title: All-fiber phase actuator based on an erbium-doped fiber amplifier for coherent beam combining at 1064 nm.
abstract: Active phase control in fiber amplifiers is of considerable interest for low-noise single-frequency amplifiers and for coherent beam combining. We demonstrate phase control at 1064 nm by use of an erbium-doped fiber. We investigated the phase shift by guiding the beam through an erbium-doped fiber amplifier in a Mach-Zehnder configuration and applied the results to stabilize the relative phase of two ytterbium-doped fiber amplifiers. To the best of our knowledge, this is the first demonstration of an all-fiber coherent beam combining at 1064 nm employing an erbium-doped fiber as a phase actuator.
authors.affiliation: Laser Zentrum Hannover e V, Hannover, Germany. h.tuennermann@lzh.de
authors.forename: Henrik
authors.initials: H
authors.lastname: Tünnermann
authors.forename: Jörg
authors.initials: J
authors.lastname: Neumann
authors.forename: Dietmar
authors.initials: D
authors.lastname: Kracht
authors.forename: Peter
authors.initials: P
authors.lastname: Wessels