Dressed-atom model

C. Dressed-Atom Model of the Amplification on Dark Transitions... 

Lee et al. [34] have shown that the physical origin of the cancellation of the central line in the spectrum can be explained clearly by the dressed-atom model of the system [35]. In this model we use a fully quantum-mechanical description of the Hamiltonian (65), which in a frame rotating with the laser frequency (0L can be written as... 

Fig. 8.34 Photon-assisted collisional energy transfer (a) molecular model (b) dressed-atom model...

In the atomic model (Fig. 8.34b, often called the dressed-atom model) [1090] the excited atom A absorbes a photon ho) of the transfer laser, which excites A further into a virtual state - -fuo that is near resonant with the excited state of B. The collisional energy transfer A -h -> B + AE kin with AE kin then proceeds with a much higher probability than the off-resonance process without photon absorption [1091]. 

An alternative description of the observed phenomena can be obtained by the dressed atom model [80]. In this approach the eigenvalues of the global system atom + field, the dressed states, are sought. The strong pump beam dresses the atom with laser photons which leads to energy levels split by the Rabi frequency. The resonances discussed in Fig. 20 then arise naturally as transitions between the (infinite) ladder of dressed states. The dressed atom model delivers a physically comprehensible description of atomic energy levels in strong fields and the reader is referred to Ref. 80 for a detailed presentation. 

The light shift of the resonance line of a single terrylene molecule was measured with a near-resonant pump (A > F) by either varying the pump intensity at a iked detuning or vice versa. As can be derived from a perturbative approach as well as from the dressed atom model, the light shift d for a near-resonant ptimp can be approximated (A > Qi) by the simple expression,... 

---

See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ ]

---