Why is a vacuum required?

  1. Prerequisite of MOT
  2. Prerequisite of single-atom optical tweezer Without the vacuum, the background collision effect is significant so capturing a single atom using an optical tweezer is difficult.
  3. Prerequisite of the long-lived Rydberg atom

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https://youtu.be/AtKg32AAPTU?si=5tltK_DvIL-Kq74i

Bake out

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bakeout

Ion pump (SIP)

(NEG) pump

ion on-and-off

NEG on - (permanent-)off

ion on