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Progress in Crystal Growth and Characterization of Materials

Spectroscopic properties of cold rubidium atoms in a magneto-optic trap

Yoshio Torii, Noritsugu Shiokawa, Yukari Matsuo, Takuya Hirano, Takahiro Kuga

Published Jan 1, 1996• 1 citation
Publisher
DOI
10.1016/0960-8974(96)83682-5

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Spectral characteristics of rubidium atoms confined in a dark magneto-optical trap (DMOT) are measured, including probe absorption spectra and atom density as a function of the cooling and repumping laser frequencies. The trap can capture and cool more than 2.5 × 10 8 rubidium atoms, confining them in a hyperfine state weakly perturbed by the laser beams used to form the trap. The optical density of the trapped atomic cloud approaches 9. A qualitative model of the DMOT operation is presented, based on the experimental results obtained.
The lifetimes of rubidium atoms in a dark magneto-optical trap are measured at different populations of the 'bright' and 'dark' hyperfine states of captured atoms. It is found that the lifetime of atoms in the trap decreases if they spend more time in the bright state. A simple explanation of this effect is proposed which is based on the increase in the transport cross section for collisions of thermal rubidium atoms surrounding the trap with cold rubidium atoms upon their electronic excitation.