Model and computational advancements to full vectorial Maxwell model for studying fiber amplifiers

We present both modeling and computational advancements to a unique three-dimensional discontinuous Petrov-Galerkin finite element model for the simulation of laser amplification in fiber amplifier. Our is based on time-harmonic Maxwell equations, it incorporates via an active dopant thermal effects coupling with heat equation. As full vectorial simulation, this distinguishes itself from other amplifier models that are typically posed as initial value problem make significantly more approximations. supports co-, counter-, bi-directional pumping configurations, well inhomogeneous anisotropic material properties. The longer-term goal effort study nonlinear phenomena prohibit achieving unprecedented power levels amplifiers, along validating typical approximations used lower-fidelity models. high-fidelity comes at cost high-order discretization many degrees freedom per wavelength. This necessary counter effect numerical pollution due high-frequency nature wave simulation. To computation feasible, we have developed novel longitudinal rescaling, using artificial parameters preserving certain quantities interest. tests demonstrate applicability utility scaled ytterbium-doped, step-index experiences heating. results coupled Maxwell/heat up 240 wavelengths.