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Applied Physics B

Trapping and storage of atoms in a laser field

V. S. Letkhov, Vladimir G. Minogin

Published Sep 1, 1978• 30 citations
Publisher
DOI
10.1007/bf00885037

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Analysis of the possiblity of cooling, trapping, and storage of atoms in the resonant field of a laser standing wave is presented. Under certain regimes of frequency scanning the laser radiation can cool atoms in low-pressure gas to the temperature T ≃ 10−4−10−3 K. Because of gradient force effects, cooled atoms will be held in the light field for a long time. Joint cooling and storage of atoms in a resonant light field is important for spectroscopic studies with an extremely high sensitivity and resolution.
We systematically studied the storage time of Rb87 atoms in an optical dipole trap (ODT) formed by a multimode fiber laser. Storage time is an important parameter in cold atom experiments. If atoms are prepared in the hyperfine state |F=2〉, hyperfine-state-changing collisions can transfer these atoms from |F=2〉 to |F=1〉, whereby the released kinetic energy leads to considerable trap loss. In most ODT experiments, atoms are prepared in the hyperfine state |F=1〉. However, two-photon Raman transitions induced by high-power multimode fiber lasers can optically pump these atoms from |F=1〉 to |F=2〉, and the following hyperfine-state-changing collision results in the trap loss. In this work, our experimental data indicate that both the two-photon Raman transition and the hyperfine-state-changing collision can be inhibited if the atoms are prepared in the single Zeeman sublevel of |F=2,m=2〉 (or |F=2,m=−2〉) and an auxiliary magnetic field is applied.