Warp wrote:
> 
> J. Grimbert <jgr### [at] atos-groupcom> wrote:
> : Ok, I'm nit-picking here, and it's not really a surface but a media, but there
> : is such material that increase the strength of light while it is passing
> : through it (and/or even change it radically).
> 
>   Changing the frequency of the light is not the same thing as changing it's
> strength (ie. amplitude).
> 

And what is "optical pumping" in classical laser if it is not
increasing the number of photons (--> strength) ?

I may have misleaded you with the example of frequency change, but the
initial question was more generic than just increase of strength.
 (He gave an example of reverting the color...)

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