title: 2 kW incoherent beam combining of four narrow-linewidth photonic crystal fiber amplifiers.
abstract: We report on beam combining of four narrow-linewidth fiber amplifier chains, running at different wavelengths and each delivering 500 W optical output power. The main amplifier stage consists of a large mode area photonic crystal fiber. The four output beams of the amplifier chains are spectrally (incoherent) combined using a polarization-independent dielectric reflective diffraction grating to form an output beam of 2 kW continuous-wave optical power with good beam quality (M(2)x = 2.0, M(2)y = 1.8).
authors.affiliation: Friedrich-Schiller University, Institute of Applied Physics, Jena, Germany. christian.wirth@iof.fraunhofer.de
authors.forename: C
authors.initials: C
authors.lastname: Wirth
authors.forename: O
authors.initials: O
authors.lastname: Schmidt
authors.forename: I
authors.initials: I
authors.lastname: Tsybin
authors.forename: T
authors.initials: T
authors.lastname: Schreiber
authors.forename: T
authors.initials: T
authors.lastname: Peschel
authors.forename: F
authors.initials: F
authors.lastname: Brückner
authors.forename: T
authors.initials: T
authors.lastname: Clausnitzer
authors.forename: J
authors.initials: J
authors.lastname: Limpert
authors.forename: R
authors.initials: R
authors.lastname: Eberhardt
authors.forename: A
authors.initials: A
authors.lastname: Tünnermann
authors.forename: M
authors.initials: M
authors.lastname: Gowin
authors.forename: E
authors.initials: E
authors.lastname: ten Have
authors.forename: K
authors.initials: K
authors.lastname: Ludewigt
authors.forename: M
authors.initials: M
authors.lastname: Jung