Design and research of two-dimensional magneto-optical trap of sodium atom using permanent magnets

Li, Ziliang; Shi, Zhenlian; Wang, Pengjun

doi:10.7498/aps.69.20200266

Cited by 3 publications

(6 citation statements)

References 33 publications

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“…以形成高强度的冷原子束流 . 实验上会在 2D-MOT中加入推送光 [16,17] 或塞曼冷却光 [14,18] 来增强束流强度, 进而提高3D-MOT的装载率. 另外, 一些基于 2D-MOT其他构型包括 2D + -MOT [19] 、带双色推送光的 2D-MOT [20] 、边带增强型 2D-MOT [21] 、多边带2D-MOT [22] 也具有增强冷原子束流、提高装载率的作用.…”

Section: 纯2d-mot虽然可以对原子进行预冷却但是难unclassified

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Enhanced production of 199Hg cold atoms based on two-dimensional magneto-optical trap

Yu,

Liu,

Sun

et al. 2024

Acta Phys. Sin.

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Efficient preparation of cold atoms plays an important role in the precision measurement including optical lattice clocks (OLCs). Fast preparation of cold atoms reduces Dick noise by shortening dead time in a clock interrogation cycle, which improves the stability of OLCs. Here, we increase the loading rate of the three-dimensional magneto-optical trap (3D-MOT) in the ultra-high vacuum environment by utilizing the two-dimensional magneto-optical trap (2D-MOT) with a push beam, reduce the temperature of cold atoms with the compressing-MOT technique which is implemented by decreasing the detuning of 3D-MOT rapidly at the end of atom preparation, and realize the enhanced production of cold atoms for 199Hg OLCs. To achieve 3D-MOT and 2D-MOT of mercury atoms, a deep ultraviolet laser (DUVL) system composed of three DUVLs is developed with one working in lower power for frequency locking and the other two in high power for laser cooling. Such configuration improves the long-term frequency stability and shows greater robustness than our previous system consisting of two DUVLs. To maximize the 3D-MOT loading rate, we orderly optimize the detuning and the magnetic field gradient of 3D-MOT and those of 2D-MOT as well as the detuning and the power of the push beam. After the optimization of all parameters, we measure the maximum loading rate of 3D-MOT to be 3.1×105/s and prepare cold atoms of 1.8×106 in 9 s. The loading rate is greatly enhanced by a factor of 51 with 2D-MOT and the push beam. To improve the efficiency that cold atoms transfer from 3D-MOT to optical lattice, we use the compressing-MOT technique to reduce the temperature of cold atoms and produce cold 199Hg atoms of about 45 μK, below the temperature expected by Doppler cooling theory. By achieving the high gain of the 3D-MOT loading rate under the ultra-high vacuum and reducing the temperature of cold atoms, this enhanced preparation of cold atoms based on 2D-MOT effectively shortens the preparation time of cold atoms and improves the transfer efficiency of optical lattice, which provides a significant scheme for the efficient preparation of cold mercury atoms in other experiments.

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Section: 纯2d-mot虽然可以对原子进行预冷却但是难unclassified

“…如果将推送光的失谐量独立于2D-MOT的冷却光进行调谐, 可以进一步挖掘2D-MOT加推送光构型的增益潜力. 在之前的工作中 [17] , 我们将该方法用于 202 Hg冷原子团制备上, 并实现了8.4倍的增益. 高增益, 优于Bize研究组 [16] 的工作, 并在9 s内制备了个冷原子.…”

Section: 实现了unclassified

Enhanced production of 199Hg cold atoms based on two-dimensional magneto-optical trap

Yu,

Liu,

Sun

et al. 2024

Acta Phys. Sin.

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“…1(a), which has been used to create BEC of 23 Na. [35][36][37][38] The vacuum setup is composed of two parts connected through a differential pumping tube with internal diameter of 6 mm and length of 190 mm. The first part is for a two-dimensional (2D) magneto-optical trap (2D-MOT) which is devoted to the atomic source with a pre-cooling stage with a background pressure of 1 × 10 −7 Pa maintained by an ion pump with a pumping speed of 40 L/s.…”

Section: Experiments Setup 21 Vacuum Setupmentioning

confidence: 99%

“…The sodium laser system has been described in our previous works. [35][36][37] The laser frequencies for double dark threedimensional (3D) MOT of Na and K atoms and the gray molasses cooling of K atoms on D 1 line are shown in Fig. 3(a).…”

Section: Laser Setup Systemmentioning

confidence: 99%

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Quantum degenerate Bose-Fermi atomic gas mixture of ²³Na and ⁴⁰K

Li¹,

Gu²,

Shi³

et al. 2023

Chinese Phys. B

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We report a compact experimental setup for producing a quantum degenerate mixture of Bose $^{23}$Na and Fermi $^{40}$K gases. The atoms are collected in dual dark magneto-optical traps (MOT) with species timesharing loading to reduce the light-induced loss, and then further cooled using the gray molasses technique on the $D_{2}$ line for $^{23}$Na and $D_{1}$ line for $^{40}$K. The microwave evaporation cooling is used to cool $^{23}$Na in $| F=2,m_{F}=2\rangle$ in an optically plugged magnetic trap, meanwhile, $^{40}$K in $| F=9/2,m_{F}=9/2\rangle$ is sympathetic cooled. Then the mixture is loaded into a large volume optical dipole trap where $^{23}$Na atoms are immediately transferred to $|1,1\rangle$ for further effective cooling to avoid the strong three-body loss between $^{23}$Na atoms in $|2,2\rangle$ and $^{40}$K atoms in $|9/2,9/2\rangle$. At the end of the evaporation in optical trap, a degenerate Fermi gas of $^{40}$K with 1.9$\times10^{5}$ atoms at $T/T_{F}$=0.5 in the $|9/2,9/2\rangle$ hyperfine state coexists with a Bose-Einstein condensate (BEC) of $^{23}$Na with 8$\times10^{4}$ atoms in the $|1,1\rangle$ hyperfine state at 300 nK. We also can produce the two species mixture with the tunable population imbalance by adjusting the $^{23}$Na magneto-optical trap loading time.

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Production of ²³Na Bose–Einstein condensates in the F = 2 state using D₂ gray molasses

Shi

Wang

et al. 2021

J. Opt. Soc. Am. B

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We report on the production of Bose–Einstein condensates of sodium atoms in the hyperfine state | F = 2 , m F = 2 ⟩ in a crossed optical dipole trap using D 2 gray molasses. We use the gray molasses sub-Doppler cooling technique to obtain an atomic sample of 3 × 10 8 at 56 µK. After the radio frequency (RF) evaporation cooling in an optically plugged magnetic trap, we transfer the atoms sample of 2.5 × 10 6 at 5.7 µK to a crossed optical dipole trap where a pure condensate with an atom number of 2 × 10 5 and lifetime of 6.3 s is obtained by further evaporation. We compare the cooling process of sodium atoms in the | 2 , 2 ⟩ and the | 1 , 1 ⟩ states by evaporation in the optical trap, and also observe the different three-body loss rates by the lifetime measurement.

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Design and research of two-dimensional magneto-optical trap of sodium atom using permanent magnets

Cited by 3 publications

References 33 publications

Enhanced production of <sup>199</sup>Hg cold atoms based on two-dimensional magneto-optical trap

Enhanced production of <sup>199</sup>Hg cold atoms based on two-dimensional magneto-optical trap

Quantum degenerate Bose-Fermi atomic gas mixture of ²³Na and ⁴⁰K

Production of ²³Na Bose–Einstein condensates in the F = 2 state using D₂ gray molasses

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Design and research of two-dimensional magneto-optical trap of sodium atom using permanent magnets

Cited by 3 publications

References 33 publications

Enhanced production of <sup>199</sup>Hg cold atoms based on two-dimensional magneto-optical trap

Enhanced production of <sup>199</sup>Hg cold atoms based on two-dimensional magneto-optical trap

Quantum degenerate Bose-Fermi atomic gas mixture of 23Na and 40K

Production of 23Na Bose–Einstein condensates in the F = 2 state using D2 gray molasses

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Product

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Quantum degenerate Bose-Fermi atomic gas mixture of ²³Na and ⁴⁰K

Production of ²³Na Bose–Einstein condensates in the F = 2 state using D₂ gray molasses