Comparison of different techniques in optical trap for generating picokelvin 3D atom cloud in microgravity

Yao, Hepeng; Luan, Tian; Li, Chen; Zhang, Y.; Ma, Zihan; Chen, Xuzong

doi:10.1016/j.optcom.2015.09.065

Cited by 9 publications

(14 citation statements)

References 26 publications

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“…Of course, with such a large scattering length, the condensate is very unstable. Numerical studies show that the Two Stage Crossed Beam Cooling (TSC) method can be used to cool the 87 Rb atomic system to an ultra-low temperature of 7pK in an ideal microgravity environment 16 . The effectiveness of the TSC method is also experimentally confirmed on the ground with the magnetic levitation method 17 .…”

Section: B Results Of Psd Increment By Magnetic Tuningmentioning

confidence: 99%

Numerical study of evaporative cooling in the space station

Fan

Zhao

Zhang

et al. 2020

J. Phys. B: At. Mol. Opt. Phys.

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In this paper, we numerically studied the effects of mechanical vibration and magnetic fields on evaporative cooling process carried in space station by direct simulation Monte Carlo method. Simulated with the vibration data of international space station, we found that the cooling process would suffer great atomic losses until the accelerations reduced tenfold at least. In addition, if we enlarge the s-wave scattering length five times by feshbach resonance, the phase space density increased to 50 compared to 3 of no magnetic fields situation after 5 s evaporative cooling. We also simulated the two stages crossed beam evaporative cooling process under both physical impacts and obtain 4 × 105 85Rb atoms with a temperature of 8 pK. These results are of significance to the cold atom experiments carried out on space station in the future.

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Section: B Results Of Psd Increment By Magnetic Tuningmentioning

confidence: 99%

Numerical study of evaporative cooling in the space station

Fan

Zhao

Zhang

et al. 2020

J. Phys. B: At. Mol. Opt. Phys.

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“…The useful cooling time is limited by inelastic collisions. To reach temperatures in the picokelvin regime within an acceptable time, the CAPR (Cold Atom Physics Rack) system intended for the Chinese Space Station (expected to be launched in 2022) has adopted an all-optical trap with the TSC scheme，which was proposed by Peking University team [57][58][59][60] in 2013. In the first stage of this technique, two crossed laser beams with a narrow waist and high power are used to form an optical trap for runaway evaporation cooling.…”

Section: Two-stage Cooling In An All-optical Trapmentioning

confidence: 99%

“…The following is a description of the theory of the Peking University team and the related ground experiments. The literature [57][58][59][60] describes the basic principle and process of TSC to reduce the temperature of Rb and K atoms to the picokelvin region. In testing the TSC scheme, two mutually perpendicular intersecting beams were used ( Fig.…”

Section: Two-stage Cooling In An All-optical Trapmentioning

confidence: 99%

“…For the TSC process, the shallow and wide laser beam cannot withstand a significant gravitational acceleration, resulting in a substantial number of atoms scattered in the direction of gravity (z direction). This process will lead to a decrease in the number of atoms and the density of phase space, so that the cooling cannot proceed normally, and the average temperature of the system is increased [59].…”

Section: Two-stage Cooling In An All-optical Trapmentioning

confidence: 99%

“…In 2018, Peking University demonstrated a scheme based on all-optical dipole traps, referred to as two-stage cooling (TSC) [57][58][59][60]. The TSC scheme was proposed in 2013 and is planned to be implemented on the Chinese Space Station (expected to launch in 2022), with the target temperature of below 100 pK.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The emergence of picokelvin physics

Chen

Fan

2020

Rep. Prog. Phys.

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The frontier of low-temperature physics has advanced to the mid pico-Kelvin (pK) regime but progress has come to a halt because of the problem of gravity. Ultra cold atoms must be confined in some type of potential energy well: if the depth of the well is less than the energy an atom gains by falling through it, the atom escapes. This article reviews ultra cold atom research, emphasizing the advances that carried the low temperature frontier to 450 pico-Kelvin. We review micro gravity methods for overcoming the gravitation limit to achieve further low temperature using free fall techniques such as a drop tower, sounding rocket, parabolic flight plane and the Space Station. We describe two techniques that give promise of further advance-an atom chip and an all-optical trap-and present recent experimental results. Basic research in new regimes of observation has generally led to scientific discoveries and new technologies that benefit society. We expect this to be the case as the low temperature frontier advances and we propose some new opportunities for research.

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Deep cooling of optically trapped atoms implemented by magnetic levitation without transverse confinement

Zhou

Zhai

et al. 2017

Review of Scientific Instruments

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We report a setup for the deep cooling of atoms in an optical trap. The deep cooling is implemented by eliminating the influence of gravity using specially constructed magnetic coils. Compared to the conventional method of generating a magnetic levitating force, the lower trap frequency achieved in our setup provides a lower limit of temperature and more freedoms to Bose gases with a simpler solution. A final temperature as low as ∼6nK is achieved in the optical trap, and the atomic density is decreased by nearly two orders of magnitude during the second stage of evaporative cooling. This deep cooling of optically trapped atoms holds promise for many applications, such as atomic interferometers, atomic gyroscopes, and magnetometers, as well as many basic scientific research directions, such as quantum simulations and atom optics.

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Comparison of different techniques in optical trap for generating picokelvin 3D atom cloud in microgravity

Cited by 9 publications

References 26 publications

Numerical study of evaporative cooling in the space station

Numerical study of evaporative cooling in the space station

The emergence of picokelvin physics

Deep cooling of optically trapped atoms implemented by magnetic levitation without transverse confinement

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