Date: Mon Nov 20 19:29:02 2006

Author: --- cbettis

Subject: Re: Interferometer


I have done both; I'd like to do it with just a visual observation. One thing
I thought of was fudging a bit by using a neutral density filter to make the
minimum just barely not visible. I am using an undiverged beam so I just see a
maximum or minimum no "bullseye".


Quoting Wolfgang Rueckner :

> Cliff -- are you actually measuring the intensity or visually
> observing it? Visually, the dark rings of the bull's-eye pattern
> should look pretty dark so that one can (at least qualitatively)
> claim that there's "no light visible." -- Wolfgang
> On Nov 20, 2006, at 4:35 PM, Cliff Bettis wrote:
> > Hi,
> >
> > A faculty member wants me to set up a Michelson interferometer.
> > That's no problem but he wants it so no light is visible at minimum
> > and then when you block either beam you see light. So far, as close
> > as I have come is about a 5 to ratio in intensity between max and
> > min. I am using a green laser with no divergence added, a
> > compensator plate , an optical table and am as near to equal paths
> > as I think I can get. The set up is also very sensitive to breath
> > and the heat of my hand.
> >
> > Does anyone have any advice? I am thinking he is asking for a lot
> > from a classroom demo although I am willing to try.
> >
> > Cliff
> >