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Cooperative scattering of light by an extended object such as an atomicensemble or a dielectric sphere is fundamentally different from scattering frommany point-like scatterers such as single atoms. Homogeneous distributions tendto scatter cooperatively, whereas fluctuations of the density distributionincrease the disorder and suppress cooperativity. In an atomic cloud, theamount of disorder can be tuned via the optical thickness, and its role can bestudied via the radiation force exerted by the light on the atomic cloud.Monitoring cold $^{87}\text{Rb}$ atoms released from a magneto-optical trap, wepresent the first experimental signatures of radiation force reduction due tocooperative scattering. The results are in agreement with an analyticalexpression interpolating between the disorder and the cooperativity-dominatedregimes.

Observation of a Cooperative Radiation Force in the Presence of Disorder