An atom moving in a near resonant laser field with its dipole strongly coupled to a resonator field mode was analyzed. A substantially different and counterintuitive linear velocity dependence of the light scattering properties was found, as compared to the standard Doppler shift. It was shown that the mechanical force of the laser field exhibited strong velocity selectivity at a polariton resonance, which gives rise to an enhanced friction force and Doppler cooling. The results show that this effect allows for sub-Doppler cooling of atoms even with a nondegenerate ground state.
ASJC Scopus subject areas
- Physics and Astronomy(all)