A paraxial wave propagation framework for python 2.7 . Created by Lars Melchior for the Institute for X-Ray Physics in Göttingen. Funded by SFB755.
Unfortunately, since this package has been created the ecosystem has moved on significantly, making it quite difficult to install. Someday, the build system and code should be modernized, but for now it is recommended to use the provided Docker image with Python 2.7. To run pypropagate on your system, first install Docker and then run
> docker build --tag pypropagate .To run a jupyter notebook server in the local notebooks directory, run the following command
docker run -it -p 8000:8000 -v $(pwd)/notebooks:/notebooks pypropagate jupyter notebook --ip 0.0.0.0 --allow-root --notebook-dir /notebooks --port 8000 --no-browserJupyter will then print a URL with the access token looking like http://(6a2983956721 or 127.0.0.1):8000/?token=<token> into the command line.
To access and authenticate the Jupyter server, open a browser replacing the hostname with localhost, e.g. http://localhost:8000/?token=<token>.
pip install pypropagate
- Python 2.7
- gcc >= 5.0 or compatible
- boost python
- xraylib
Python dependencies are installed automatically via pip.
For the full mathematical theory and example scripts see the included thesis. You can find the scripts from the publication in the notebooks directory of this repository.
PyPropagate is licenced under version 3 of the GNU General Public License. Third party contributions are strongly encouraged.
When using PyPropagate in your work it would be very appreciated to give us a citation. You can use the following BibTeX templates:
@article{Melchior:17,
author = {Lars Melchior and Tim Salditt},
journal = {Opt. Express},
keywords = {Pulses; Ultrafast phenomena; X-rays, soft x-rays, extreme ultraviolet (EUV); Propagation; Waves},
number = {25},
pages = {32090--32109},
publisher = {OSA},
title = {Finite difference methods for stationary and time-dependent X-ray propagation},
volume = {25},
month = {Dec},
year = {2017},
url = {http://www.opticsexpress.org/abstract.cfm?URI=oe-25-25-32090},
doi = {10.1364/OE.25.032090},
abstract = {We have generalized finite-difference (FD) simulations for time-dependent field propagation problems, in particular in view of ultra-short x-ray pulse propagation and dispersion. To this end, we first derive the stationary paraxial (parabolic) wave equation for the scalar field envelope in a more general manner than typically found in the literature. We then present an efficient FD implementation of propagators for different dimensionality for stationary field propagation, before we treat time-dependent problems by spectral decomposition, and suitable numerical sampling. We prove the validity of the numerical approach by comparison to analytical theory, using simple tractable propagation problems. Finally, we apply the framework to the problem of modal dispersion in X-ray waveguide. We show that X-ray waveguides can be considered as non-dispersive optical elements down to sub-femtosecond pulse width. Only when considering resonant absorption close to an X-ray absorption edge, we observe pronounced dispersion effects for experimentally achievable pulse widths. All code used for the work is made available as supplemental material.},
}