ATM Epoxy mirrors - a piece of the puzzle

["Andersen, Clark R." <clanders@utmb.edu>]

There seem to be a variety of problems with the notion of epoxy-based
mirrors.  I've experimented a bit with the notion of spin-cast epoxy, and
there are several problems involved with achieving a smooth surface upon
hardening - but the idea's so attractive I haven't given up on it yet.

One objection which has been raised has been the coefficient of thermal
expansion of epoxy, apparently fairly high compared to glass.  I've just
experienced something of an "aha!" moment and believe I've found a solution.
Fiberglass suppliers sell carbon (graphite) fibers as well, and mention that
the properties of the carbon fibers will yield a composite which is
electrically and HEAT conductive.  It seems to me that the thermal
equilibration problem of an epoxy mirror could be solved neatly by mixing in
some finely chopped carbon fibers.  Just incidentally, this would also
increase the bulk stiffness of the composite, perhaps even the thermal
expansion as well.

A little down the line... did you hear that they've just discovered a method
of manufacturing carbon nanotubes in bulk relatively economically?  They
might be ideal for this sort of application.