We demonstrate a compact magneto-optical trap (MOT) of alkaline-earth atoms using a nanofabricated diffraction grating chip. A single input laser beam, resonant with the broad 1S0 → 1P1 transition of strontium, forms the MOT in combination with three diffracted beams from the grating chip and a magnetic field produced by permanent magnets. A differential pumping tube limits the effect of the heated, effusive source on the background pressure in the trapping region. The system has a total volume of around 2.4 l. With our setup, we have trapped up to 5 × 106 88Sr atoms at a temperature of ∼6 mK, and with a trap lifetime of ∼1 s. Our results will aid the effort to miniaturize quantum technologies based on alkaline-earth atoms.
Confinement of an alkaline-earth element in a grating magneto-optical trap
A. Sitaram, P. K. Elgee, G. K. Campbell, N. N. Klimov, S. Eckel, D. S. Barker; Confinement of an alkaline-earth element in a grating magneto-optical trap. Rev. Sci. Instrum. 1 October 2020; 91 (10): 103202. https://doi.org/10.1063/5.0019551
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