The inherent trade-off between efficiency and bandwidth of three-wave mixing processes in χ nonlinear waveguides is the major impediment for scaling down many well-established frequency conversion schemes onto the level of integrated photonic circuit. Here, we show that hybridization between modes of a silica microfiber and a LiNbO nanowaveguide, amalgamated with laminar χ patterning, offers an elegant approach for engineering broadband phase matching and high efficiency of three-wave mixing processes in an ultra-compact and natively fiber-integrated setup. We demonstrate exceptionally high normalized second harmonic generation (SHG) efficiency of up to η ≈ 460% W cm, combined with a large phase matching bandwidth of Δλ ≈ 100 nm (bandwidth-length product of Δλ · L ≈ 5 μm) near the telecom bands, and extraordinary adjustment flexibility.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6102234 | PMC |
| http://dx.doi.org/10.1038/s41598-018-31017-0 | DOI Listing |
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