Imaging a ${}^6$Li Atom In An Optical Tweezer 2000 Times with $\Lambda$-Enhanced Gray Molasses

Abstract

We have imaged lithium-6 thousands of times in an optical tweezer using $\Lambda$-enhanced gray molasses cooling light. Despite being the lightest alkali, with a recoil temperature of 3.5 $\mu$K, we achieve an imaging survival of 0.99950(2), which sets the new benchmark for low-loss imaging of neutral atoms in optical tweezers. Lithium is loaded directly from a MOT into a tweezer with an enhanced loading rate of 0.7. We cool the atom to 70 $\mu$K and present a new cooling model that accurately predicts steady-state temperature and scattering rate in the tweezer. These results pave the way for ground state preparation of lithium en route to the assembly of the LiCs molecule in its ground state.

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• Dual-species Optical tweezer for Rb and K atoms
• Walking with the atoms in a chemical bond : A perspective using quantum phase transition