Abstract
We have seen in the preceeding chapters that the problem of studying an optical process reduces to that of solving an appropriate master equation. However, barring the harmonic oscillator model of atoms, the master equations in question can seldom be tackled analytically exactly. This is particularly so when there are more than one frequencies coupling a transition. We identify in Chaps. 12 and 14 analytically exactly solvable atomic systems in which a transition is driven by only one frequency. In this chapter we discuss a perturbative approach to solving the master equation of an atomic system in which a transition may be driven by more than one frequency.
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