A
Zeeman slower is a
scientific apparatus that is commonly used in
quantum optics to cool a
beam of atoms from room temperature or above to a few
kelvins. At the entrance of the Zeeman slower the average speed of atoms is on the order of a few hundred m/s. The spread of velocity is also in the order of a few hundred m/s. Final speed at the exit of the slower is few 10 m/s with an even smaller spread.