Revisiting Diffraction with an Apodized "Iris"

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AiryDiscus Contributing Member • Posts: 829
Revisiting Diffraction with an Apodized "Iris"
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Some time ago, there was a thread here discussing diffraction with an apodized iris:

https://www.dpreview.com/forums/post/59063452

I have implemented gaussian apodization in my Python optics module:

https://github.com/brandondube/prysm

Here are the numerically simulated results, for a circular aperture (the previous thread showed Goodman's analytic results for square apertures),

The familiar airy disk for a diffraction PSF

When apodized, the central region is widened and the rings are suppressed

This shows up how you would expect in MTF-space, low frequencies are less attenuated (that is usually the work of the rings, which are now gone) but high frequencies are lost (the central peak is wider).

I can repeat this through focus, with aberration content, noncircular apertures, etc...

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