Ultra-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 ultra-efficient ($1900\pm 500\%$W${}^{-1}$cm${}^{-2}$) and highly tunable (-1.71 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 processing across visible to mid-IR spectral bands.

References in corpus (4)

• Ultrahigh-efficiency second-harmonic generation in nanophotonic PPLN waveguides
• Periodically poled thin film lithium niobate microring resonators with a second-harmonic generation efficiency of 250,000%/W
• Tailoring nonlinear processes for quantum optics with pulsed temporal-mode encodings
• Efficient second harmonic generation in nanophotonic GaAs-on-insulator waveguides

Cited by in corpus (5)

• Ultra-bright Quantum Photon Sources on Chip
• Ultra-low-power second-order nonlinear optics on a chip
• Ultra-broadband mid-infrared generation in dispersion-engineered thin-film lithium niobate
• Photon Conversion in Thin-film Lithium Niobate Nanowaveguides: A Noise Analysis
• High-efficiency On-chip Quantum Photon Source in Modal Phase-matched Lithium Niobate Nanowaveguide