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Cylindrical vector beams (CVBs) with axial symmetry in both polarization and field intensity have attracted much attention because of their unique optical properties. Conventional methods to obtain CVBs including direct modulation of light beams in free space and high-order mode excitation by offset splicing single-mode fiber with few-mode fiber usually works at single wavelength with rather narrow...
We report an actively Q-switched fiber laser with cylindrical vector beam emission using a few-mode fiber Bragg grating as mode selection and acousto-optic modulator to achieve the ideal ns pulse. Both radially and azimuthally polarized beams have been obtained by tuning the polarization controllers. The generated Q-switched CVB operates at central wavelength of 1055.6 nm with a spectrum bandwidth...
We propose and demonstrate an all-fiber passively mode-locked laser with pulsed cylindrical vector beam output based on a mode selective coupler (MSC) in a figure-8 cavity, The MSC made of a two mode fiber and a standard single mode fiber is used as both the intracavity transverse mode converter and mode splitter. Through adjusting the polarization state in the laser cavity, both radially and azimuthally...
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