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Low-threshold single-wavelength all-fiber laser generating cylindrical vector beams using a few-mode fiber Bragg
Biao Sun1, Anting Wang, Lixin Xu
1Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei, China.
Abstract:
We propose and demonstrate a low-threshold single-wavelength all-fiber laser generating cylindrical vector beams using a few-mode fiber Bragg grating. Both radially and azimuthally polarized beams have been generated with very good modal symmetry and polarization purity higher than 94%. The radially and azimuthally polarized modes can be switched by simply adjusting the polarization controllers built in the fiber laser cavity. This fiber laser operates at a single wavelength of 1053 nm with a 3 dB linewidth of less than 0.02 nm, signal-to-background ratio of more than 55 dB, and a threshold as low as 16 mW. A new method for the polarization purity measurement is also proposed.
