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

• DOI: 10.1364/ol.393445
• Publication Date: 2020-06-08T12:01:17Z
• Authors: Jia-Yang Chen; Chao Tang; Zhao-Hui Ma; Zhan Li; Yong Meng Sua; Yu-Ping Huang
• Keywords: Waveguide

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, tight mode confinement to realize nonlinear parametric processes with both high efficiency wide wavelength tunability. On millimeter-long, Z-cut LNOI waveguide, demonstrate efficient (1900±500%W-1cm-2) highly tunable (-1.71nm/K) second-harmonic generation from 1530 1583 nm by type-0 quasi-phase-matching. Our technique is applicable optical harmonic generation, quantum light sources, frequency conversion, many other photonic information across visible mid-IR spectral bands.