Preparation of individual magnetic sub-levels of 4He(23S1) in a supersonic beam using laser optical pumping and magnetic hexapole focusing.
Preparation of individual magnetic sub-levels of 4He(23S1) in a supersonic beam using laser optical pumping and magnetic hexapole focusing.
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DOI：
10.1063/5.0048323
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发表时间：
2021-06
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影响因子：
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通讯作者：
T. Sixt;Jiwen Guan;Alexandra Tsoukala;S. Hofsäss;Thilina Muthu-Arachchige;F. Stienkemeier;K. Dulitz
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文献类型：
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作者：
T. Sixt;Jiwen Guan;Alexandra Tsoukala;S. Hofsäss;Thilina Muthu-Arachchige;F. Stienkemeier;K. Dulitz
我们比较了两种不同的实验技术，即磁六极聚焦和激光光泵浦的磁亚能级制备亚稳态4 He在23 S1水平在超声束。在束流速度v = 830 m/s时，通过与粒子轨道模拟的比较，我们推断出在磁六极聚焦后，高达99%的亚稳原子处于MJ″ = +1亚能级.利用23 P2 - 23 S1跃迁的激光泵浦，对MJ″ = +1次能级的布居，我们获得了94% ± 3%的最大效率.首次证明了通过23 P1 - 23 S1跃迁的激光泵浦可以选择性地填充三个MJ″子能级（MJ″ =-1，0，+1）中的每一个。我们还发现，激光光泵浦导致更高的绝对原子数在特定的MJ″子能级比磁六极聚焦。
We compare two different experimental techniques for the magnetic-sub-level preparation of metastable 4He in the 23S1 level in a supersonic beam, namely, magnetic hexapole focusing and optical pumping by laser radiation. At a beam velocity of v = 830 m/s, we deduce from a comparison with a particle trajectory simulation that up to 99% of the metastable atoms are in the MJ″ = +1 sub-level after magnetic hexapole focusing. Using laser optical pumping via the 23P2-23S1 transition, we achieve a maximum efficiency of 94% ± 3% for the population of the MJ″ = +1 sub-level. For the first time, we show that laser optical pumping via the 23P1-23S1 transition can be used to selectively populate each of the three MJ″ sub-levels (MJ″ = -1, 0, +1). We also find that laser optical pumping leads to higher absolute atom numbers in specific MJ″ sub-levels than magnetic hexapole focusing.