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Sensors 2018, 18(3), 717;

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

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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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