Diffraction with Areal Quadrature, or diffraq, is a fast nonuniform Fourier method to calculate Fresnel diffraction via areal quadrature. The core algorithms are a translation of the code fresnaq (https://github.com/ahbarnett/fresnaq) into Python, and we shamelessly take many algorithms from there. In addition to the original fresnaq algorithms, diffraq adds various kinds of perturbations and vector diffraction effects.
To clone a copy and install:
git clone https://github.com/harnessa/diffraq
cd diffraq
python setup.py install
You'll need to set an environment variable which points to the diffraq install directory, e.g. (in bash):
export DIFFRAQ=${HOME}/repos/diffraq
You will need:
numpy <http://www.numpy.org/>scipy <https://www.scipy.org>finufft <https://github.com/flatironinstitute/finufft>h5py <http://www.h5py.org>
And optionally:
matplotlib <https://pypi.org/project/matplotlib/>pytest <https://pypi.org/project/pytest/>
If pytest is installed, testing can be done through:
sh $DIFFRAQ/tests/run_all_tests.sh
No public documentation yet :(
- Primary author: Anthony Harness (Princeton University)
- Author of original fresnaq code: Alex Barnett (Flatiron Institute)