Larry Dighera wrote:
On Wed, 5 Jan 2005 23:30:57 -0500, "Happy Dog"

wrote in : :

"Larry Dighera" wrote in message
.. .
On Thu, 06 Jan 2005 03:52:02 GMT, Jose
wrote in ::

There may not be that many photons involved, but
they are all coming from the same direction, and that does count
for
something.

If I'm not mistaken, coherent laser light is all in phase.
Doesn't
that cause it to have more energy?

No. The energy is measured in watts like any other kind of power
source.

I was referring to the phenomenon of light coherence. There's an
explanation of it he

http://whatis.techtarget.com/definit...4527%2C00.html

And my point was that because the light of a laser is coherent (in
phase), it will provide more energy than an equally bright light
source whose radiation is out of phase. At least this is what I was
told by an EE.

No, the differrence is in power vs power/area. A given power laser or
other light source will put out that same power level. But, at the
target, the laser will result in a higher received power density,
measured in watts/meter squared.

Some targets that may resonate with the laser light frequency would
absorb more power, but that's a separate issue as well.

-Malcolm Teas