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We demonstrate a compact magneto-optical trap (MOT) of alkaline-earth atomsusing a nanofabricated diffraction grating chip. A single input laser beam,resonant with the broad $^1$S$_0\,\rightarrow \,^1$P$_1$ transition ofstrontium, forms the MOT in combination with three diffracted beams from thegrating chip and a magnetic field produced by permanent magnets. A differentialpumping tube limits the effect of the heated, effusive source on the backgroundpressure in the trapping region. The system has a total volume of around 2.4 L.With our setup, we have trapped up to $5 \times 10^6$ $^{88}$Sr atoms, at atemperature of approximately $6$ mK, and with a trap lifetime of approximately1 s. Our results will aid the effort to miniaturize optical atomic clocks andother quantum technologies based on alkaline-earth atoms.

Confinement of an alkaline-earth element in a grating magneto-optical trap