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  • Title: Second harmonic generation in nano-structured thin-film lithium niobate waveguides.
    Author: Wang C, Xiong X, Andrade N, Venkataraman V, Ren XF, Guo GC, Lončar M.
    Journal: Opt Express; 2017 Mar 20; 25(6):6963-6973. PubMed ID: 28381038.
    Abstract:
    Integrated thin-film lithium niobate platform has recently emerged as a promising candidate for next-generation, high-efficiency wavelength conversion systems that allow dense packaging and mass-production. Here we demonstrate efficient, phase-matched second harmonic generation in lithographically-defined thin-film lithium niobate waveguides with sub-micron dimensions. Both modal phase matching in fixed-width waveguides and quasi-phase matching in periodically grooved waveguides are theoretically proposed and experimentally demonstrated. Our low-loss (~3.0 dB/cm) nanowaveguides possess normalized conversion efficiencies as high as 41% W-1cm-2.
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