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Dispersive optical detection of magnetic Feshbach resonances in ultracold gases



Eite Tiesinga, B Sawyer, M Horvath, A Deb, N Kjaergaard


Magnetically tunable Feshbach resonances in ultracold atomic systems are chiefly identified and characterized through time consuming atom loss spectroscopy. We describe an off-resonant dispersive optical probing technique to rapidly locate Feshbach resonances and demonstrate the method by locating four resonances of 87Rb, between the |F = 1,mF = 1> and |F = 2,mF = 0> states. Despite the loss features being 18 G. The resonances consist of two known s-wave features in the vicinity of 9 G and 18 G and two previously unobserved p-wave features near 5 G and 10 G. We further utilize the dispersive approach to directly characterize the two-body loss dynamics for each Feshbach resonance.
Physical Review A


ultracold atoms, dispersive optical detection, collisional resonances.


Tiesinga, E. , Sawyer, B. , Horvath, M. , Deb, A. and Kjaergaard, N. (2017), Dispersive optical detection of magnetic Feshbach resonances in ultracold gases, Physical Review A, [online], (Accessed April 20, 2024)
Created August 18, 2017, Updated November 10, 2018