The absorption and stimulated emission of radiation
Starting from the absorption of radiation by a classical electron oscillator, Einstein's A and B coefficients for spontaneous and stimulated transitions are introduced. Stimulated transition rates are derived by time-dependent perturbation theory. Relations between the Einstein B coefficients and oscillator strengths are also determined. The atomic frequency response for stimulated transitions is explained.
Keywords: absorption, stimulated emission, Einstein A and B coefficients, time-dependent perturbation theory, oscillator strengths, atomic frequency response
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