Accurate Calculation of the Height of Cold Atoms Throw-Up

LIU Kun; SONG Wenxia; YUAN Xiaodi; CHEN Weiliang; DAI Shaoyang; FANG Fang; LI Tianchu

doi:10.12338/j.issn.2096-9015.2020.9029

Volume 65 Issue 10

Oct. 2021

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LIU Kun, SONG Wenxia, YUAN Xiaodi, CHEN Weiliang, DAI Shaoyang, FANG Fang, LI Tianchu. Accurate Calculation of the Height of Cold Atoms Throw-Up[J]. Metrology Science and Technology, 2021, 65(10): 3-5. doi: 10.12338/j.issn.2096-9015.2020.9029

Citation:

LIU Kun, SONG Wenxia, YUAN Xiaodi, CHEN Weiliang, DAI Shaoyang, FANG Fang, LI Tianchu. Accurate Calculation of the Height of Cold Atoms Throw-Up[J]. Metrology Science and Technology, 2021, 65(10): 3-5. doi: 10.12338/j.issn.2096-9015.2020.9029

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Accurate Calculation of the Height of Cold Atoms Throw-Up

doi: 10.12338/j.issn.2096-9015.2020.9029

National Institute of Metrology, Beijing 100029, China

Available Online: 2021-07-30
Publish Date: 2021-10-18

Abstract

Abstract

After the laser trapping and cooling, the cold atoms in a cesium fountain clock undergo a short period of upward acceleration and uniform motion due to the frequency detuning of the upward and the downward lasers. Then, with the cooling laser shut down, the cold atoms keep going up to the apex under the gravity and then fall down to the detection area to be detected by the detection laser. The height of cold atoms throw-up is the distance from the MOT center to the apex. Previous calculations ignored the acceleration and uniform upward movement of the cold atoms, resulting in a systematic error. This paper corrects for the error by considering three different movement processes of the cold atoms and accurately calculates the height of the cold atoms throw-up from the experimental data of the time-of-flight signal.
- cold atoms,
- fountain clock,
- height of throw-up,
- time-of-flight signal,
- accurate calculation

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References(12)

References

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