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From: mwg@petrus.UUCP (Mark Garrett)
Newsgroups: net.sci
Subject: Re: Questions on PHOTONS
Message-ID: <680@petrus.UUCP>
Date: Fri, 8-Nov-85 15:09:27 EST
Article-I.D.: petrus.680
Posted: Fri Nov  8 15:09:27 1985
Date-Received: Wed, 13-Nov-85 04:12:31 EST
References: <1092@mtuxo.UUCP> <679@petrus.UUCP>
Organization: Bell Communications Research, Inc
Lines: 12

++
> ....The light intensity inside
> does build up to very high levels.  However, it won't go on forever because
> all kinds of non-linear effects which were negligible for normal conditions
> have profound effects at high photon density.

Sorry, my mistake.  You don't need non-linear effects (although they exist)
to explain lasers.  When the energy put into the system by the pump equals
the losses due to the absorbtion and leakage (intentional and not), then
the equilibrium light intensity is reached.

-Mark