Laser Cooling of 87Rb to 1.5µK in a Fountain Clock
WANG Bin1, LÜ De-Sheng1**, QU Qiu-Zhi1, ZHAO Jian-Bo1, LI Tang1, LIU Liang1,2**, WANG Yu-Zhu1
1Key Laboratory of Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800 2State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062
Laser Cooling of 87Rb to 1.5µK in a Fountain Clock
WANG Bin1, LÜ De-Sheng1**, QU Qiu-Zhi1, ZHAO Jian-Bo1, LI Tang1, LIU Liang1,2**, WANG Yu-Zhu1
1Key Laboratory of Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800 2State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062
摘要We report an experiment on the adiabatic cooling of 87Rb atoms in an atomic fountain to a temperature as low as 1.5 μK, which is roughly twice the recoil temperature. The atomic fountain has the (1,1,1) optical geometry for cooling and launching of cold atoms. The atoms are first cooled in an optical molasses of 6 beams to 3.4 μK by polarization gradient geometry and then are adiabatically cooled by decreasing the intensity of laser from 1.8Is per beam to zero in 1 ms during the launching of cold atoms. We also study the dependences of atomic temperature on different laser parameters. The method we used is useful in any cold atom physics experiment.
Abstract：We report an experiment on the adiabatic cooling of 87Rb atoms in an atomic fountain to a temperature as low as 1.5 μK, which is roughly twice the recoil temperature. The atomic fountain has the (1,1,1) optical geometry for cooling and launching of cold atoms. The atoms are first cooled in an optical molasses of 6 beams to 3.4 μK by polarization gradient geometry and then are adiabatically cooled by decreasing the intensity of laser from 1.8Is per beam to zero in 1 ms during the launching of cold atoms. We also study the dependences of atomic temperature on different laser parameters. The method we used is useful in any cold atom physics experiment.
WANG Bin;LÜDe-Sheng**;QU Qiu-Zhi;ZHAO Jian-Bo;LI Tang;LIU Liang;**;WANG Yu-Zhu
. Laser Cooling of 87Rb to 1.5µK in a Fountain Clock[J]. 中国物理快报, 2011, 28(6): 63701-063701.
WANG Bin, LÜ, De-Sheng**, QU Qiu-Zhi, ZHAO Jian-Bo, LI Tang, LIU Liang, **, WANG Yu-Zhu
. Laser Cooling of 87Rb to 1.5µK in a Fountain Clock. Chin. Phys. Lett., 2011, 28(6): 63701-063701.
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