Single crystal of lithium niobate or tantalate and its optical element, and process and apparatus for producing an oxide single crystal
AssigneeNational Institute for Research in Inorganic Materials
InventorsKenji Kitamura, Yasunori Furukawa, Shunji Takekawa, Shigeyuki Kimura
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Abstract
A single crystal of lithium niobate or lithium tantalate may be grown from a melt of a composition having a molar excess of Li compared to a melt having the stoichiometric amount of lithium, and having a molar fraction of Li2O/(Nb2O5+Li2O) or Li2O/(Ta2O5+Li2O) within a range of at least 0.490 and less than 0.500. The single crystal also has at least one element selected from the group consisting of Mg, Zn, Sc and In, in an amount of from 0.1 to 3.0 mol % based on the total amount of the elements, Nb and Li, or the total amount of the elements, Ta and Li.
Claims18
A single crystal of lithium niobate or lithium tantalate, grown from a melt of a composition having a molar excess of Li over a stoichiometric composition of lithium niobate or lithium tantalate, and having a molar fraction of Li2O/(Nb2O5+Li2O) or Li2O/(Ta2O5+Li2O) within a range of at least 0.490 and less than 0.500, and the single crystal has at least one element selected from the group consisting of Mg, Zn, Sc and In in an amount of from 0.1 to 3.0 mol % based on the total amount of the elements, Nb and Li, or the total amount of the elements, Ta and Li.
A single crystal of lithium niobate or lithium tantalate, grown from a melt of a composition having a molar excess of Li over a stoichiometric composition of lithium niobate or lithium tantalate, and having a molar fraction of Li2O/(Nb2O5+Li2O) or Li2O/(Ta2O5+Li2O) within a range of at least 0.490 and less than 0.500, and the single crystal has at least one element selected from the group consisting of Sc and In in an amount of from 0.1 to 3.0 mol % based on the total amount of the elements Nb and Li, or the total amount of the elements Ta and Li.
Dependencies are inferred from the claim text.