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Alkali metal dispensers have become an indispensable tool in the productionof atomic vapors for magnetometry, alkali vapor cell clocks, and laser coolingexperiments. A primary advantage of these dispensers is that they containalkali metal in an inert form that can be exposed to air without hazard.However, their high temperature of operation (>600 C) is undesirable for manyapplications, as it shifts the atomic speed distribution to higher values andpresents a radiative heat source that can raise the temperature of itssurroundings. For this reason, dispensers are typically not used inline-of-sight applications such as atomic beam generation. In this work, wepresent an integrated rubidium dispenser collimating device with a thickness ofonly 2 mm that produces a beam of atoms traveling primarily in the forwarddirection. We find that the collimator plate serves to both shield thedispenser's radiation as well as to moderate the velocity of the atomic beam sothat the measured longitudinal speed distribution is comparable to that of anordinary alkali oven at only a slightly elevated temperature of 200 C. Toconfirm our theory, we also constructed another compact apparatus consisting ofa dispenser and a silicon collimator and the measurements support ourconclusion. Our integrated dispenser collimator will particularly be useful inintegrated photonics and cavity QED on chip, where a localized, directed sourceof Rb vapor in small quantities is needed.

Collimated versatile atomic beam source with alkali dispensers