Quantum correlations in laser-driven superradiant atomic clouds and arrays of Dy atoms for light scattering

Collective interaction of light with an atomic gas can give rise to superradiant instabilities. We experimentally study the sudden build-up of a reverse light field in a laser-driven high-finesse ring cavity filled with ultracold thermal or condensed atoms. While superradiant Rayleigh scattering from atomic clouds is normally only observed at very low temperatures (i.e. well below $1 μ$ K), the presence of the ring cavity enhances cooperativity and allows for superradiance with thermal clouds as hot as several $10 μ$ K. A characterization of the superradiance at various temperatures and cooperativity parameters allows us to link it to the collective atomic recoil laser.Collective interaction of light with an atomic gas can give rise to superradiant instabilities. We experimentally study the sudden build-up of a reverse light field in a laser-driven high-finesse ring cavity filled with ultracold thermal or condensed atoms. While superradiant Rayleigh scattering from atomic clouds is normally only observed at very low temperatures (i.e. well below $1 μ$K), the presence of the ring cavity enhances cooperativity and allows for superradiance with thermal clouds as hot as several $10 μ$K. A characterization of the superradiance at various temperatures and cooperativity parameters allows us to link it to the collective atomic recoil laser.

arXiv:quant-ph/0610213Oct 25, 20061 citation

Superradiant Rayleigh Scattering and Collective Atomic Recoil Lasing in a Ring Cavity

Sebastian Slama, Simone Bux, Gordon Krenz +2 more

Collective interaction of light with an atomic gas can give rise to superradiant instabilities. We experimentally study the sudden buildup of a reverse light field in a laser-driven high-finesse ring cavity filled with ultracold thermal or Bose-Einstein condensed atoms. While superradiant Rayleigh scattering from atomic clouds is normally observed only at very low temperatures (i.e., well below 1 microK), the presence of the ring cavity enhances cooperativity and allows for superradiance with thermal clouds as hot as several 10 microK. A characterization of the superradiance at various temperatures and cooperativity parameters allows us to link it to the collective atomic recoil laser.Collective interaction of light with an atomic gas can give rise to superradiant instabilities. We experimentally study the sudden buildup of a reverse light field in a laser-driven high-finesse ring cavity filled with ultracold thermal or Bose-Einstein condensed atoms. While superradiant Rayleigh scattering from atomic clouds is normally observed only at very low temperatures (i.e., well below 1 microK), the presence of the ring cavity enhances cooperativity and allows for superradiance with thermal clouds as hot as several 10 microK. A characterization of the superradiance at various temperatures and cooperativity parameters allows us to link it to the collective atomic recoil laser.

Physical Review LettersFeb 1, 2007245 citations

Atomic correlations in a laser

L. A. Pokrovskii, Alexander M. Khazanov

Theoretical and Mathematical PhysicsJan 1, 19823 citations

Quantum statistics of a superradiant laser

R. Bonifacio, M. Gronchi

Il Nuovo cimento della Società italiana di fisica. B/Il Nuovo cimento BMar 1, 19724 citations

Cooperativity in light scattering by cold atoms

Tom Bienaimé, Romain Bachelard, N. Piovella +1 more

Abstract A cloud of cold N two‐level atoms driven by a resonant laser beam shows cooperative effects both in the scattered radiation field and in the radiation pressure force acting on the cloud center‐of‐mass. The induced dipoles synchronize and the scattered light presents superradiant and/or subradiant features. We present a quantum description of the process in terms of a master equation for the atomic density matrix in the scalar, Born‐Markov approximations, reduced to the single‐excitation limit. From a perturbative approach for weak incident field, we derive from the master equation the effective Hamiltonian, valid in the linear regime. We discuss the validity of the driven timed Dicke ansatz and of a partial wave expansion for different optical thicknesses and we give analytical expressions for the scattered intensity and the radiation pressure force on the center of mass. We also derive an expression for collective suppression of the atomic excitation and the scattered light by these correlated dipoles.Abstract A cloud of cold N two‐level atoms driven by a resonant laser beam shows cooperative effects both in the scattered radiation field and in the radiation pressure force acting on the cloud center‐of‐mass. The induced dipoles synchronize and the scattered light presents superradiant and/or subradiant features. We present a quantum description of the process in terms of a master equation for the atomic density matrix in the scalar, Born‐Markov approximations, reduced to the single‐excitation limit. From a perturbative approach for weak incident field, we derive from the master equation the effective Hamiltonian, valid in the linear regime. We discuss the validity of the driven timed Dicke ansatz and of a partial wave expansion for different optical thicknesses and we give analytical expressions for the scattered intensity and the radiation pressure force on the center of mass. We also derive an expression for collective suppression of the atomic excitation and the scattered light by these correlated dipoles.

arXiv:1204.5598Fortschritte der PhysikJun 18, 2012104 citations

1 μ

K), the presence of the ring cavity enhances cooperativity and allows for superradiance with thermal clouds as hot as several

10 μ

K. A characterization of the superradiance at various temperatures and cooperativity parameters allows us to link it to the collective atomic recoil laser.