title: Modeling of transverse mode interaction in large-mode-area fiber amplifiers.
abstract: We model the transverse mode interaction in a large-mode-area fiber amplifier by solving the Fresnel wave equation including local gain saturation. In order to calculate the electric field distribution we apply a finite difference beam propagation method, which is followed by the derivation of the modal powers and modal polarization states. A polarization dependent mode amplification is found that is in good agreement with recent experimental results.
authors.affiliation: Laser Zentrum Hannover, Hollerithallee 8, 30419 Hannover, Germany. andermahr@uni-muenster.de
authors.forename: N
authors.initials: N
authors.lastname: Andermahr
authors.forename: C
authors.initials: C
authors.lastname: Fallnich