Sub-Doppler Laser Cooling of Thulium Atoms in a Magneto-optical Trap

Details Sub-Doppler Laser Cooling of Thulium Atoms in a Magneto-optical Trap Sub-Doppler Laser Cooling of Thulium Atoms in a Magneto-optical Trap

2010-12-24

arxiv.org/abs/1012.5433v1

Journal of Experimental and Theoretical Physics Letters, 2010, 92:10, 703--706

Physics

Quantum Physics

4 pages, 4 figures

Scientific paper

We have experimentally studied sub-Doppler laser cooling in a magneto-optical trap for thulium atoms working at the wavelength of 410.6\,nm. Without any dedicated molasses period of sub-Doppler cooling, the cloud of $3\times 10^6$ atoms at the temperature of 25(5)\,$\mu$K was observed. The measured temperature is significantly lower than the Doppler limit of 240$\mu$K for the cooling transition at 410.6\,nm. High efficiency of the sub-Doppler cooling process is due to a near-degeneracy of the Land\'e-$g$ factors of the lower $4f^{13}6s^{2}\, (J\,=\,{7}/{2})$ and the upper $4f^{12}5d_{3/2}6s^{2}\, (J\,=\,{9}/{2})$ cooling levels.}

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