Chinese Optics Letters, Vol. 18, Issue 7, 071902 (2020)
Frequency-doubled vortex beam emitter based on nonlinear Cherenkov radiation
Chen Lin, Yan Chen, Xiaoyang Li, Lei Yang, Rui Ni, Gang Zhao*, Yong Zhang, Xiaopeng Hu**, and Shining Zhu
- National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, and School of Physics, Nanjing University, Nanjing 210093, China
In this work, we propose a new scheme to generate frequency-doubled vortex beams from a radially poled LiNbO3 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.
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