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30560Re: TMB Quartz Diagonals

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  • tmboptical
    Apr 1, 2006
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      --- In tmboptical@yahoogroups.com, "rwiederrich" <rwiederrich@...>
      wrote:
      >
      > >
      > > 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?)

      Thanks Rob.

      Thomas Back
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