Standard asphere surface profiles about hcipy HOT 7 CLOSED

Maybe as a similar issue, how will we handle standard refractive index profiles? Do we make a separate glass.py file?

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Yes, I think it's a good idea to have a small library of these aspheric, conic and spherical surface sags. I'd keep it brief though. To make them useful outside of micro-optics would probably need more advanced optical propagation methods, which are not implemented now. Any more than the following?

• Even aspheric
• Even-odd aspheric
• Conic
• Spherical

For refractive indices. A wrapper to an existing library would be preferable for me, but I haven't seen any good ones. PyTMM looks okay, but that is not pip installable as far as I can see, and including it outright into HCIPy or a derivative is not possible due to their license. Maybe a few formulas for the most common glasses (BK7, SF11, ...) and a few general implementations (Sellmeier, ...), with coefficients as arguments? Into glass.py would be my choice as well.

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I think those surfaces are fine. I will add them in my current working branch in a separate surface file.

For the refractive index I think we may be able to use: https://github.com/HugoGuillen/refractiveindex.info-sqlite

This one has no license and has a relatively simple interface. It also allows you to look for materials within certain ranges of refractive indices.

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That one is also not pip-installable, and is also based on PyTMM, and as such, must also necessarily be GPL licensed, even though it says it's not. If you look in the code, a large part is copy-pasted with small modifications. You can not re-release a GPL code as non-licensed code or MIT licensed, even if you modify it. While officially, we wouldn't be directly breaking the license, we would do it indirectly.

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Well then it would be easiest to include several glasses by hand. I have already implemented a couple of Cauchy and Sellmeier equations.

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I have added the two standard glass catalogues from Schott and Ohara in my branch (fiber_LP_modes). Those were freely available from the website of Schott and Ohara. How should we order such files? Currently I just put them in the optics folder, like the xinetics influence functions. Should we add some Data folder at some point for these types of files?

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This has now been resolved in the new LP_fiber_modes branch, therefore I will close this issue.

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