title: Ultrafast thulium-doped fiber-oscillator with pulse energy of 4.3 nJ.
abstract: A femtosecond fiber laser based on thulium-doped double-clad silica fiber with an internal dispersion compensation is presented that generates pulses at a center wavelength of 1976 nm with an energy of 4.3 nJ and a duration of 1.2 ps. The dechirped pulse duration is 294 fs. The pulse energy is more than 2 orders of magnitude above the pulse energy demonstrated previously. Mode locking is achieved using additive pulse mode locking, and dispersion compensation is facilitated by a grating stretcher arrangement.
authors.affiliation: Laser Zentrum Hannover e.V., Hollerithallee, Hannover, Germany. m.engelbrecht@lzh.de
authors.forename: Martin
authors.initials: M
authors.lastname: Engelbrecht
authors.forename: Frithjof
authors.initials: F
authors.lastname: Haxsen
authors.forename: Axel
authors.initials: A
authors.lastname: Ruehl
authors.forename: Dieter
authors.initials: D
authors.lastname: Wandt
authors.forename: Dietmar
authors.initials: D
authors.lastname: Kracht