An optical lattice with rubidium atoms ( 85 Rb) is formed inside a ring resonator with a finesse of 1.8 × 10 5 and a large mode volume of 1.3 mm 3 . We typically trap several times 10 6 atoms at densities up to 10 12 cm −3 and temperatures between 25 and 125 µK. Despite of the narrow bandwidth (17.3 kHz) of the cavity, heating due to intra-cavity intensity fluctuations is kept at a low level, such that the time evolution of the temperature is determined by evaporative cooling.

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