Efficient 671 nm red light generation in annealed proton-exchanged periodically poled LiNbO3 wavegui

• 作 者: Yunfei Niu Lei Yang Dongjie Guo Yan Chen Xiaoyang Li Gang Zhao Xiaopeng Hu
• 机 构: National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, and
• 出 处: 中国光学快报（英文版）
• 发表日期: 2020年11期
• 关键词: lithium niobate second-harmonic generation optical waveguides proton exchange

We report efficient generation of 671 nm red light based on quasi-phase-matched second harmonic generation of 1342 nm in LiNbO3 waveguides.The design method and fabrication process of the high-quality annealed proton-exchanged periodically poled channel waveguides were presented.A continuous-wave 1.71 mW red light was obtained with a single-pass conversion efficiency of 47％·W-1 ? cm-2,which is 88％that of the theoretical value.While for 1 mW quasi-continuous-laser input,the corresponding peak power being 2 W,the conversion efficiency reached up to 60％.Our results indicate that the annealed proton-exchanged periodically poled LiNbO3 wave-guide is promising for high-efficiency and low power consumption nonlinear generation of visible light.