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Physics
Atomic and Condensed Matter
Confused about fluorescence at resonance
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[QUOTE="Malamala, post: 6347250, member: 649307"] [USER=87679]@f95toli[/USER] [USER=461323]@DrClaude[/USER] thank you for your replies! I am actually new to this, so I am not totally sure I know what I mean either. Sorry for that! So one thing I think is getting me confused is that, from the derivations that I have seem for Rabi oscillations, it looks like the state being populated (assuming a 2 level system) is oscillating with time, so the final position depends on the time you stop the pulse. However from time dependent perturbation theory (from my QM class, Griffiths book) I remember that if you send a laser towards a 2 level system, you reach a steady state, where the rate of going to the upper state is equal to the rate of going to the lower state, so the number of electrons in the upper state will become (on average) constant. But as far as i understand, in the case of Rabi oscillations, you move all the electrons at once i.e. they are all in the upper state then lower state and so on, so you never reach a steady state. I am not totally sure what am I missing, or how to combine the 2 pictures (which seem to be contradicting). Thank you! [/QUOTE]
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Atomic and Condensed Matter
Confused about fluorescence at resonance
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