Theory of Laser Radiation
I was asked to start this sekond week nonrelativistically with a theory of lasers. By this I mean the description of radiation in interaction with matter of negative (absolute) temperature. It is clear that for a treatment satisfactory for theorists we have to idealize the situation. Firstly we replace the atoms by two-level systems (spins) and ignore the other levels. Secondly we start with matter of T = -0 ∞ (all spins up, e.g. in the state of higher energy), which means we consider flashing ruby-lasers rather than continous Ne-He-lasers. Finally we shall ignore the atomistic structure of matter and treat it as a continuum.
KeywordsLaser Radiation Coherent State Interference Term Laser Material Absolute Phase
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