Spectroscopy and isotope shifts of the 4s3d 1D2–4s5p 1P1 repumping transition in magneto-optically trapped calcium atoms
Spectroscopy and isotope shifts of the 4s3d 1D2–4s5p 1P1 repumping transition in magneto-optically trapped calcium atoms
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DOI：
10.1103/physreva.81.023424
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发表时间：
2010-02
影响因子：
2.9
通讯作者：
U. Dammalapati;I. Norris;C. Burrows;A. Arnold;E. Riis
中科院分区：
文献类型：
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作者：
U. Dammalapati;I. Norris;C. Burrows;A. Arnold;E. Riis
我们研究了磁光俘获钙原子的再泵浦方案。它是基于扩展腔半导体激光器在672 nm处激发4s3d1D2-4s5p1P1跃迁的。再泵浦的影响大约是由塞曼慢化热束引起的陷阱寿命增加三倍和俘获效率翻倍。此外，672 nm的激光将原子从原本黑暗的状态重新泵浦，从而使磁光陷阱(MOT)探测到的荧光信号总体上增加了一个数量级以上。此外，我们首次报道了四种自然产生的偶数同位素的672 nm跃迁的同位素位移测量。利用现有的电荷半径数据，观测到的高达4.3 GHz的位移在King图分析中显示出预期的线性相关性。测量的位移被用来确定其余41，43，46Ca同位素的同位素位移。在使用丰度较低的同位素能够选择性地重新抽运同位素，从而提高捕获和探测效率的情况下，这可能是有意义的。
We investigate a repumping scheme for magneto-optically trapped calcium atoms. It is based on excitation of the 4s3d1D2-4s5p1P1 transition at 672 nm with an extended cavity diode laser. The effect of the repumping is approximately a factor of three increase in trap lifetime and a doubling of the trapping efficiency from a Zeeman slowed thermal beam. Added to this, the 672-nm laser repumps atoms from an otherwise dark state to yield an overall increase in detected fluorescence signal from the magneto-optic trap (MOT) of more than an order of magnitude. Furthermore, we report isotope shift measurements of the 672-nm transition, for the first time, for four naturally occurring even isotopes. Using available charge radii data, the observed shifts, extending up to 4.3 GHz, display the expected linear dependence in a King plot analysis. The measured shifts are used to determine the isotope shifts of the remaining 41,43,46Ca isotopes. These might be of interest where less abundant isotopes are used enabling isotope selective repumping, resulting in enhanced trapping and detection efficiencies.