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Re: Laser beam

At 1:42 PM -0500 10/14/99, 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. By the way, a slightly wider beam from a
>semiconducting laser pointer behaves the same way.
>Ludwik Kowalski


My guess would be that there is at least a little bit of scattering
at the entrance surface and then internal reflection takes over to
create the line????

Could be tested by reducing the internal reflection. Maybe by having
water or oil adjacent to most of the glass plate???

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