We have used a pyramid magneto-optical trap (MOT) to create a compact source of cold rubidium atoms. The four dielectric-coated metal mirrors in vacuum are arranged in the form of a pyramid that creates the light field for a MOT from a single ingoing laser beam. The atoms are pushed out through a hole (aperture) in the apex of the pyramid, in a direction determined by the laser light, to give a flux of Rb-87 atoms greater than 2 × 10^10 per second with a mean velocity of 33 m/s (FWHM of 28 m/s) and a divergence of 58 mrad. The pyramid MOT has a unique mechanism for adjusting aperture size and it is highly suitable for portable quantum technology devices.
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