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  • Title: Thermally tunable and efficient second-harmonic generation on thin-film lithium niobate with integrated micro-heater.
    Author: Liu X, Zhang C, Pan Y, Ma R, Zhang X, Chen M, Liu L, Xie Z, Zhu S, Yu S, Cai X.
    Journal: Opt Lett; 2022 Oct 01; 47(19):4921-4924. PubMed ID: 36181151.
    Abstract:
    In this Letter, we report thermo-optic tunable and efficient second-harmonic generation (SHG) based on an X-cut periodically poled lithium niobate (PPLN) waveguide. By applying an on-chip heater with thermo-isolation trenches and combining a type-0 quasi-phase matching mechanism, we experimentally achieve a high on-chip SHG conversion efficiency of 2500-3000% W-1 cm-2 and a large tuning power efficiency of 94 pm/mW inside a single 5-mm-long straight PPLN waveguide. Our design is for energy-efficient, high-performance nonlinear applications, such as wavelength conversion, highly tunable coherent light sources, and photon-pair generation.
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