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We demonstrate the interaction-induced blockade effect in an ultracold$^{88}$Sr gas via studying the time dynamics of a two-photon excitation to thetriplet Rydberg series $5\mathrm{s}n\mathrm{s}\, ^3\textrm{S}_1$ for fivedifferent principle quantum numbers $n$ ranging from 19 to 37. By using amulti-pulse excitation sequence to increase the detection sensitivity we couldidentify Rydberg-excitation-induced atom losses as low as $<1\%$. Based on anoptical Bloch equation formalism, treating the Rydberg-Rydberg interaction on amean-field level, the van der Waals coefficients are extracted from theobserved dynamics, which agree fairly well with \emph{ab initio} calculations.

Rydberg blockade in an ultracold strontium gas revealed by two-photon excitation dynamics