Differential polarizability of the strontium intercombination transition at 1064.7 nm

We measure the scalar, vector, and tensor components of the differential dynamic polarizability of the strontium intercombination transition at $1064.7\mathrm{nm}$. We compare the experimental values with the theoretical prediction based on the most recently published spectroscopic data, and find a very good agreement. We also identify a close-to-circular "magic" polarization where the differential polarizability strictly vanishes, and precisely determine its ellipticity. Our work opens new perspectives for laser cooling optically trapped strontium atoms and provides a benchmark for atomic models in the near-infrared spectral range.