摘要
Optical frequency conversion based on the second-order nonlinearity(χ^((2))) only occurs in anisotropic media(or at interfaces) and thus is intrinsically polarization-dependent. But for practical applications, polarization-insensitive or independent operation is highly sought after. Here, by leveraging polarization coupling and second-order nonlinearity, we experimentally demonstrate a paradigm of TE/TM polarization-independent frequency upconversion, i.e., sum frequency generation, in the periodically poled lithium niobate-on-insulator ridge waveguide. The cascading of quasi-phase-matched polarization coupling and nonlinear frequency conversion is exploited. With a proper transverse electric field, TE and TM mode fundamental waves can be frequency-upconverted with an equal efficiency in the frequency converter. The proposed method may find ready application in all-optical wavelength conversion and upconversion detection technologies.
作者
丁婷婷
唐永志
孙雪芮
黄义文
江蓓
刘瑾
李志伟
郑远林
陈险峰
Tingting Ding;Yongzhi Tang;Xuerui Sun;Yiwen Huang;Bei Jiang;Jin Liu;Zhiwei Li;Yuanlin Zheng;Xianfeng Chen(School of Electronic and Electrical Engineering,Shanghai University of Engineering Science,Shanghai 201620,China;State Key Laboratory of Advanced Optical Communication Systems and Networks,School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China;Shanghai Research Center for Quantum Sciences,Shanghai 201315,China;Collaborative Innovation Center of Light Manipulation and Applications,Shandong Normal University,Jinan 250358,China)
基金
supported by the National Natural Science Foundation of China(Nos.12074252,12192252,62005159,62022058,61705127,and 12104289)
the National Key Research and Development Program of China(No.2018YFA0306301)
the Shanghai Municipal Science and Technology Major Project(No.2019SHZDZX01-ZX06)
the Shanghai Rising-Star Program(No.20QA1405400)
the Yangyang Development Fund.
