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The spectroscopic properties of a single, tightly trapped atom are studied,when the electronic levels are coupled by three laser fields in an $N$-shapedconfiguration of levels, whereby a $\Lambda$-type level system is weaklycoupled to a metastable state. We show that depending on the laser frequenciesthe response can be tuned from coherent population trapping at two-photonresonance to novel behaviour at three photon resonance, where the metastablestate can get almost unit occupation in a wide range of parameters. For certainparameter regimes the system switches spontaneously between dissipative andcoherent dynamics over long time scales

Quantum coherence and population trapping in three-photon processes