Sub-Doppler resolution in inhomogeneously broadened media using intense control fields

Abstract

We propose a scheme for obtaining sub-Doppler resolution for one transition of an inhomogeneously broadened, three-level atomic system, by using an intense control field at the other transition. Analytical and numerical calculations are presented to delineate the mechanism responsible for this sub-Doppler resolution, and quantify the extent to which Doppler broadening can be reduced.

Observation of sub-Doppler absorption in the ?-type three-level Doppler-broadened cesium system

“…Using the theoretical results of ref [9] based on the Λ-type three-level model a simulation for our case is …”

“…The absorption of the probe laser versus the coupling detuning in this kind of Λ-type three-level system has been theoretically investigated by G. Vemuri et al [9]. The absorption characters are modified by the atomic coherence induced by a coupling laser.…”

“…Is there any other way to obtain sub-Doppler resolution absorption? G. Vemuri et al [9] theoretically demonstrated the possibility of realizing sub-Doppler resolution in the Ladder-type or Λ-type three-level Doppler-broadened atomic system via the atomic coherence induced by a coupling laser, where the atomic coherence is used to influence inhomogeneous broadening. Following the above theoretical work ref [10] and [11] reported the experimental results performed in rubidium vapor cell.…”

Subnatural linewidth in room-temperature Rb vapor using a control laser

“…The absorption of the weak probe in the Λ system has been derived previously [4]. As is well known, the control laser splits the upper level into two dressed states due to the ac Stark shift.…”

“…The control laser creates two dressed states [3] and the probe absorption splits into an Autler-Townes doublet. The key idea is that, when the control laser is detuned from resonance, the two dressed states have asymmetric linewidths, such that their sum is the unperturbed linewidth [4,5]. This asymmetry persists even when the peaks are inhomogeneously broadened.…”