COLLECTIVE LASER COOLING OF 2 TRAPPED IONS

Collective laser cooling of two ions moving in a trapping potential is studied theoretically in the limit when the distance between the ions is smaller or comparable to the wavelength of the exciting laser ligh t. A set of rate equations for the population of the trap levels is de rived in the Lamb-Dicke limit, and for low laser intensities describin g the effects of dipole-dipole interaction and super- and subradiance on the cooling dynamics.