Re: combining laser beams

[Herbert H Gottlieb <herbgottlieb@JUNO.COM>]

On Wed, 11 Dec 2002 21:25:39 -0500 Ludwik Kowalski
<kowalskil@MAIL.MONTCLAIR.EDU> writes:
> I forgot to add the obvious, the "amplifier" must received
> energy to populate excited levels. I suppose this can
> be done with visible non-coherent light.

Please explain a possible mechanism by which non-coherent
light can provide the energy to to populate ther excited levels
Has it ever been done already?   If so, where can I find out
more about it?

Thanks

Herb Gottlieb  from New York City
(Where such information is unavailable in my immediate personal
resources)