2019•Chinese Optics LettersRequires access

Passively Q-switched cylindrical vector laser based on a black phosphorus saturable absorber

Zhiwen He Zhiwen He, Zheng Yang, Hongyan Liu Hongyan Liu, Mingkun Li Mingkun Li, Hua Lü, H. Zhang, Qingliang Feng Qingliang Feng, Dong Mao

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Abstract

We demonstrate an all-fiber Q-switched cylindrical vector laser based on a black phosphorus saturable absorber and a transverse mode converter. The saturable absorber is prepared by incorporating the polyvinyl alcohol with anti-oxidized black phosphorus nanosheets exfoliated in aqueous poly(dimethyldiallyl ammonium chloride) solution. The mode converter is composed of a tapered two-mode fiber and a single-mode fiber, and it can excite switchable azimuthally and radially polarized beams by modulating the input polarization. By enhancing the pump power from 64.68 to 174.82 mW, the repetition rate of the Q-switched azimuthally/radially polarized laser enlarges from 16.72/19.25 to 30.71/37.82 kHz.

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Key concepts: Saturable absorption, Materials science, Optics, Fiber laser, Black phosphorus, Laser, Ammonium dihydrogen phosphate, Polarization (electrochemistry)