Grating compression

[jtravs]

Adds prop_gratings to simply model a grating compressor.

• Add tests
• Add example

[chrisbrahms]

LGTM, just a minor docstring error. is this still WIP really?

[jtravs]

Yes, in that I haven't tested much, or added tests!

[chrisbrahms]

sorry, to clarify--is that still actually in progress, ie are you likely to have time to do it?

[jtravs]

Oh, I see! Yes, I plan to do it, when I get time... Tests are not totally trivial, because this includes the full phase, so cannot be directly compared to analytic formulas. So my plan was to manually build an example that I have manually checked and use that as a test basis.

[Copilot]

Pull request overview

Adds initial support for modeling and optimizing a 4-grating compressor in the Fields module, enabling grating-based spectral-phase propagation and an optimizer for peak-power compression.

Changes:

• Introduces prop_gratings! / prop_gratings to apply a grating-compressor spectral phase in the frequency domain.
• Adds optcomp_gratings to search grating separation L that maximizes peak power (via Optim.optimize), returning the optimal separation and compressed field.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

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[chrisbrahms]

I'm happy if you're happy. Please could you add this to #415 when you've merged?