摘要
In this work, we propose a new scheme to generate frequency-doubled vortex beams from a radially poled Li Nb O3 micro-ring resonator based on nonlinear Cherenkov radiation. The near-infrared fundamental wave is resonant in the micro-ring, while the second harmonic is emitted from the resonator along the Cherenkov phase-matching direction. The topological charge of the emitted second-harmonic vortex beam is determined by both the azimuthal order of the whispering galley modes and the number of nonlinear grating elements. The field distribution and the conversion efficiency of the emitted vortex beam are investigated.
作者
林晨
陈琰
李晓阳
杨磊
倪睿
赵刚
张勇
胡小鹏
祝世宁
Chen Lin;Yan Chen;Xiaoyang Li;Lei Yang;Rui Ni;Gang Zhao;Yong Zhang;Xiaopeng Hu;Shining Zhu(National Laboratory of Solid State Microstructures,College of Engineering and Applied Sciences,and School of Physics,Nanjing University,Nanjing 210093,China)
基金
supported by the National Key R&D Program of China(Nos.2019YFA0705000,2017YFA0303700 and 2017YFB0405204)
the National Natural Science Foundation of China(NSFC)(Nos.11674171,91950206,51890861 and 11627810)
the Leading-edge Technology Program of Jiangsu Natural Science Foundation(No.BK20192001)
the Key R&D Program of Guangdong Province(No.2018B030329001)
