Cooling induced by parametric resonance in a magnetic quadrupole trap
Cooling induced by parametric resonance in a magnetic quadrupole trap
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DOI：
10.3788/col20080602.0087
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发表时间：
2008-02
影响因子：
3.5
通讯作者：
Pengfei Zhang;Haichao Zhang;Xinping Xu;Yu-zhu Wang
中科院分区：
文献类型：
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作者：
Pengfei Zhang;Haichao Zhang;Xinping Xu;Yu-zhu Wang
实验证明，通过各向异性地调制阱势，可以利用四极阱的非简谐特性来冷却被囚禁原子。这种冷却效应来自于能量选择性地去除最具能量的被困原子和剩余原子的热平衡。研究了调制后阱中剩余原子的分数和温度随频率的变化关系。研究还表明，参量共振引起的冷却也可以增加囚禁原子的相空间密度。
It is demonstrated experimentally that the anharmonic property of the quadrupole trap can be exploited to cool trapped atoms by modulating the trap potential anisotropically. This cooling effect arises from the energy-selective removal of the most energetic trapped atoms and the thermal equilibrium of the remaining atoms. The frequency dependences of the temperature and the fraction of the atoms left in the trap after the modulation are explored. It is also demonstrated that the cooling induced by parametric resonance can also increase the phase space density of the trapped atoms.