473326a7$1@news.povray.org...
>
> I don't actually know how those work. I was under the impression that it 
> works by exciting atoms so that they emit photons - much the same way a 
> lump of iron glows if you put it in a hot fire. (But with some mirrors in 
> there to ensure the light only travels in one direction...)

AFAIK The optical cavity between the 2 mirrors works as a resonator or as an 
amplifier with an amount (one of the mirrors is semi-reflective to allow 
output) of reinjection of output into input.

Marc

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