title: Mid-infrared mode-locked pulse generation with multilayer black phosphorus as saturable absorber.
abstract: A mid-infrared saturable absorber mirror is successfully fabricated by transferring the mechanically exfoliated black phosphorus onto the gold-coated mirror. With the as-prepared black phosphorus saturable absorber mirror, a continuous-wave passively mode-locked Er:ZBLAN fiber laser is demonstrated at the wavelength of 2.8 μm, which delivers a maximum average output power of 613 mW, a repetition rate of 24 MHz, and a pulse duration of 42 ps. To the best of our knowledge, this is the first time a black phosphorus mode-locked laser at 2.8 μm wavelength has been demonstrated. Our results demonstrate the feasibility of black phosphorus flake as a new two-dimensional material for application in mid-infrared ultrafast photonics.
authors.forename: Zhipeng
authors.initials: Z
authors.lastname: Qin
authors.forename: Guoqiang
authors.initials: G
authors.lastname: Xie
authors.forename: Chujun
authors.initials: C
authors.lastname: Zhao
authors.forename: Shuangchun
authors.initials: S
authors.lastname: Wen
authors.forename: Peng
authors.initials: P
authors.lastname: Yuan
authors.forename: Liejia
authors.initials: L
authors.lastname: Qian