PREPARATION AND CHARACTERIZATION OF OFF-CONGRUENT LITHIUM-NIOBATE CRYSTALS

被引:227
作者
BORDUI, PF [1 ]
NORWOOD, RG [1 ]
JUNDT, DH [1 ]
FEJER, MM [1 ]
机构
[1] STANFORD UNIV,DEPT APPL PHYS,STANFORD,CA 94305
关键词
D O I
10.1063/1.351308
中图分类号
O59 [应用物理学];
学科分类号
摘要
Vapor transport equilibration was used to prepare lithium niobate crystals of a variety of controlled off-congruent compositions. Crystals were characterized through measurement of the ferroelectric Curie temperature T(c) and measurement of the temperature for noncritical phase matching T(PM) of second-harmonic generation from both 1.064- and 1.32-mu-m laser sources. Across the majority of the single-phase region, both T(c) and T(PM) were observed to vary nearly linearly with Li/Nb ratio. The variation in T(PM) with Li/Nb ratio was observed to change direction within the single-phase region at some small but finite compositional interval away from the Li-rich phase boundary. Crystals equilibrated to the Li-rich phase boundary had excellent optical homogeneity. Preparation of Li-poor crystals was hampered by extremely slow lithium diffusivity and problems with second-phase precipitation.
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页码:875 / 879
页数:5
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