title: High-power continuous-wave upconversion fiber laser at room temperature.
abstract: We report cw laser emission of a Pr, Yb-doped ZrF(4)-BaF(2)-LaF(3)-AlF(3)-NaF fiber in the red spectral region. Laser emission was achieved on the transition P(0)(3)?F(2)(3)(lambda(L)=635 nm) with a Ti:sapphire pump laser tuned to lambda(p)=850 nm . A maximum output power of P(out)=675 mW was obtained at an incident pump power of P(in)=3.37 W . The output power was increased to P(out)=1020 mW when pumping with P(in)=5.51 W was provided by two Ti:sapphire lasers. A photon avalanche process was found to contribute strongly to the population of the upper laser level.
authors.forename: T
authors.initials: T
authors.lastname: Sandrock
authors.forename: H
authors.initials: H
authors.lastname: Scheife
authors.forename: E
authors.initials: E
authors.lastname: Heumann
authors.forename: G
authors.initials: G
authors.lastname: Huber