this post was submitted on 02 Oct 2023
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What's hollow core fibre.
Its a type of fiber optic cable where the center of the cable is literally hollow. Normal fiber uses a glass core. Light passing through glass also travels about 2/3 the speed of the light since the speed of light is only constant in an empty vacuum. With hollow core, light is no longer passing through glass so its speed is much closer to the actual speed of light.
How do you get internal reflectance with a hollow core?
... 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