Date: Thu, 19 Aug 2010 08:48:00

Author: Paul Doherty

Subject: Re: Safe Use of a 40mW laser


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At the Exploratorium we have the precious resource of DARK .

In the dark we can use a 1 mW laser to make a diffraction pattern.
Visitors are also able to get close to the screen.
We try to make it safer by having the beam skim 1 cm above a table =20
surface for it's entire path from laser to screen.
That way no one can place an eye in the beam.
(We still have to worry about specular reflection from mirrors =20
inserted into the beam, but so far that has not happened in 2 decades.)

Paul Doherty

On Aug 19, 2010, at 8:32 AM, Cliff Bettis wrote:

> I decided to make a mount that was well above eye level in the =20
> hall. Our resident laser safety expert is giving me advice about =20
> this and I=92ll pass along what he says when I get his opinion.
> album=3D4&pos=3D0
> Cliff

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DohertyOn Aug 19, =
2010, at 8:32 AM, Cliff Bettis wrote: