"Cecil Moore" wrote
...
On Jul 1, 1:14 am, "Szczepan Bialek" wrote:
"Cecil Moore" wrotenews:a75e79a9-d0fd-4717-a451-
Laser light can usually be considered to be coherent light

No. People produce the coherent light in :
http://en.wikipedia.org/wiki/File:HalbachArrayFEL.png

You say lasers are not coherent and then post the url containing
"Description: Free Electron Laser Diagram"?

Free electron laser it is a quite different thing than laser.

The free electron laser produces the "laser-like" light:

" As the electrons are undergoing acceleration they radiate electromagnetic
energy in their flight direction, and as they interact with the light
already emitted, photons along its line are emitted in phase, resulting in a
"laser-like" monocromatic and coherent beam". From:
http://en.wikipedia.org/wiki/Halbach_array
S*