title: Tunable and switchable dual-wavelength mode-locked Tm3+-doped fiber laser based on a fiber taper.
abstract: We demonstrate a self-starting dual-wavelength mode-locked fiber laser at a 2 μm spectral region by using a fiber taper in a Tm3+-doped ring fiber cavity. The fiber taper fabricated with a flame brushing technique was used as a periodic filter with a modulation depth of ~3.61 dB and a modulation period of ~7.3 nm, respectively. Diverse dual-wavelength regimes including continuous wave (CW)/multi-soliton, soliton/multi-soliton, and soliton/soliton regimes were obtained by adjusting pump power. Wavelength tuning for the dual-wavelength was also precisely controllable through stretching the fiber taper carefully. The tuning range was ~7 nm which was limited by the modulation period of the taper. By inserting a 10.0 m dispersion compensation fiber (DCF) into the fiber cavity, a stable dual-wavelength dissipative-soliton operation was obtained at 2 μm spectral region for the first time.
authors.forename: Yazhou
authors.initials: Y
authors.lastname: Wang
authors.forename: Jianfeng
authors.initials: J
authors.lastname: Li
authors.forename: Bo
authors.initials: B
authors.lastname: Zhai
authors.forename: Yunxiao
authors.initials: Y
authors.lastname: Hu
authors.forename: Kundong
authors.initials: K
authors.lastname: Mo
authors.forename: Rongguo
authors.initials: R
authors.lastname: Lu
authors.forename: Yong
authors.initials: Y
authors.lastname: Liu