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.

Platform: Python, using the functionality of numpy, scipy and matplotlib.

Read more and download the code from here:  
https://data.mendeley.com/datasets/7s2cv9kjfs/1

We prepared a Code Ocean capsule, allowing to directly run and modify an exemplary simulation without the need to create a local copy of the repository under the link:
https://codeocean.com/capsule/4971866/tree

The work is done by the team of Prof. Ayhan Demircan

Reference

[1] Melchert, Oliver and Demircan, Ayhan.  py-fmas: A python package for ultrashort optical pulse propagation in terms of forward models for the analytic signal.  Computer Physics Communications 273(2022): 108257.

[2] Melchert, Oliver et al. Resonant Kushi-comb-like multi-frequency radiation of oscillating two-color soliton molecules. New J. Phys. 25 (2023): 013003.

[3] Melchert, Oliver et al. (Invited) Two-color soliton meta-atoms and molecules. Optik 280 (2023): 170772.

[4] Melchert, Oliver and Demircan, Ayhan. Two-color pulse compounds in waveguides with a zero-nonlinearity point.  Opt. Lett. 48 (2023): 518.