title: Femtosecond coherent seeding of a broadband Tm:fiber amplifier by an Er:fiber system.
abstract: We generate broadband pulses covering the Yb: and Tm:silica amplification ranges with a passively phase-locked front end based on Er:fiber technology. Full spectral coherence of the octave-spanning output from highly nonlinear germanosilicate bulk fibers is demonstrated. Seeding of a high-power Tm:fiber generates pulses with a clean spectral shape and a bandwidth of 50 nm at a center wavelength of 1.95 μm, pulse energy of 250 nJ, and repetition rate of 10 MHz.
authors.affiliation: Department of Physics and Center for Applied Photonics, University of Konstanz, Konstanz, Germany.
authors.forename: Sören
authors.initials: S
authors.lastname: Kumkar
authors.forename: Günther
authors.initials: G
authors.lastname: Krauss
authors.forename: Marcel
authors.initials: M
authors.lastname: Wunram
authors.forename: David
authors.initials: D
authors.lastname: Fehrenbacher
authors.forename: Umit
authors.initials: U
authors.lastname: Demirbas
authors.forename: Daniele
authors.initials: D
authors.lastname: Brida
authors.forename: Alfred
authors.initials: A
authors.lastname: Leitenstorfer