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

• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2019,（2）
• 页码范围: 16-20
• 页数: 5页
• 语种: 英文
• DOI: 10.3788/COL201917.020004

摘要

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.