To: "J&S" 
Cc: atm{at}shore.net, owner-atm{at}shore.net
From: Hugues.Laroche{at}ses-astra.com
Reply-To: Hugues.Laroche{at}ses-astra.com



Thanks Jim,

>Dave Sleeter (are you still out there Dave?) did a good aggressive
>investigation into solving the "seeing contrasty fringes on aluminized
>surfaces" issue in the January - May 2002 timeframe,

...the thread was instructive.

This week-end I tried to test an aluminised flat with a water flat. My light source
was a green laser (532 nm) that I have used as-is and also made diffuse
with some plastic
stuff. Well, apart of interesting effects with the laser (for example the
horizontality
can be fine tuned very well by turning the leveling knobs up to the moment
the multiple reflections shrink to a single dot), I have seen absolutely
nothing
like fringes. I keep in mind the suggestion of Mark Holm to dye the water
to improve contrast for the next attempt.

Is the water layer thickness very critical? I have tried to thin in very much,
to the point that the slighest bump gave impressive waves at the mirror's surface!

Clear skies,

Hugues




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