Subnatural linewidth in a strongly-driven closed $F \rightarrow F'$ transitionSubnatural linewidth in a strongly-driven closed $F \rightarrow F'$ transition

Sapam Ranjita Chanu, Alok K. Singh, Boris Brun +2 more

We observe linewidths below the natural linewidth for a probe laser on a {\it two-level system}, when the same transition is driven by a strong control laser. We take advantage of the fact that each level is made of multiple magnetic sublevels, and use the phenomenon of electromagnetically induced transparency or absorption in multilevel systems. Optical pumping by the control laser redistributes the population so that only a few sublevels contribute to the probe absorption. We observe more than a factor of 3 reduction in linewidth in the $D_2$ line of Rb in room-temperature vapor. The observations can be understood from a density-matrix analysis of the sublevel structure.We observe linewidths below the natural linewidth for a probe laser on a {\it two-level system}, when the same transition is driven by a strong control laser. We take advantage of the fact that each level is made of multiple magnetic sublevels, and use the phenomenon of electromagnetically induced transparency or absorption in multilevel systems. Optical pumping by the control laser redistributes the population so that only a few sublevels contribute to the probe absorption. We observe more than a factor of 3 reduction in linewidth in the $D_2$ line of Rb in room-temperature vapor. The observations can be understood from a density-matrix analysis of the sublevel structure.

arXiv:1008.3231Aug 19, 20100 citations

Sub-natural linewidth and other coherent phenomena in driven multilevel systems

Lorenzo M. Narducci, Marlan O. Scully, Christoph H. Keitel +4 more

Jan 1, 19920 citations

Subnatural linewidth in large optical fields

Lorenzo M. Narducci, Christoph H. Keitel, Gian‐Luca Oppo +1 more

AIP conference proceedingsJan 1, 19951 citation

Subnatural linewidth averaging for coupled atomic and cavity-mode oscillators

H. J. Carmichael, Robert J. Brecha, Mark G. Raizen +2 more

We calculate the spontaneous-emission spectrum and the spectrum of weakly driven fluorescence for a two-level atom coupled to a resonant-cavity mode. For strong atom-cavity coupling the spectra split into two peaks that can have subnatural linewidths. If the cavity linewidth is negligible, the spontaneous-emission spectrum has half the radiative linewidth of the atom; the spectrum of weakly driven fluorescence shows an additional 36% squeezing-induced narrowing. These effects can be observed using coupled-field and collective-polarization oscillators excited in a cavity containing N two-level atoms.We calculate the spontaneous-emission spectrum and the spectrum of weakly driven fluorescence for a two-level atom coupled to a resonant-cavity mode. For strong atom-cavity coupling the spectra split into two peaks that can have subnatural linewidths. If the cavity linewidth is negligible, the spontaneous-emission spectrum has half the radiative linewidth of the atom; the spectrum of weakly driven fluorescence shows an additional 36% squeezing-induced narrowing. These effects can be observed using coupled-field and collective-polarization oscillators excited in a cavity containing N two-level atoms.

Physical Review ANov 1, 1989203 citations

Subnatural Linewidths in Atomic Spectroscopy

Dennis P. O'Brien, Pierre Meystre, HERBERT WALTHER

Advances in atomic and molecular physicsJan 1, 198524 citations

Subnatural linewidth in a strongly-driven closed

F \rightarrow F'

transition

D_2

line of Rb in room-temperature vapor. The observations can be understood from a density-matrix analysis of the sublevel structure.