We propose and demonstrate a simple method to generate an all-fiber CVBs and LP01 mode switchable laser using a few-mode fiber Bragg grating. A few-mode circulator is used to output the excited high-order modes. By adjusting the temperature to change the laser wavelength in the cavity, switching of the fundamental mode and the radial and azimuthally polarized laser is realized and their efficiencies are 10.76% and 5.55%, respectively. The purity of the radial and the azimuthally polarized beam is higher than 98%. The working wavelength of the radial and the azimuthally polarized beam is 1549.6nm. The 30 dB bandwidth is less than 0.15 nm, and the side mode suppression ratio is more than 73dB.
We propose and demonstrate a method to generate and detect high-order Poincaré sphere beams. By adjusting the input homogeneous polarization states, arbitrary high-order Poincaré sphere beams are obtained. A one-to-one correspondence between the traditional Poincaré sphere beams and high-order Poincaré sphere beams is represented. The generation and detection of the high-order Poincaré sphere beams are realized simultaneously. Our research is helpful to deepen the understanding of the polarization states of light beams and provide useful ideas for the handling of optical experiments.
We propose and demonstrate a simple method to generate an all-fiber high-order transverse-mode switchable laser using a few-mode Bragg fiber grating (FM-FBG). The switchable output of the LP02 mode, LP11 mode, and LP01 modes is precisely realized by adjusting the operating wavelength in the cavity, which breaks through the limitation of only two low-order modes in most reports about all-fiber transverse-mode switchable lasers. The slope efficiencies for the three modes are 2.5%, 5.9%, and 9.3%, respectively. The central wavelengths of the lasers are 1530.2 nm, 1531.3 nm, and 1532.1 nm, respectively, and the corresponding side mode suppression ratios are -61 dB, -67 dB, and -65 dB, which ensures the purity of the modes. This work has huge potential applications in sensing, mode division multiplexing, optical communication, laser processing, and surface plasmon excitation.
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