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Efficient and highly tunable second-harmonic generation in Z-cut periodically poled lithium niobate nanowaveguides

Abstract

Thin-film lithium-niobate-on-insulator (LNOI) has emerged as a superior integrated-photonics platform for linear, nonlinear, and electro-optics. Here we combine quasi-phase-matching, dispersion engineering, and tight mode confinement to realize nonlinear parametric processes with both high efficiency and wide wavelength tunability. On a millimeter-long, Z-cut LNOI waveguide, we demonstrate efficient ($1900 \pm 500\% \;{{\rm W}^{- 1}}\,{{\rm cm}^{- 2}}$) and highly tunable (${-}{1.71}\;{\rm nm/K}$) second-harmonic generation from 1530 to 1583 nm by type-0 quasi-phase-matching. Our technique is applicable to optical harmonic generation, quantum light sources, frequency conversion, and many other photonic information processes across visible to mid-IR spectral bands.

© 2020 Optical Society of America

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