Semiclassical Representation for Open Systems: Quantum Theory of the Laser
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In conventional models of a single-mode laser[1,2] the lasing atoms are considered motionless, or their motion is taken into account by introducing a given distribution of the frequencies of the atomic transitions, i.e., a given velocities distribution function. This distribution function is the equilibrium one and does not depend on time. Therefore, the atomic motion is treated as independent of the field. However, a number of papers have appeared (see reviews ) which show that strong laser fields change the motion of the atoms significantly. Here the field is treated as given, and it does not depend on the properties of the atom. Thus, the two particular cases of one problem, namely the problem of the interaction of two-level atoms with the resonant field, are considered independently.
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