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We experimentally demonstrate collective strong coupling, opticalbi-stability (OB) and all-optical switching in a system consisting of ultracold85Rb atoms, trapped in a dark magneto-optical trap (DMOT), coupled to anoptical Fabry-Perot cavity. The strong coupling is established by measuring thevacuum Rabi splitting (VRS) of a weak on-axis probe beam. The dependence of VRSon the probe beam power is measured and bi-stability in the cavity transmissionis observed. We demonstrate control over the transmission of the probe beamthrough the atom-cavity system using a free-space off-axis control beam andshow that the cavity transmission can be switched on and off in micro-secondtimescales using micro-Watt control powers. The utility of the system as a toolfor sensitive, in-situ and rapid measurements is envisaged.

All-optical switching in a continuously operated and strongly coupled atom-cavity system