Atom Refrigerator Sketch

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© Brian Busch and Lene V. Hau.

This sketch of an atom refrigerator shows the atom source ("candlestick" atomic beam source), the atom slower, and the optical molasses which is created in the main vacuum chamber by three pairs of counterpropagating laser beams (MOT beams; the third laser beam pair goes in and out of the plane of the sketch). The electromagnet ("Dee" magnet) is used to hold the laser-cooled atoms in place during their further cooling to nanokelvin temperatures where Bose-Einstein condensates start to form. (Unit: 7)