title: High-power graphene mode-locked Tm/Ho co-doped fiber laser with evanescent field interaction.
abstract: Mid-infrared ultrafast fiber lasers are valuable for various applications, including chemical and biomedical sensing, material processing and military applications. Here, we report all-fiber high-power graphene mode-locked Tm/Ho co-doped fiber laser at long wavelength with evanescent field interaction. Ultrafast pulses up to 7.8 MHz are generated at a center wavelength of 1879.4 nm, with a pulse width of 4.7 ps. A graphene absorber integrated with a side-polished fiber can increase the damage threshold significantly. Harmonics mode-locking can be obtained till to the 21(th) harmonics at a pump power of above 500 mW. By using one stage amplifier in the anomalous dispersion regime, the laser can be amplified up to 450 mW and the narrowest pulse duration of 1.4 ps can be obtained simultaneously. Our work paves the way to graphene Tm/Ho co-doped mode-locked all-fiber master oscillator power amplifiers as potentially efficient and economic laser sources for high-power laser applications, such as special material processing and nonlinear optical studies.
authors.affiliation: Center for OptoElectronics and Biophotonics, School of Electrical and Electronic Engineering &The Photonics Institute, Nanyang Technological University, 50 Nanyang Ave., 639798, Singapore.|School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, P.R. China.
authors.forename: Xiaohui
authors.initials: X
authors.lastname: Li
authors.affiliation: Center for OptoElectronics and Biophotonics, School of Electrical and Electronic Engineering &The Photonics Institute, Nanyang Technological University, 50 Nanyang Ave., 639798, Singapore.
authors.forename: Xuechao
authors.initials: X
authors.lastname: Yu
authors.affiliation: Department of Micro- and Nanosciences, Aalto University, PO Box 13500, FI-00076 Aalto, Finland.
authors.forename: Zhipei
authors.initials: Z
authors.lastname: Sun
authors.affiliation: Center for OptoElectronics and Biophotonics, School of Electrical and Electronic Engineering &The Photonics Institute, Nanyang Technological University, 50 Nanyang Ave., 639798, Singapore.
authors.forename: Zhiyu
authors.initials: Z
authors.lastname: Yan
authors.affiliation: Center for OptoElectronics and Biophotonics, School of Electrical and Electronic Engineering &The Photonics Institute, Nanyang Technological University, 50 Nanyang Ave., 639798, Singapore.
authors.forename: Biao
authors.initials: B
authors.lastname: Sun
authors.affiliation: Center for OptoElectronics and Biophotonics, School of Electrical and Electronic Engineering &The Photonics Institute, Nanyang Technological University, 50 Nanyang Ave., 639798, Singapore.
authors.forename: Yuanbing
authors.initials: Y
authors.lastname: Cheng
authors.affiliation: Singapore Institute of Manufacturing Technology, 71 Nanyang Drive, 638075 Singapore.
authors.forename: Xia
authors.initials: X
authors.lastname: Yu
authors.affiliation: Singapore Institute of Manufacturing Technology, 71 Nanyang Drive, 638075 Singapore.
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Center for OptoElectronics and Biophotonics, School of Electrical and Electronic Engineering &The Photonics Institute, Nanyang Technological University, 50 Nanyang Ave., 639798, Singapore.
authors.forename: Qi Jie
authors.initials: QJ
authors.lastname: Wang