High density loading and collisional loss of laser cooled molecules in an optical trap

• URL: http://arxiv.org/abs/2307.05347v1
• Date: Tue, 11 Jul 2023 15:35:51 GMT
• Title: High density loading and collisional loss of laser cooled molecules in an optical trap
• Authors: Varun Jorapur, Thomas K. Langin, Qian Wang, Geoffrey Zheng, David DeMille
• Abstract summary: SrF molecules from a red-detuned magneto-optical trap (MOT) are compressed and cooled in a blue-detuned MOT. We observe two-body loss with rate coefficient $beta = 2.7+1.2_-0.8times 10-10 text cm3 text s-1$. Achieving this density and temperature opens a path to evaporative cooling towards quantum degeneracy of laser-cooled molecules.
• Score: 5.79316046874697
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We report optical trapping of laser-cooled molecules at sufficient density to observe molecule-molecule collisions for the first time in a bulk gas. SrF molecules from a red-detuned magneto-optical trap (MOT) are compressed and cooled in a blue-detuned MOT. Roughly 30% of these molecules are loaded into an optical dipole trap with peak number density $n_0 \approx 3\times 10^{10} \text{ cm}^{-3}$ and temperature $T\approx40$ $\mu$K. We observe two-body loss with rate coefficient $\beta = 2.7^{+1.2}_{-0.8}\times 10^{-10} \text{ cm}^3 \text{ s}^{-1}$. Achieving this density and temperature opens a path to evaporative cooling towards quantum degeneracy of laser-cooled molecules.

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