title: Tm-doped fiber laser mode-locked by graphene-polymer composite.
abstract: We demonstrate mode-locking of a thulium-doped fiber laser operating at 1.94 μm, using a graphene-polymer based saturable absorber. The laser outputs 3.6 ps pulses, with ~0.4 nJ energy and an amplitude fluctuation ~0.5%, at 6.46 MHz. This is a simple, low-cost, stable and convenient laser oscillator for applications where eye-safe and low-photon-energy light sources are required, such as sensing and biomedical diagnostics.
authors.affiliation: Femtosecond Optics Group, Department of Physics, Imperial College London, Prince Consort Road, London SW7 2BW, UK.
authors.forename: M
authors.initials: M
authors.lastname: Zhang
authors.forename: E J R
authors.initials: EJ
authors.lastname: Kelleher
authors.forename: F
authors.initials: F
authors.lastname: Torrisi
authors.forename: Z
authors.initials: Z
authors.lastname: Sun
authors.forename: T
authors.initials: T
authors.lastname: Hasan
authors.forename: D
authors.initials: D
authors.lastname: Popa
authors.forename: F
authors.initials: F
authors.lastname: Wang
authors.forename: A C
authors.initials: AC
authors.lastname: Ferrari
authors.forename: S V
authors.initials: SV
authors.lastname: Popov
authors.forename: J R
authors.initials: JR
authors.lastname: Taylor