[ATM] NA, Quartz test

[Mike Lockwood <melockwo@uiuc.edu>]

Hi,

Richard wrote:
> I would think, like any optical system, the best performance will be
> over less than it's full field, so I would use an objective with a
> wider field than the mirror requires to fill it. Theta is bigger so
> Sin(Theta) is bigger so NA needs to be larger than the mirror needs to
> fill it. Mike will be along to correct me shortly :)

I am not sure what you mean by best performance.  So long as the 
objective focuses the incoming light into a spot that is the size of 
airy disk formed by the mirror under test or smaller, then it should 
work fine.  A spatial filter may be necessary.

I made sure the objective (singlet) overfilled the mirror (it was 
illumiated well past the edge) and that the illumination was 
reasonably uniform over the whole mirror.

On another note.....

I just finished making up a web page about a quartz disk I was asked 
to test.  I used mechanical measurement, contact interference testing, 
my collimator and a small telescope, and my reference sphere.  As I 
thought many of you might be interested, here's a link:

http://bi-staff.beckman.uiuc.edu/~melockwo/mirror_making/q6_test/q6_test.html

	Mike Lockwood


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