Abstract
Stimulated emission is formulated in completely classical terms and is shown to occur in general only in nonlinear systems. Our approach is based on the frequency-dependent susceptibility, which in both the classical and quantum-mechanical descriptions is the main characteristic determining whether there is absorption or stimulated emission. By using Bom’s correspondence rule, we derive an expression for the lowest-order quantum correction to the classical susceptibility.
© 1987 Optical Society of America
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