Sub-Doppler cooling of magnesium fluoride molecules
Jin Wei(魏晋)1, Di Wu(吴迪)1, Taojing Dong(董涛晶)1, Chenyu Zu(祖晨宇)1, Yong Xia(夏勇)1,2,3,†, and Jianping Yin(印建平)1
1 State Key Laboratory of Precision Spectroscopy, School of Physics and Electronic Science, East China Normal University, Shanghai 200241, China; 2 Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China; 3 NYU-ECNU Institute of Physics at NYU Shanghai, Shanghai 200062, China
Abstract We present a theoretical approach to achieve sub-Doppler cooling of magnesium fluoride (MgF) molecules by tuning the AC Stark shift with a blue-detuned laser. We study three blue-detuned magneto-optical trapping (MOT) schemes by using the Bayesian optimization method with the optical Bloch equations. We perform a comprehensive analysis of the relationship between the force in the MOT and the velocities and positions of the MgF molecules. Monte-Carlo simulations show that our MOT schemes can achieve a temperature as low as 28 μK and a density as high as cm at the conditions of a ratio of two laser intensities of 2:7, a detuning of 3 and a polarization configuration of . These results provide a clear way for transferring a large number of MgF molecules into a conservative trap to enhance the subsequent cooling such as evaporative or sympathetic cooling.
Jin Wei(魏晋), Di Wu(吴迪), Taojing Dong(董涛晶), Chenyu Zu(祖晨宇), Yong Xia(夏勇), and Jianping Yin(印建平) Sub-Doppler cooling of magnesium fluoride molecules 2025 Chin. Phys. B 34 063701
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