Highly efficient second-harmonic generation in a double-layer thin-film lithium niobate waveguide  

作　　者：Yuan Li Xiuquan Zhang Lutong Cai Lin Zhang 

机构地区：[1]Tianjin University,School of Precision Instruments and Opto-Electronics Engineering,State Key Laboratory of Precision Measuring Technology and Instruments,Key Laboratory of Opto-Electronic Information Technology of Ministry of Education,Tianjin Key Laboratory of Integrated Opto-Electronics Technologies and Devices,Tianjin,China [2]Shandong University,Ministry of Education,Key Laboratory of Laser and Infrared System,Qingdao,China [3]Peng Cheng Laboratory,Shenzhen,China

出　　处：《Advanced Photonics Nexus》2024年第6期80-86,共7页先进光子学通讯(英文)

基　　金：support from the Advanced Integrated Optoelectronics Facility at Tianjin University.

摘　　要：Thin-film lithium niobate(LN)has emerged as an ideal platform for efficient nonlinear wave-mixing processes due to its strong quadratic nonlinearity and high optical confinement.We demonstrate unprecedentedly efficient second-harmonic generation(SHG)in a double-layer thin-film LN waveguide.The modal overlap between fundamental and second-harmonic waves is significantly enhanced by the polarization-reversed double layers,leading to a normalized conversion efficiency higher than 10,000%W-1 cm-2 in theory.Under the low-and high-power pumping conditions,the measured normalized and absolute conversion efficiencies are 9600%W-1 cm-2 and 85%,respectively,substantially higher than state-of-the-art values among the reported SHGs in thin-film LN waveguides.Our results hold great promise for the development of efficient and scalable nonlinear photonic devices,with applications including metrology and quantum information processing.

关 键 词：integrated optics second-harmonic generation lithium niobate 

分 类 号：TN2[电子电信—物理电子学]