title: Thermal modeling of gain competition in Yb-doped large-mode-area photonic-crystal fiber amplifier.
abstract: We propose a new model for gain competition effects in high-power fiber amplifiers, which accounts for the thermal effects of heat load on the doped core overlap of the propagating light field. The full-vectorial nature of the fiber modes is modeled by an embedded finite-element method modal solver, and the temperature profile is calculated by a simple and efficient radial heat propagation solver. The model is applied to a Yb³⁺-doped LPF45 air-clad photonic-crystal fiber amplifier for coand counter-propagating pumping setups, showing gain competition in conditions of severe heat load.
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Rosa
authors.forename: Enrico
authors.initials: E
authors.lastname: Coscelli
authors.forename: Federica
authors.initials: F
authors.lastname: Poli
authors.forename: Annamaria
authors.initials: A
authors.lastname: Cucinotta
authors.forename: Stefano
authors.initials: S
authors.lastname: Selleri