Cooling and trapping of ultra-cold strontium isotopic mixtures

We present the simultaneous cooling and trapping of an isotopic mixture in a magneto-optical trap and we describe the transfer of the mixture into a conservative, far-off resonant dipole trap. The mixture is prepared with a new technique that applies to intermediate and heavy alkaline earth like atoms. In this work, Sr and Sr are simultaneously loaded first into the magneto-optical trap operated on the 1S03P1 spin-forbidden line at 689 nm, and then transferred into the dipole trap. We observe fast inter-species thermalization in the dipole trap which allows one to set a lower bound on the Sr-Sr elastic cross section.