Second harmonic generation in a <i>domain-inverted</i> MgO-doped LiNbO3 waveguide by using a polarization axis inclined substrate

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  • Shinichiro Sonoda
    Miyanodai Technology Development Center, Fuji Photo Film Co., Ltd., 798, Miyanodai, Kaisei-machi, Ashigarakami-gun, Kanagawa 258, Japan
  • Isao Tsuruma
    Miyanodai Technology Development Center, Fuji Photo Film Co., Ltd., 798, Miyanodai, Kaisei-machi, Ashigarakami-gun, Kanagawa 258, Japan
  • Masami Hatori
    Miyanodai Technology Development Center, Fuji Photo Film Co., Ltd., 798, Miyanodai, Kaisei-machi, Ashigarakami-gun, Kanagawa 258, Japan

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<jats:p>We demonstrate quasiphase matched second harmonic generation by use of annealed proton-exchanged 87° Z-cut MgO 5 mol % doped LiNbO3 (MgO:LN) waveguides supporting a TE-mode guided wave. Formation of a domain inversion was achieved by applying electric fields in 3° Y-cut and 87° Z-cut MgO:LN. In 3° Y-cut and 87° Z-cut MgO:LN substrates, a polarization axis inclines at an angle θ equal to 3° to the surface. The domain inversion was formed in a direction parallel to the polarization axis like needles stuck into the substrate. The depth of the domain inversion was 2.5 μm with a period of 4.75 μm. The depth was about 2.5 times deeper than that in X- and Y-cut substrate at an angle θ equal to 0°. By forming a waveguide on the domain-inverted substrate, a blue light of wavelength 475 nm, and a power of 37 mW has been obtained and a normalized second harmonic conversion efficiency was 300%/W cm2 with interaction length of 10 mm, using a tunable external cavity laser diode as a fundamental wave source.</jats:p>

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