Ultrahigh-Efficiency Wavelength Conversion in Nanophotonic Periodically Poled Lithium Niobate Waveguides
Journal Article - Open Access
Harvard University Cambridge United States
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Periodically poled lithium niobate PPLN waveguides are a powerful platform for efficient wavelength conversion. Conventional PPLN converters, however, typically require long device lengths and high pump powers due to the limited nonlinear interaction strength. Here we use a nanostructured PPLN waveguide to demonstrate an ultrahigh normalized efficiency of 2600W cm2 for second-harmonic generationof 1.5 micro m radiation, more than 20 times higher than that in state-of-the-art diffused waveguides. This is achieved by a combination of sub-wavelength optical confinement and high-fidelity periodic poling at a first-order poling period of 4 micro m. Our highly integrated PPLN waveguides are promising for future chip-scale integration of classical and quantum photonic systems.
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