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In his celebrated 1916-17 papers in which he proposed the A and Bcoefficients for the spontaneous and stimulated emission of energy quanta fromexcited atoms, Einstein conjectured that stimulated emission involves therelease of individual quanta (later dubbed "photons") along the direction of anincident photon with the same energy, momentum, phase, and polarization stateas that of the incident photon. According to classical electrodynamics, ofcourse, an oscillating dipole must radiate an azimuthally symmetricelectromagnetic field around its axis of oscillation. Nevertheless, Einsteinsuggested that the release of stored energy from excited atoms in the form ofdiscrete quanta (photons) must be directional, and that, in the case ofstimulated emission, the direction of the emitted photon must coincide withthat of the incident photon. The goal of the present paper is to show that someof the prominent features of absorption and stimulated emission emerge fromMaxwellian electrodynamics in conjunction with the simple mass-and-spring modelof an atom known as the Lorentz oscillator model.

Absorption and Stimulated Emission by a Thin Slab Obeying the Lorentz Oscillator Model