We report experimental demonstration of a magneto-optical trap （MOT） of Rb atoms with a high optical density. With 2.2-cm-diameter cooling laser beams, we achieve an optical density of nearly 11 for about 2.6× ...We report experimental demonstration of a magneto-optical trap （MOT） of Rb atoms with a high optical density. With 2.2-cm-diameter cooling laser beams, we achieve an optical density of nearly 11 for about 2.6× 10^10 trapped Rb atoms with the beam intensity of about 6.6 mW/cm^2 per beam. The temperature of the cold atoms is about 250 μK. Furthermore, by ramping the magnetic field gradient from 8 G/cm to about 20 G/cm, the atomic cloud in the MOT is compressed and the optical density is up to 16.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 60578059, 10874106, 10640420195 and 60821004, the National Basic Research Programme of China under Grant No 2006CB921103, and the Natural Science Foundation of Shanxi Province under Grant No 2007011004.
文摘We report experimental demonstration of a magneto-optical trap （MOT） of Rb atoms with a high optical density. With 2.2-cm-diameter cooling laser beams, we achieve an optical density of nearly 11 for about 2.6× 10^10 trapped Rb atoms with the beam intensity of about 6.6 mW/cm^2 per beam. The temperature of the cold atoms is about 250 μK. Furthermore, by ramping the magnetic field gradient from 8 G/cm to about 20 G/cm, the atomic cloud in the MOT is compressed and the optical density is up to 16.
