Achieving ultracold temperature of neutral diatomic molecules is one of the pre-requested key steps for using them as a quantum platform. Owing to molecules' abundant internal structures and large electric dipole moments, a long coherence time and a long-range interaction could be achieved when we make an array of diatomic molecules trapped in optical tweezers.
To make an ultracold molecular array, several steps are planned in this research. First, a cold buffer-gas beam of molecules is generated by elastic collisions with He buffer gas after the ablation of a molecule target. Second, the molecular beam is captured in a magneto-optical trap, cooling the molecules down to the Doppler-limit regime. The last step is sub-Doppler cooling and transferring the molecules into optical dipole traps to construct an ultracold molecular array.
MgF molecules are chosen here because of their favorable energy structure for laser cooling and abundant bosonic and fermionic isotopes. We constructed a buffer-gas beam source that can generate MgF molecules and cool them down below 4 K. At this temperature, 30 % of the molecules are in the $ v=0, N=1$ state, which is the electronic ground state of the quasi-cycling transition for the magneto-optical trap. The poster will provide detailed information about the overall experiment and the performance of the buffer-gas beam source.
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|Presenter name||Kikyeong Kwon|