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Re: Re[4]: [ATM] On Axis Foucault



--- Richard <cnc@cncservo.co.uk> wrote:


> 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/>


Richard,
The people who made the first LUPI and used a cube
beamsplitter and wrote up their design in Applied
OPtics,clearly stated and warned that cube thickness
introduces limits on the quailty of the final
figure.Thinner is better.They ray traced it out.

Ric
> 



		
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