A novel structure for a quasi-phase-matched-second harmonic generation (QPM-SHG) device with a high-index-clad waveguide is shown. The periodic domain inversion was fabricated in LiTaO/sub 3/ using selective proton-exchange followed by quick heat treatment, which has advantages of uniform periodicity over large area, and is a good combination with a low loss proton-exchanged waveguide. To achieve strong confinement and efficient overlap between fundamental and SH wave, we have proposed a high-index-clad waveguide, Using a Nb/sub 2/O/sub 5/ film as the clad layer, harmonic blue light of 10 mW at a wavelength of 425 nm was obtained for a conversion efficiency of 280% W. Recently, to achieve further improvement in conversion efficiency and output power, we focused our attention on X-cut MgO:LiNbO/sub 3/, which has advantages of larger nonlinear coefficient, higher damage threshold, and potential to achieve low-loss coupling with the laser diode of transverse-electric mode oscillation. We have succeeded in fabricating a first-order QPM waveguide in X-cut MgO:LiNbO/sub 3/ utilizing two-dimensional high-voltage application that produces deep domains with uniform periodicity over long interaction length. Using this domain structure with the high-index-clad proton-exchanged waveguide, efficient harmonic blue light of 5.5 mW at 434 nm wavelength was generated for a normalized conversion efficiency of 1200% W.cm/sup 2/.


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    Title :

    Frequency doubling: blue light and UV generation in periodically poled LiTaO/sub 3// LiNbO/sub 3/


    Contributors:
    Mizuuchi, K. (author) / Yamamoto, K. (author) / Kitaoka, Y. (author) / Kato, M. (author)


    Publication date :

    1997-01-01


    Size :

    184378 byte





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



    Frequency Doubling:Blue Light and UV Generation in Periodically Poled LiTaO~3/LiNbO~3

    IEEE; Lasers and Electro-Optics Society | British Library Conference Proceedings | 1997



    Periodically-Poled LiNbO~3 Waveguide Devices for Short-Wavelength Light Generation

    IEEE; Lasers and Electro-Optics Society | British Library Conference Proceedings | 1997



    Periodically poled stoichiometric LiTaO/sub 3/ for optical parametric oscillation

    Yu, N.E. / Kurimura, S. / Nakamura, M. et al. | IEEE | 2003