title: Experimental observations of the threshold-like onset of mode instabilities in high power fiber amplifiers.
abstract: We report on the observation and experimental characterization of a threshold-like onset of mode instabilities, i.e. an apparently random relative power content change of different transverse modes, occurring in originally single-mode high-power fiber amplifiers. Although the physical origin of this effect is not yet fully understood, we discuss possible explanations. Accordingly, several solutions are proposed in this paper to raise the threshold of this effect.
authors: Friedrich-Schiller-University Jena, Institute of Applied Physics, Jena, Germany. eidam@iap.uni-jena.de
authors: Tino
authors: T
authors: Eidam
authors: Christian
authors: C
authors: Wirth
authors: Cesar
authors: C
authors: Jauregui
authors: Fabian
authors: F
authors: Stutzki
authors: Florian
authors: F
authors: Jansen
authors: Hans-Jürgen
authors: HJ
authors: Otto
authors: Oliver
authors: O
authors: Schmidt
authors: Thomas
authors: T
authors: Schreiber
authors: Jens
authors: J
authors: Limpert
authors: Andreas
authors: A
authors: Tünnermann
mesh_terms: D000669:Amplifiers, Electronic; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*