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In the presence of an external static magnetic field, an atomic gas becomesoptically active, showing magneto-optical rotation. In the saturated regime,the coherences among the excited substates give a nonlinear contribution to therotation of the light polarization. In contrast with the linear magneto-opticalrotation, the nonlinear counterpart is insensitive to Doppler broadening. Byvarying the temperature of a cold strontium gas, we observe both regimes bydriving the $J=0\rightarrow J=1$ transition on the intercombination line. Forthis narrow transition, the sensitivity to the static magnetic field istypically three orders of magnitude larger than for a standard broad alkalitransition.

Linear and nonlinear magneto-optical rotation on the narrow strontium intercombination line