Optical: systems and elements – Optical frequency converter – Dielectric optical waveguide type
Patent
1993-01-25
1995-05-02
Lee, John D.
Optical: systems and elements
Optical frequency converter
Dielectric optical waveguide type
359328, 385122, G02F 137
Patent
active
054125022
ABSTRACT:
Using an LiTaO.sub.3 or LiNbO.sub.3 substrate, a proton exchange layer in a grid pattern, namely sprout areas of polarization inversion, is firstly, formed on the surface of said substrate and, after formation of the pattern, heat treatment is executed at a temperature of 200.degree. C. or more and for a holding time of 10 minutes or less. By maintaining the temperature gradient up to said heat treatment point at 50.degree. C./min. or steeper and by maintaining the temperature decrease rate from said heat treatment point at 50.degree. C./min. or faster, polarization inverted areas are formed downwards from the proton exchanged areas, while in addition to making the top ends of said polarization inverted areas into an acute angle, the depth/weight ratio of the polarization inverted grids being formed is made to exceed 1, thus enabling the production of a high-efficiency SHG element.
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Kiminori Mizuuchi, et al., Second-Harmonic Generation of Blue Light in a LiTaO.sub.3 Waveguide, American Institute of Physics, Appl. Phys. Lett., vol. 58, No. 24, Jun. 17, 1991, pp. 2732-2734.
M. Yamada et al., Fabrication of Periodically Reversed Domain Structure for SHG in LiNbO.sub.3 by Direct Electron Beam Lithography at Room Temperature, Electronics Letters, vol. 27, No. 10, May 9, 1991, pp. 828-829.
Kiminori Mizuuchi, et al., Fabrication of First-Order Periodically Domain-Inverted Structure in LiTaO.sub.3, American Institute of Physics, Appl. Phys. Lett., vol. 59, No. 13, Sep. 23, 1991, pp. 1538-1540.
Furukawa Yasuhiro
Ito Kenchi
Ito Kohei
Kawamoto Kazutami
Makio Satoshi
Hitachi , Ltd.
Hitachi Metals Ltd.
Lee John D.
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