[ATM] Zerodur Mirror foucault pic

[Bernard Maugoust <maugoust@free.fr>]

In message <5.2.0.9.1.20040721081706.00a09230@pvtnetworks.net>, 
 Andy Saulietis <iss@pvtnetworks.net> wrote:

> Re Zerodur blank,
> 
> >At $5000 starting it would take
> 
> A couple of years ago I needed to estimate the value of a finished
> Zerodur mirror 32" dia 4" thick. The mirror lab in Arizona said
> bulk Zerodur cost $7 per cubic inch..making the 32" worth about
> $28,500 even it was broken into pieces..;)
> 
> At $5000 for a similar volume 27" it's a *bargain*.

At the price you say, my 8", 0.7" thick mirror is worth $250 or therabout as
a blank... It's been good fun to grind and polish. FL is 42.32" (1075mm), F/D
is 5.26.

I'm slowly buiding a modern foucault tester with moving source to confirm its
optical quality (thus doubling or tripling its value, but piece not for sale
though).

I'd like to thank all the known and unknown people who contribute to sharing
information and software on this list and elsewhere.

I've uploaded one of the first foucault images I've taken. The source is a
470nm LED. The mirror seems to be quite dirty, and I hope it's not actually
that badly scratched. When I'm finished with the foucault readings (which
look somewhat promising), I might be all the more inclined to finish the
scope and mount. I envy some of you fast workers ;-)

http://www.atmlist.net/contrib/maugoust-at-free-dot-fr/Foucault%20Pics/fouc2.jpg

Feedback welcome,

And a whole load of cheers to the list maintainers for the new upload
facility. It's working fine even from an antiquated, exotic and alien OS.

Cheers

-- 
Bernard Maugoust 3°59'E 44°28'N

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