Two-stage magneto-optical trapping and narrow-line cooling of ${}^6$Li atoms to high phase-space density

Abstract

We report an experimental study of peak and phase-space density of a two-stage magneto-optical trap (MOT) of 6-Li atoms, which exploits the narrower $2S_{1/2}\to 3P_{3/2}$ ultra-violet (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 $3\times 10^{-4}$. Temperatures as low as 33 $\mu$K 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 $1.3\pm 0.4\times 10^{-10}{\text{cm}}^3/\text{s}$ for low repumping intensity.

arXiv comment4 pages, 5 figures

References in corpus (7)

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• Sub-Doppler laser cooling of 40K with Raman gray molasses on the D2 line
• All-optical production and transport of a large ${}^6$Li quantum gas in a crossed optical dipole trap
• A quantum degenerate Bose-Fermi mixture of ${}^{41}$K and ${}^6$Li
• Narrow-line cooling of ${}^{87}$Rb using 5S${}_{1/2}\to$ 6P${}_{3/2}$ open transition at 420 nm
• Narrow-linewidth cooling of ${}^6$Li atoms using the 2S-3P transition
• Comparison of an efficient implementation of gray molasses to narrow-line cooling for the all-optical production of a lithium quantum gas
• Optimal binary gratings for multi-wavelength magneto-optical traps
• Continuous loading of magneto-optical trap of Rb at narrow transition
• All-optical cooling of Fermi gases via Pauli inhibition of spontaneous emission
• Role of spontaneously generated coherence (SGC) in laser cooling of atoms