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Characterization of cold atoms based on photoionization momentum spectra.

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Title: Characterization of cold atoms based on photoionization momentum spectra.
Authors: Wu, Zhixian1 (AUTHOR), Ruan, Shushu2 (AUTHOR), Shen, Zhenjie1 (AUTHOR) shenzhj2@shanghaitech.edu.cn, Liu, Jie2 (AUTHOR), Yu, Xinglong2 (AUTHOR), Chen, Lifeng1 (AUTHOR), Zhu, Bing3 (AUTHOR), Wang, Xincheng1 (AUTHOR), Jiang, Yuhai1,2,4 (AUTHOR) jiangyh3@shanghaitech.edu.cn
Source: Chinese Physics B. Jul2025, Vol. 34 Issue 7, p1-6. 6p.
Subjects: Multiphoton ionization, Infrared lasers, Momentum distributions, Magnetic traps, Magnetic fields, Femtosecond lasers
Abstract: We propose a method to characterize the features of a cold strontium cloud in a magneto-optical trap (MOT) through the photoionization of cold Sr atoms in a custom-designed reaction microscope. Sr atoms in the dark state of 5s5p3P2 populated via the cascade transition 5s5p1P1 → 5s4d1D2 → 5s5p3P2 accumulate a significant fraction, giving a long lifetime of 520 s. These atoms in the dark state are subsequently trapped by the gradient magnetic field of the MOT. By scanning the Sr+ momentum distributions ionized with an 800 nm infrared femtosecond laser, we are able to outline the size of ∼0.55 mm in radius and the temperature of ∼0.40 mK for the dark-state atoms, which is significantly cooler than the MOT temperature of 3.3 mK trapped in the 461 nm. The size of MOT exhibits an oblate spheroidal distribution with a radius of approximately 0.35 mm and 0.55 mm, extracted with momenta of photoion and absorption imaging, respectively. The results using the photoion momenta are consistent with the expected results from absorption imaging, which confirms the method's reliability. The advantage of this method is the ability to simultaneously characterize the distribution information of atoms in different initial states within the cold atomic cloud. [ABSTRACT FROM AUTHOR]
Copyright of Chinese Physics B is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 186717025
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Characterization of cold atoms based on photoionization momentum spectra.
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  Data: <searchLink fieldCode="AR" term="%22Wu%2C+Zhixian%22">Wu, Zhixian</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ruan%2C+Shushu%22">Ruan, Shushu</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Shen%2C+Zhenjie%22">Shen, Zhenjie</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> shenzhj2@shanghaitech.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Liu%2C+Jie%22">Liu, Jie</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yu%2C+Xinglong%22">Yu, Xinglong</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chen%2C+Lifeng%22">Chen, Lifeng</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhu%2C+Bing%22">Zhu, Bing</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Xincheng%22">Wang, Xincheng</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jiang%2C+Yuhai%22">Jiang, Yuhai</searchLink><relatesTo>1,2,4</relatesTo> (AUTHOR)<i> jiangyh3@shanghaitech.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22Chinese+Physics+B%22">Chinese Physics B</searchLink>. Jul2025, Vol. 34 Issue 7, p1-6. 6p.
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  Data: <searchLink fieldCode="DE" term="%22Multiphoton+ionization%22">Multiphoton ionization</searchLink><br /><searchLink fieldCode="DE" term="%22Infrared+lasers%22">Infrared lasers</searchLink><br /><searchLink fieldCode="DE" term="%22Momentum+distributions%22">Momentum distributions</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+traps%22">Magnetic traps</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+fields%22">Magnetic fields</searchLink><br /><searchLink fieldCode="DE" term="%22Femtosecond+lasers%22">Femtosecond lasers</searchLink>
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  Label: Abstract
  Group: Ab
  Data: We propose a method to characterize the features of a cold strontium cloud in a magneto-optical trap (MOT) through the photoionization of cold Sr atoms in a custom-designed reaction microscope. Sr atoms in the dark state of 5s5p3P2 populated via the cascade transition 5s5p1P1 → 5s4d1D2 → 5s5p3P2 accumulate a significant fraction, giving a long lifetime of 520 s. These atoms in the dark state are subsequently trapped by the gradient magnetic field of the MOT. By scanning the Sr+ momentum distributions ionized with an 800 nm infrared femtosecond laser, we are able to outline the size of ∼0.55 mm in radius and the temperature of ∼0.40 mK for the dark-state atoms, which is significantly cooler than the MOT temperature of 3.3 mK trapped in the 461 nm. The size of MOT exhibits an oblate spheroidal distribution with a radius of approximately 0.35 mm and 0.55 mm, extracted with momenta of photoion and absorption imaging, respectively. The results using the photoion momenta are consistent with the expected results from absorption imaging, which confirms the method's reliability. The advantage of this method is the ability to simultaneously characterize the distribution information of atoms in different initial states within the cold atomic cloud. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Chinese Physics B is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1088/1674-1056/add00d
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      – Code: eng
        Text: English
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        PageCount: 6
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      – SubjectFull: Multiphoton ionization
        Type: general
      – SubjectFull: Infrared lasers
        Type: general
      – SubjectFull: Momentum distributions
        Type: general
      – SubjectFull: Magnetic traps
        Type: general
      – SubjectFull: Magnetic fields
        Type: general
      – SubjectFull: Femtosecond lasers
        Type: general
    Titles:
      – TitleFull: Characterization of cold atoms based on photoionization momentum spectra.
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            NameFull: Wu, Zhixian
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            NameFull: Ruan, Shushu
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            – D: 01
              M: 07
              Text: Jul2025
              Type: published
              Y: 2025
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