Optics question: silvering the ID of a tube

Factual Questions
1

Can I get a first surface mirror in the form of a tube with its inner surface reflective? I want it quite shiny from 400 to 2000 nm wavelength, maybe 5 or 10 mm in diameter and 20 to 100 mm long. The optical figure is not very important, meaning it does not have to be an optically accurate cylindrical surface, but I do care about scattering. I want radiation traveling generally in one direction along the tube to remain isolated from radiation traveling generally in the opposite direction along the tube.

I have used solid silica rods and fibers, which work by total internal reflection, but can’t find any without absorption bands over this range. I also would like to handle bigger reflection angles than total internal reflection allows (that is I want this to have a higher N.A. than fibers typically do).

Thanks!

2

It’s a relatively straightforward process to mirror glass. Any decent sized city will have shops that specialize in re-silvering mirrors. They will be able to mirror the inside of a glass cylinder.

ETA:
Here’s a HS chemistry demonstration: http://chemmovies.unl.edu/chemistry/smallscale/SS075.html

3

hollow waveguides sounds like what you are looking for.

Here’s one company…Remote Sampling – PIKE Technologies

I’ve dealt with this sort of thing on occasion

I take it Near Infrared fiber optic cables isn’t going to work for you?

4

Wait, what was that bit about an index of refraction less than 1?