Non-destructive shadowgraph imaging of ultracold atoms

Abstract

An imaging system is presented that is capable of far-detuned non-destructive imaging of a Bose-Einstein condensate with the signal proportional to the second spatial derivative of the density. Whilst demonstrated with application to ${}^{85}\text{Rb}$, the technique generalizes to other atomic species and is shown to be capable of a signal to noise of $\sim 25$ at $1$GHz detuning with $100$ in-trap images showing no observable heating or atom loss. The technique is also applied to the observation of individual trajectories of stochastic dynamics inaccessible to single shot imaging. Coupled with a fast optical phase lock loop, the system is capable of dynamically switching to resonant absorption imaging during the experiment.

4 pages, 5 figures