title: Sub-100  fs passively mode-locked holmium-doped fiber oscillator operating at 2.06  μm.
abstract: We demonstrate a simple and compact Holmium-doped fiber femtosecond oscillator, in-band pumped by a commercial Tm-doped fiber laser. The oscillator operates in the dispersion managed soliton regime at net zero intracavity dispersion and delivers >1  nJ pulse energy at 35 MHz repetition rate. The pulse duration directly at the oscillator output is 160 fs FWHM, close to the Fourier-limit of 145 fs FWHM. Using an additional nonlinear compressor stage, sub-100 fs FWHM pulse durations could be achieved. The nonlinear fiber compressor is implemented by a solid core highly nonlinear fiber for spectral broadening and a single mode fiber for pulse compression.
authors.forename: Peng
authors.initials: P
authors.lastname: Li
authors.forename: Axel
authors.initials: A
authors.lastname: Ruehl
authors.forename: Uwe
authors.initials: U
authors.lastname: Grosse-Wortmann
authors.forename: Ingmar
authors.initials: I
authors.lastname: Hartl
mesh_terms: D006695:Holmium; D007834:Lasers; D055100:Optical Fibers; D013997:Time Factors
chemical_list: D006695:Holmium