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We report on the realization of a magneto-optical trap (MOT) for metastablestrontium operating on the 2.92 $\mu$m transition between the energy levels$5s5p~^3\mathrm{P}_2$ and $5s4d~^3\mathrm{D}_3$. The strontium atoms areinitially captured in a MOT operating on the 461 nm transition between theenergy levels $5s^2~^1\mathrm{S}_0$ and $5s5p~^1\mathrm{P}_1$, prior to beingtransferred into the metastable MOT and cooled to a final temperature of 6$\mu$K. Challenges arising from aligning the mid-infrared and 461 nm light aremitigated by employing the same pyramid reflector to realize both MOTs.Finally, the 2.92 $\mu$m transition is used to realize a full cooling sequencefor an optical lattice clock, in which cold samples of $^{87}\mathrm{Sr}$ areloaded into a magic-wavelength optical lattice and initialized in aspin-polarized state to allow high-precision spectroscopy of the$5s^2~^1\mathrm{S}_0$ to $5s5p~^3\mathrm{P}_0$ clock transition.

A mid-infrared magneto-optical trap of metastable strontium for an optical lattice clock