Curious about how a laser works?
How a Laser Works
And Why is it spelled "Laser" and not "Lazer"?
LASER acronym and History
What does Wikipedia have to say about lasers?
In-depth discussion of Laser engraving
Wiki's full entry on Lasers
Maybe you're looking for laser hair removal?
This used to work, but it doesn't anymore: www.starlightlaser.com
There is a new link for laser hair removal now: www.starlitelaser.ca.
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Cermark engraving compound on steel I-Beam. The Cermark is a ceramic spray that coats the surface to be engraved, and the laser "fires" the ceramic and bonds it to the surface of the metal.