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Sensors 2018, 18(3), 717; doi:10.3390/s18030717

Experimental Investigation of the Influence of the Laser Beam Waist on Cold Atom Guiding Efficiency

Department of Instrumentation Science and Opto-electronics Engineering, Beihang University, Beijing 100191, China
Author to whom correspondence should be addressed.
Received: 5 February 2018 / Revised: 26 February 2018 / Accepted: 27 February 2018 / Published: 28 February 2018
(This article belongs to the Section Physical Sensors)
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The primary purpose of this study is to investigate the influence of the vertical guiding laser beam waist on cold atom guiding efficiency. In this study, a double magneto-optical trap (MOT) apparatus is used. With an unbalanced force in the horizontal direction, a cold atomic beam is generated by the first MOT. The cold atoms enter the second chamber and are then re-trapped and cooled by the second MOT. By releasing a second atom cloud, the process of transferring the cold atoms from MOT to the dipole trap, which is formed by a red-detuned converged 1064-nm laser, is experimentally demonstrated. And after releasing for 20 ms, the atom cloud is guided to a distance of approximately 3 mm. As indicated by the results, the guiding efficiency depends strongly on the laser beam waist; the efficiency reaches a maximum when the waist radius (w0) of the laser is in the range of 15 to 25 μm, while the initial atom cloud has a radius of 133 μm. Additionally, the properties of the atoms inside the dipole potential trap, such as the distribution profile and lifetime, are deduced from the fluorescence images. View Full-Text
Keywords: cold atom guiding; beam waist; guiding efficiency cold atom guiding; beam waist; guiding efficiency

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Song, N.; Hu, D.; Xu, X.; Li, W.; Lu, X.; Song, Y. Experimental Investigation of the Influence of the Laser Beam Waist on Cold Atom Guiding Efficiency. Sensors 2018, 18, 717.

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