Single crystal of lithium niobate or tantalate and its optical element, and process and apparatus for producing an oxide single crystal
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United States of America Patent
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Oct 15, 2002
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N/A
app pub date -
Jan 5, 2001
filing date -
Mar 26, 1999
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Abstract
A stoichiometric single crystal of lithium niobate or lithium tantalate is produced by pulling a single crystal of lithium niobate or lithium tantalate having a molar fraction of Li.sub.2 O/(Nb.sub.2 O.sub.5 +Li.sub.2 O) or Li.sub.2 O/ (Ta.sub.2 O.sub.5 +Li.sub.2 O) of at least 0.490 and less than 0.500, from a melt of a composition having a molar excess of Li over a stoichiometric composition of lithium niobate or lithium tantalate. The single crystal has 0.1 to 3 mol % of at least one element selected from the group consisting of Mg, Zn, Sc and In based on a total amount of elements Nb and Li, or a total amount of elements Ta and Li. The single crystal has substantially no absorption in the visible light region.
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