[Laser] Prediction of laser emision ?

[Capgi&Co]

After your answer, i look for QCD on the web but it seem to be link only
with high energy physics (gamma interraction with nucleon).

For electron states, like you i only found information about Hydrogen,
perhaps because it's the simplest element and we have to deal with screen
effect of the inner electron level.

I think about transition probability, it not seems to be the right way,
because probilities are the same for the rizing transition and the reverse.
In fact, the probality seems to deal with the intensity of the spectrum ray
in spontaneous emmision.

Like you said for laser effect it would be more interristing to studie the
(meta)stability of the ecxited states, but what kind of values quantify this
property ?

JM




----- Original Message -----
From: "Ian Carr-de Avelon" <avelon@emit.pl>
To: <undisclosed-recipients: ;>
Sent: Friday, April 12, 2002 2:21 PM
Subject: [Laser] Prediction of laser emision ?


> The field which deals with this is called quantum-chromo-dynamics. To lase
> you need almost stable excited states of electrons which a photon in close
> proximity will stimulate to emit another photon. The states can all be
> calculated, but I've only ever seen programs for the states for hydrogen
> in text books.
> Yours
> Ian
>
> "Capgi&Co" <capgi@club-internet.fr> Wrote:
> >Since some week I read all i can about laser (Web, books) and i am very
surprise that there is very few kind of laser (I visible or near spetrum).
(Ar, Kr, Ne, Cd, Cr, Cu, Au, CO2, N2, Rare Earth and Semiconductors)
> >Is it a physical limitation ?
> >Is there some predictive calculation to know if one other element ( like
Fe, Zn ...) is able to be use as a laser medium ?
> >I look in atomic transition probability tables, but for instance i don't
find a maner to explain why Ar+ Kr+ or Cu++ lase.
> >Is there some one who heard about this kind of research.
> >What atom properties explain the stmulated emission and for some the
superradiance emission.
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