Date: Fri, 02 Feb 2001 13:38:35 -0500

Author: "Ramon O. Torres-Isea"

Subject: Re: Michelson Interferometer problems

Post:

Scott,

Just a re-write of my previous unintelligible message so that it makes sense:

HAVE (not "How" as in my previous message) you checked the long screw controlled
by the micrometer (i.e, the one that moves the mirror)?
And, of course, the micrometer itself?

That is (as Tim Cook also suggested) make sure that all "linkages" are working
correctly.

Ramón O. Torres-Isea
--
Supervisor, Advanced Physics Laboratories
Department of Physics,
The University of Michigan,
Ann Arbor, MI

Phone: 734-764-3443
E-mail: rtorres@umich.edu


"Ramon O. Torres-Isea" wrote:

> Scott,
>
> This is a long shot, but I am speaking based on an experience I do not want to
> recall.
> How you checked the long screw controlled by the micrometer (i.e, the one that
> moves the mirror)?
> And, of course, the micrometer itself?
>
> You probably know to check all the alignment, and that the beam is coming back
> unto itself, with
> the "unexpanded" laser beam.
>
> Good Luck.
>
> Ramón O. Torres-Isea
> --
> Supervisor, Advanced Physics Laboratories
> Department of Physics,
> The University of Michigan,
> Ann Arbor, MI
>
> Phone: 734-764-3443
> E-mail: rtorres@umich.edu
>
> Scott Shelley wrote:
>
> > Hi everyone,
> >
> > I am having an incredibly difficult time getting our Michelson
> > interferometer working, much to the chagrin of a certain difficult faculty
> > member (but that's another story altogether).
> >
> > I am using a standard HeNe laser (1mW, I believe), expanded by a factor of
> > ten by two lenses I purchased from Pasco (not the most expensive lenses,
> > but the resulting beam seems pretty clean), incident upon our
> > interferometer. I have no problem getting the two beams to overlap, and I
> > am seeing some kind of fringes, but they don't move when I crank the
> > micrometer. I suspect that these fringes result from reflections from the
> > front and back faces of the silvered mirror, based upon the fact that each
> > beam exhibits fringes, even when the other beam is blocked.
> >
> > Can anyone offer me some wisdom to solve this problem before it costs me my
> > job? (OK, I'm exaggerating slightly...but it's really important that I get
> > this working)
> >
> > Scott

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