|Title||Dispersive optical detection of magnetic Feshbach resonances in ultracold gases|
|Publication Type||Journal Article|
|Year of Publication||2017|
|Authors||Sawyer, BJ, Horvath, MSJ, Tiesinga, E, Deb, AB, Kjærgaard, N|
|Journal||Physical Review A|
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 ≲100 mG wide, we require only 21 experimental runs to explore a magnetic field range >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.