Atomic self-ordering in a ring cavity with counterpropagating pump fields
Institut für Theoretische Physik, Universität Innsbruck - Technikerstraße 25, A-6020 Innsbruck, Austria
Received: 19 November 2014
Accepted: 12 February 2015
The collective dynamics of mobile scatterers and light in optical resonators generates complex behaviour. For strong transverse illumination a phase transition from homogeneous to crystalline particle order appears. In contrast, cold particles inside a single-side pumped ring cavity exhibit an instability towards bunching and collective acceleration called collective atomic recoil lasing (CARL). We demonstrate that by driving two orthogonally polarized counterpropagating modes of a ring resonator one realises both cases within one system. As a function of the two pump intensities the corresponding phase diagram exhibits regions in which either a generalized form of self-ordering towards a travelling density wave with constant centre-of-mass velocity or a CARL instability is formed. Time-dependent control of the cavity driving then allows to accelerate or slow down and trap a sufficiently dense beam of linearly polarizable particles.
PACS: 37.30.+i – Atoms, molecules, and ions in cavities / 67.85.-d – Ultracold gases, trapped gases
© EPLA, 2015