Re: Laser beam

[Ludwik Kowalski <KowalskiL@MAIL.MONTCLAIR.EDU>]

This suggests an experiment with water in a container with
parallel windows. Or with a thick plexiglas plate.

Gordon Smith wrote:

> At 02:33 PM 10/14/99 -0500, you wrote:
> > What causes
> > this phenomenon? How to get rid of the annoying straight line? It
> > prevents me from doing something more interesting. Ordinary
> > scattering would produce an axially symmetric background, not
> > a straight line. ...
>
> Maybe something in the manufacture process of the glass (perhaps a surface
> effect caused by rollers?)  You could get a neat crosshair, maybe, by
> running it through two plates ;-)  This would give you a nice orientation
> setup for targeting purposes...