Published a long-form post/article on my blog on:

This takes me back to a "previous life" when dealing with optics, and Fourier Optics, in particular, was my day job. I had written a version of this code well over a decade ago when I was diving deeper into Fourier Optics, and it was great to revisit the code–I actually wrote the whole thing from scratch as the old code was in Matlab and written by a much younger version of me!

It was so much fun writing it up into an article too. Hope you enjoy it.