First phase-coherent frequency measurement of visible radiation

被引：189

作者：

Schnatz, H

Lipphardt, B

Helmcke, J

Riehle, F

Zinner, G

机构：

[1] Physikalisch-Technische Bundesanstalt (PTB), Braunschweig

来源：

PHYSICAL REVIEW LETTERS | 1996年 / 76卷 / 01期

关键词：

D O I：

10.1103/PhysRevLett.76.18

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have determined the frequency of the P-3(1)-S-1(0) intercombination transition of atomic Ca-40 stared in a magneto-optical trap to be nu = 455 986 240493.95 kHz with an estimated standard uncertainty of 0.43 kHz (delta nu/nu < 10(-12)) using a phase-coherent optical frequency chain from the Cs atomic clock to the visible. This allows the realization of the SI-unit meter according to its definition by visible radiation with 25-fold reduced uncertainty compared to previous measurements.

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页码：18 / 21

页数：4

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