2021/04/23 by O. Melchert, A. Demircan · 1 citation
Physics and Astronomy · #physics.optics #physics.comp-ph
paper · pdf · doi:10.1016/j.cpc.2021.108257
arxiv created 2021/04/23 · arxiv updated 2022/01/05
We present a flexible, open-source Python package for the accurate simulation of the z-propagation dynamics of ultrashort optical pulses in nonlinear waveguides, especially valid for few-cycle pulses and their interaction. The simulation approach is based on unidirectional propagation equations for the analytic signal. The provided software allows to account for dispersion, attenuation, four-wave mixing processes including, e.g., third-harmonic generation, and features various models for the Raman response. The propagation equations are solved on a periodic temporal domain. For z-propagation, a selection of pseudospectral methods is available. Propagation scenarios for a custom propagation constant and initial field pulses can either be specified in terms of a HDF5 based input file format or by direct implementation using a python script. We demonstrate the functionality for a test-case for which an exact solution is available, by reproducing exemplary results documented in the scientific literature, and a complex propagation scenario involving multiple pulses. The py-fmas code, its reference manual, an extended user guide, and further usage examples are available online at https://github.com/omelchert/py-fmas.