[ATM] Aplanatic Beamsplitter Foucault

[Richard]

Hi don,

Wednesday, August 15, 2007, 6:10:25 PM, you wrote:

dc>   I make
dc>   pellicle beamsplitters using 0.0003" thick Mylar
dc>   glued to a flat frame

Just for clarity Don, it should be mentioned that the frame should be
glass or a low expansion metal and has to be lapped *optically* flat,
not nailed together from 2x4's :)

If the light in the original posters setup is following the same path
on the outgoing and return trips then I'm at a loss to see how a cube
beamsplitter could introduce any aberrations, but then I'm more used
to interferometry setups than focault.

-- 

Best regards,
  Richard in the UK