Title:
THIN FILM OF LITHIUM NIOBATE SINGLE CRYSTAL
Document Type and Number:
Japanese Patent JPH0437697
Kind Code:
A
Abstract:
PURPOSE:To produce the title thin film having a small optical transmission loss and superior optical characteristics by forming a thin film of a lithium niobate single crystal on a lithium tantalate substrate added with an element other than Li and Ta to a part of the surface so that the lattice of the thin film is matched to that of the substrate. CONSTITUTION:An element other than Li and Ta, e.g. Mg or Ti is added to at least a part of the surface of a lithium tantalate substrate to form a pattern having a relatively low refractive index at a waveguide forming part. A thin film of a lithium niobate single crystal is then formed on the substrate so that the lattice of the thin film is matched to that of the substrate and a thin film of a lithium niobate single crystal having <=1.4dB/cm optical transmission loss is produced. Since the thin film formed on the above-mentioned pattern becomes a waveguide, a waveguide forming process can be eliminated.
Inventors:
ENOMOTO AKIRA
YAMADA MASAYA
ONO TETSUSHI
YAMADA MASAYA
ONO TETSUSHI
Application Number:
JP14179790A
Publication Date:
February 07, 1992
Filing Date:
May 30, 1990
Export Citation:
Assignee:
IBIDEN CO LTD
International Classes:
C30B19/00; C30B29/30; G02B6/13; (IPC1-7): C30B19/00; C30B29/30
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