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From: Chuck Simmons
Organization: You jest.
X-Mailer: Mozilla 4.61 [en] (X11; U; Linux 2.0.33 i586)
Subject: Re: laser diode operating range
References: <3DD9B41E.A6D85CCB@webaccess.net> <3DD9C330.C045F4E3@webaccess.net> <_KjC9.email@example.com>
Date: Tue, 19 Nov 2002 13:40:46 GMT
NNTP-Posting-Date: Tue, 19 Nov 2002 05:40:46 PST
"Sir Charles W. Shults III" wrote:
> Well, a couple of my amateur friends have 24" reflector scopes... and CCD
> imagers are pretty common these days. But now I remember the connection- the
> interferometry is using the laser for mirror measurements, such as geometry and
More like it. I used the old white light tests when I did mirror making
years ago (which can be just as good). A friend of mine uses the
Hartmann test (a 19th century method) on completed telescpes in that
class (part of customer acceptance tests). This is a star test using a
Hartmann screen and has the advantage of finding problems with the
complete assembly which laser tests cannot do.
... The times have been,
That, when the brains were out,
the man would die. ... Macbeth
Chuck Simmons firstname.lastname@example.org
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