Re: [ATM] On Axis Foucault

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

Hi aneves,

Tuesday, June 14, 2005, 3:29:50 PM, you wrote:

asb> I am trying to make an on axis focault tester for
asb> testing F 2 and faster optics, and would like some 
asb> ideas on how to achieve on axis alignment of the slit
asb> and knife edge. I was tempted to use a beamsplitter, 
asb> but I am unsure because of the spherical aberation it might induce. Any Ideas?

Someone will step in and disagree, but I thought Focault was
unreliable below F/4. As for the beamsplitter, we've been
discussing this over in the yahoo interferometry group just
recently. Conclusion is that if a cube beamsplitter is used in
an interferometer such that both test and reference beams pass
through it, then the SA is nulled out. In your case I don't
think it would be nulled, so I would use a Pellicle instead.
See http://www.nationalphotocolor.com/

Meanwhile, I have the same problem.

1) I am making a spherical wave interferometer and the reference
element is an F/2 spherical mirror. I need to test the mirror
but I don't have an interferometer that will do it. Go to (1).


-- 

Best regards,
  Richard in the UK



_______________________________________________
ATM mailing list http://www.atmlist.net/