In article ,
Andy Dingley writes:
On Sun, 5 Sep 2004 09:07:46 +0100, "troubleinstore"
wrote:

Just out of curiosity, what colour is the laser beam from these things.

There are two colours - both red. However the long wavelength red is
cheaper to make, and thus ubiquitous. The short wavelength red is at a
more sensitive part of the eye's reception and appears brighter for
the same power. You'd need to buy a Leica or something to get one.

There might be green ones before too long. Cheap non-red diode lasers
are getting much cheaper.

I don't have one but used one once. Always found myself needing
to make a mark at the beam point which was well out of reach.
Someone needs to make one which has a momentary beam power boost
button; 1kW pulse should be enough for the beam to burn a small
mark on most things ;-)

--
Andrew Gabriel