We study spontaneous emission from an atom under the action of laser fields.We consider two different energy level diagrams. The first one consists of twolevels resonantly driven by laser radiation where either of levels may decay toa separate level. For such a system we show that the presence of the seconddecay channel may deteriorate the destructive interference occurring in case ofone decay channel because of Autler-Townes effect. The second diagramrepresents two two-level resonantly driven systems with the upper levelsdecaying to a common level. For this diagram we show that there is nointerference between the two decay channels when the laser fields are describedin the Fock representation, while in case of definite-phase classical fieldssuch interference takes place and is partially or completely destructive orconstructive depending on the initial conditions and on the mutual orientationof the spontaneous emission dipole moments.
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