Re: [ATM] Aplanatic Beamsplitter Foucault

[don clement <donald_clement@yahoo.com>]

 A thin pellicle beamsplitter would be one solution
  to
  cube beamsplitter spherical aberration. I make
  pellicle beamsplitters using 0.0003" thick Mylar
  glued
  to a flat frame and then heating the Mylar with a
  heat
  gun that stretches the material taut.
  
  Don Clement
  Running Springs, California

> 
> --- aneves <aneves@snowsoft.biz> wrote:
> 
> > 
> > Hi All,
> > 
> > I've always wanted to have on axis foucault tester
> > that could be used in an autocollimation setup
> > without inducing astigmatism on short focus
> optics.
> > The idea of using a cube beamsplitter in the setup
> > was always brushed off, since a thick plate would
> > induce spherical aberation into the setup. I
> decided
> > to build a aplanatic cube beamsplitter where the
> > front face of the cube is ground to the shape of a
> > convex lens and the other surfaces to a concave
> > shape. With oslo I came to a setup that indicated
> > that this aplanatic beam splitter would not induce
> > spherical aberation. I have started grinding the
> > cube, but since I am no expert in Optical design,
> > I've been wondering  I am overlooking something!
> Can
> > anyone shed some light as if this setup will
> really
> > work.
> > 
> > Regards,
> > 
> > Alfredo
> > 
> > _______________________________________________




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