Re[4]: [ATM] On Axis Foucault

[Richard <cnc@cncservo.co.uk>]

Hi aplanatic,

Tuesday, June 14, 2005, 11:15:48 PM, you wrote:
 
aac> In the Foucault test the SA from a cube beam splitter
aac> is not cancelled by passing through the splitter twice. 
aac> Each pass through the beam splitter adds SA in the same
aac> direction.  
 
aac> The SA from a cube splitter is very significant for
aac> an f/2 system.  Just ray trace to find out.
 
Well, I just don't see it. I've looked at the ray trace for a
very similar layout for an interferometer and the SA most
definitely cancels. I agree, if it didn't cancel, it would be
very bad at F/2. But it does :)

See http://groups.yahoo.com/group/interferometry/message/1327

-- 

Best regards,
  Richard in the UK



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