this post was submitted on 02 Oct 2023
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... wait, how does that work? Total internal reflection happens at the boundary to a lower index of refraction.
My dumb person guess is that it needs to be in a perfectly straight line.
There's probably more to it.
Looks like it comes in spools.
https://www.ixblue.com/store/ixf-hcf-10-100-950/
I don't know the physics of it. I posted some info for the parent you responded to. My understanding is the applied physics is different from traditional fiber.
https://mpl.mpg.de/research-at-mpl/russell-emeritus-group/research/about-pcf/hollow-core-pcf
I don't know the physics well enough, but here is some general information.
https://en.m.wikipedia.org/wiki/Photonic-crystal_fiber
https://www.rp-photonics.com/hollow_core_fibers.html