Enhanced spontaneous emission into the mode of a cavity QED system

Abstract

We study the light generated by spontaneous emission into a mode of a cavity QED system under weak excitation of the orthogonally polarized mode. Operating in the intermediate regime of cavity QED with comparable coherent and decoherent coupling constants, we find an enhancement of the emission into the undriven cavity mode by more than a factor of 18.5 over that expected by the solid angle subtended by the mode. A model that incorporates three atomic levels and two polarization modes quantitatively explains the observations.

Intensity auto- and cross correlations for a three-level Λ-type atom in a driven, damped two-mode cavity

“…The steady-state cavity field intensities, conditioned on no emissions from the undriven mode, for a three-level Λ atom in a two-mode cavity were reported in [6]. We extend the results of that paper to calculate normalized second-order intensity auto-and cross correlations for weak driving by numerically solving the Schrödinger equation to account for the relaxation of the system back to steady state following a spontaneous emission from the atom or leakage from either cavity mode.…”

“…Typical quantities of interest are photon statistics and nonclassical correlations [1][2][3] and production and transfer of entanglement [4,5]. A single atom three-level atom cavity model has been used to demonstrate enhancement of spontaneous emission into an undriven cavity mode [6]. Other recent work has focused on systems that make use of multilevel atomic structure to couple atoms to multiple cavity modes [7][8][9][10][11].…”

Probe spectrum of multilevel atoms in a damped, weakly driven two-mode cavity

“…[2] that the three-level model for N atoms in a weakly driven cavity correctly predicts the intensity of the undriven mode as a function of the cooperativity parameter C = Ng 2 /(κγ ) when the cavity is driven on resonance.…”

“…Recently the two-level model has been extended to account for multiple hyperfine levels [1]. Recent cavity QED experiments have explicitly made use of the multilevel structure of Rb to allow coupling of the atoms with two degenerate orthogonally polarized cavity modes with one mode driven by a laser and coupling the m F = 0 atomic transitions and the other collecting atomic fluorescence on the m F = ±1 transitions [2][3][4][5]. A three-level atomic model has been used to successfully explain the transmitted intensities in both the driven and undriven modes [2] when the driving laser is on resonance with the cavity mode and the atomic transition.…”

“…We model a system similar to that described in [2] in which 85 Rb atoms are loaded into a magneto-optical trap (MOT) and the pushed into an optical microcavity near the MOT. The cavity is driven through one of the end mirrors with a horizontally polarized laser tuned near resonance with the F = 3 to F = 4 transition on the D 2 line with the polarization aligned parallel to an applied magnetic field.…”