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

Author: Paul Doherty

Subject: Re: Safe Use of a 40mW laser

Post:


--Apple-Mail-7--1016997515
Content-Transfer-Encoding: quoted-printable
Content-Type: text/plain;
charset=WINDOWS-1252;
delsp=yes;
format=flowed

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.)

http://exs.exploratorium.edu/exhibits/interference/

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.
>
> https://physicslearning2.colorado.edu/image/displayimage.php?=20
> album=3D4&pos=3D0
>
> Cliff


--Apple-Mail-7--1016997515
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html;
charset=WINDOWS-1252

http://exs.ex=
ploratorium.edu/exhibits/interference/Paul =
DohertyOn Aug 19, =
2010, at 8:32 AM, Cliff Bettis wrote:

Back