Method of producing single-polarized lithium tantalate...

Details Method of producing single-polarized lithium tantalate... Method of producing single-polarized lithium tantalate...

2008-05-20

2008-05-20

Kunemund, Robert (Department: 1792)

Single-crystal, oriented-crystal, and epitaxy growth processes;

Processes of growth with a subsequent step acting on the...

C117S003000, C117S941000

Reexamination Certificate

active

07374612

ABSTRACT:
A method of producing a lithium-tantalate crystal comprising, at least subjecting a single-polarized lithium-tantalate crystal wherein an optical absorption coefficient at a wave number of 3480 cm−1is 0.3 cm−1or less to a heat treatment under a reducing atmosphere at a temperature of not lower than 250° C. and not higher than Curie temperature and a single-polarized lithium-tantalate crystal wherein an optical absorption coefficient at a wave number of 3480 cm−1is 0.3 cm−1or less and an electric conductivity is 1×10−12Ω−1·cm−1or more. There can be provided a method of producing a single-polarized lithium-tantalate crystal in a short time efficiently wherein the surface charge generated due to a pyroelectric property can be decayed quickly by improving the electric conductivity and a single-polarized lithium-tantalate crystal.

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