Two-stage magneto-optical trapping and narrow-line cooling of Li6 atoms to high phase-space density

J. Sebastian, Ch. Gross, Ke Li, H. C. J. Gan, Wenhui Li, and K. Dieckmann
Phys. Rev. A 90, 033417 – Published 15 September 2014

Abstract

We report an experimental study of peak and phase-space density of a two-stage magneto-optical trap (MOT) of Li6 atoms, which exploits the narrower 2S1/23P3/2 ultraviolet (UV) transition at 323 nm following trapping and cooling on the more common D2 transition at 671 nm. The UV MOT is loaded from a red MOT and is compressed to give a high phase-space density up to 3×104. Temperatures as low as 33μK are achieved on the UV transition. We study the density limiting factors and in particular find a value for the light-assisted collisional loss coefficient of 1.3±0.4×1010 cm3/s for low repumping intensity.

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  • Received 12 July 2014

DOI:https://doi.org/10.1103/PhysRevA.90.033417

©2014 American Physical Society

Authors & Affiliations

J. Sebastian1, Ch. Gross1, Ke Li1, H. C. J. Gan1, Wenhui Li1,2, and K. Dieckmann1,2,*

  • 1Centre for Quantum Technologies (CQT), 3 Science Drive 2, Singapore 117543
  • 2Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542

  • *phydk@nus.edu.sg

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Vol. 90, Iss. 3 — September 2014

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