[ATM] Sodium light

[Mike Lockwood <melockwo@uiuc.edu>]

Hi,

I wanted to thank everyone for their advice on interference testing 
and finding a low-pressure sodium source.  Currently I haven't gotten 
my hands on one, but my tester, using a red plexiglass filter, is 
currently giving fringes with good contrast.

A friend pointed out a place inside the "test booth" (immediately 
behind the two-way mirror) that was reflecting a good amount of light, 
and I put flocked paper on it last night.  This improved the contrast 
even more.  This setup will certainly do for making Cass secondaries, 
which is its first use.

Later on, I'd idealy like to be able to test coated secondaries, as I 
have heard this is doable with a bright source (I think there was a 
thread in the archives on this?).  Then I'll really want the 
low-pressure sodium.

My test setup is shown at

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

	Mike Lockwood

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