Rotating wave approximation
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The rotating wave approximation is an approximation used in atom optics and magnetic resonance. In this approximation, terms in a Hamiltonian which oscillate rapidly are neglected. This is a valid approximation when the applied electromagnetic radiation is near resonance with an atomic resonance, and the intensity is low. Explicitly, terms in the Hamiltonians which oscillate with frequencies ωl + ω0, are neglected while terms which oscillate with frequencies ωl − ω0 are kept, where ωl is the light frequency, and ω0 is a transition frequency.
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