicals. The crystal is heated in a non-oxidizing environment above an activating temperature at which the active chemicals contribute to reducing the crystal beneath the covered surface portion. The crystal is cooled from above the activating temperature to below a quenching temperature at which the active chemicals become essentially inactive for reducing the crystal.
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