Complete electromagnetically induced transparency in sodium atoms excited by a multimode dye laser

Nonlinear magneto-optical resonances atD1excitation ofR85bandAuzinsh1, Ferber2, Gahbauer3 et al. 2009Phys. Rev. A

“…Bright resonances arise when atoms at zero magnetic field are prepared in a superposition of ground state sublevels that is strongly coupled to the excited state. These resonances have a variety of applications, such as in optical magnetometers [9] and optical switches [10], and they have been studied extensively in many systems both theoretically and experimentally (see, for example, [3,5,11,12,13,14,15,16,17,18,19,20,21]). However, accurately modelling the profiles of bright and dark resonances in systems that are unresolved under Doppler broadening remains a challenging enterprise.…”

“…Papoyan et al [18] studied bright and dark resonances in the D 2 transition of cesium, but their theoretical model based on the optical Bloch equations predicted a bright resonance for the F g = 4 → F e = 3, 4, 5 transition, which appeared to be dark in the experiment. Alzetta et al [19] excited the D 1 transition of sodium in a vapor cell with a broadband multi-mode laser to demonstrate dark resonances with 100% contrast and modelled these resonances with rate equations. However, the model was not used to predict the shape of the resonances.…”

Ultraslow long-living plasmons with electromagnetically induced transparency

“…1]. We emphasize that such EIT scenario has been demonstrated experimentally for sodium vapours at room temperatures [19].…”

“…1). In the situation when the Λ system is constituted by two hyperfine-splitted metastable states b and c, the Dopplerbroadening has no adverse effect on EIT even at room temperatures, provided that one uses co-propagating probe and control beams [5,12,19]. The role of the control beam is solely to modify the optical properties of the EIT medium, i.e.…”

Sensitive magnetometers based on dark states

“…Thus, the CPT resonances can be extremely narrow features allowing performances both at the level of basic physics experiments and of practical applications. Recently a complete suppression of fluorescence in narrow resonance has been realized exciting all ground-state Zeeman sublevels of sodium [3]. Different approaches have been adopted to observe CPT resonance.…”