SAMOP 2021 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 8: Cold Molecules
MO 8.8: Vortrag
Freitag, 24. September 2021, 12:30–12:45, H1
Towards the Ultracold Dipolar Quantum Gas of 6Li40K — •Anbang Yang1, Sofia Botsi1, Sunil Kumar1, Victor Andre Avalos Pinilos1, Canming He1,2, and Kai Dieckmann1,2 — 1Centre for Quantum Technologies, 3 Science Drive 2, Singapore 117543 — 2Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542
We demonstrate a two-photon pathway to the rovibrational ground state of 6Li40K molecules that involve only singlet-to-singlet transitions. We start from a Feshbach state which contains a significant singlet character of 52%. With the only contributing singlet state to the molecular state being fully stretched and with control over the polarization of the laser we address a sole hyperfine component of the A1Σ+ potential without resolving its hyperfine structure. The dark resonance spectroscopy is performed with two narrow-linewidth lasers to precisely determine the two-photon resonance for STIRAP transfer to the v″=0 ground state. The strong dipolar nature of ground state 6Li40K is revealed by Stark spectroscopy. A high finesse cavity is built to simultaneously stabilize the two STIRAP lasers using the PDH lock to ensure relative phase coherence. Apart from the narrow linewidth, the phase noise of lasers is also crucial for coherent population control. We characterize the phase noise of the STIRAP laser system and estimate the loss during the population transfer. Several improvements have been made to suppress the excessive phase noise. The estimation based on the new noise characterization promises for the low loss STRIAP to the ground state.