Abstract

It is shown that the effect of hole-burning under conditions of coherent population oscillations as well as the pulse delay in a saturable absorber (a modification of the slow light effect) can be interpreted, in a comprehensive way, in terms of {\it intensity spectrum} of the and {\it intensity-related susceptibility} of the non-linear medium. The physical content of these effects is illustrated by a simple electric circuit with a non-linear resistor which realizes a full analog of the saturable absorber. In this case the effect of hole-burning in the absorption spectrum of the medium is converted in to the effect of hole-burning in the frequency dependence of resistance of the non-linear resistor and the effect of slow light -- in to the effect of slow current.

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