Efficient planar-type butt coupling of a proton-exchanged waveguide on a Z-cut LiTaO₃ substrate

Yasuo Kitaoka, Hidehiko Wada, Seiji Nishino, Kiminori Mizuuchi, Kazuhisa Yamamoto and Makoto Kato

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Abstract

A half-wave thin film was formed on the facet of a proton-exchanged waveguide by the oblique deposition of Ta₂O₅. Planar-type butt coupling of the waveguide on the z-cut LiTaO₃ substrate to the AlGaAs laser diode in transverse electric mode oscillation was realized with coupling efficiency as high as 53%.

Key words butt coupling - proton-exchanged waveguide - oblique deposition - thin film

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Efficient planar-type butt coupling of a proton-exchanged waveguide on a Z-cut LiTaO3 substrate

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Abstract

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Efficient planar-type butt coupling of a proton-exchanged waveguide on a Z-cut LiTaO₃ substrate