Using methods to cool and trap atoms with laser light, new frequency primary standards has been developed in NMIJ. This type of standards is called "atomic fountain" because cooled atoms motion looks like a fountain flow. We have obtained the Ramsey fringes with a linewidth of 0.8 Hz (fig.). Its linewidth is 100th smaller than that in former type of standards. It is expected that new type of standards achieve high stability and accuracy. And the short-term stability has been represented by 7×10-13×t-1/2.
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| Ramsey fringes |
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| Relational Information |
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AIST Today Vol. 2, No. 8 (2002) 19
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No.6 Autumn 2002
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