The spectroscopic properties of a single tightly trapped atom are studied, when the electronic levels are coupled by three laser fields in an N -shaped configuration of levels, whereby a Λ -type level system is weakly coupled to a metastable state. We show that depending on the laser frequencies the response can be tuned from coherent population trapping at two-photon resonance to a behavior at three photon resonance, where the metastable state can get almost unit occupation in a wide range of parameters. For certain parameter regimes the system switches spontaneously between dissipative and coherent dynamics over long time scales. © 2006 The American Physical Society.
|Journal||Physical Review A - Atomic, Molecular, and Optical Physics|
|Publication status||Published - 9 Nov 2006|