Summary form only given. Recently, we achieved backward second-harmonic generation (SHG) in periodically-poled bulk LiNbO/sub 3/ (PPLN). We have improved the conversion efficiency by about an order of magnitude by using long laser pulses. Here, we report our new results of backward SHG by using periodically-poled potassium titanyl phosphate (PPKTP) waveguide. More importantly, we report our results on first observation of backward third-harmonic generation (THG) due to completely quasi-phase-matched cascaded SHG and sum-frequency generation (SFG) in PPKTP waveguide. This is the first time to achieve backward effective THG where both of SHG and SFG are quasi-phase-matched. Previously, we observed backward THG in PPLN by cascading SHG and SFG. However, only one of these two constituent processes is quasi-phase-matched.


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    Title :

    Observation of backward effective third-harmonic generation by cascading completely quasi-phase-matched backward second-harmonic and sum-frequency generation in periodically-poled potassium titanyl phosphate waveguide


    Contributors:
    Xinhua Gu, (author) / Makarov, M. (author) / Ding, Y.J. (author) / Khurgin, J.B. (author) / Risk, W.P. (author)


    Publication date :

    1999-01-01


    Size :

    151986 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English





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