Optical vortex fiber laser based on modulation of transverse modes in two mode fiber
Dong Mao,
Mingkun Li,
Zhiwen He,
Xiaoqi Cui,
Hua Lu,
Wending Zhang,
Han Zhang,
Jianlin Zhao
Affiliations
Dong Mao
MOE Key Laboratory of Space Applied Physics and Chemistry; Shaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi’an 710072, China
Mingkun Li
MOE Key Laboratory of Space Applied Physics and Chemistry; Shaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi’an 710072, China
Zhiwen He
MOE Key Laboratory of Space Applied Physics and Chemistry; Shaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi’an 710072, China
Xiaoqi Cui
MOE Key Laboratory of Space Applied Physics and Chemistry; Shaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi’an 710072, China
Hua Lu
MOE Key Laboratory of Space Applied Physics and Chemistry; Shaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi’an 710072, China
Wending Zhang
MOE Key Laboratory of Space Applied Physics and Chemistry; Shaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi’an 710072, China
Han Zhang
Collaborative Innovation Centre for Optoelectronic Science & Technology, and Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen University, Shenzhen 518060, China
Jianlin Zhao
MOE Key Laboratory of Space Applied Physics and Chemistry; Shaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi’an 710072, China
Optical vortices, characterized by helical phase fronts, are usually generated outside the laser cavity using passive modulation methods. Here, we demonstrate an all-fiber laser to directly deliver mode-locked and continuous-wave vortex beams based on modulation of transverse modes in the two mode fiber. The mode couplers and reflectors for three schemes are long period fiber grating (LPFG) and fiber mirror, fiber taper and fiber Bragg grating, and LPFG and fiber Bragg grating, respectively. The laser is switchable between ±1 order vortex operations by tuning the intracavity polarization controller, and the optical vortex can directly work as an optical tweezer to manipulate rhenium diselenide nanosheets. The pulse duration at the mode-locked state is tunable from subpicoseconds to several picoseconds by spectral filters, and the maximum output power at the continuous-wave state exceeds 35 mW. The cost-effective all-fiber vortex laser is quite attractive for research of micromanipulation, spatiotemporal soliton, and optical communication.
