30560Re: TMB Quartz Diagonals
- Apr 1, 2006--- In email@example.com, "rwiederrich" <rwiederrich@...>
> > It is very simple really. Quartz is the best substrate for a
> > diagonal mirror, period. It takes a better polish, has a very
> > low thermal coefficient of expansion, and the wavefront is better
> > for two reasons. One, it polishes better, and two, it is a very
> > hard (and in our case very thick) material, and the dielectric
> > coatings do stress a mirror, but our thick quartz mirrors are
> > very resistant to this coating stress.
> > Disadvantages? I can't think of any.
> > Thomas Back
> Thomas, the only *disadvantage* that comes to mind is how it puts a
> shadow on the competitions lesser quality product.
> Rob(can I say that on national TV?)
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