The optical calcium frequency standards of PTB and NIST

被引：68

作者：

Sterr, U

Degenhardt, C

Stoehr, H

Lisdat, C

Schnatz, H

Helmcke, J

Riehle, F

Wilpers, G

Oates, C

Hollberg, L

机构：

[1] Phys Tech Bundesanstalt, D-38116 Braunschweig, Germany

[2] Leibniz Univ Hannover, Inst Quantenopt, D-30167 Hannover, Germany

[3] Natl Inst Stand & Technol, Boulder, CO 80305 USA

来源：

COMPTES RENDUS PHYSIQUE | 2004年 / 5卷 / 08期

关键词：

optical frequency standard; atomic clock; laser spectroscopy;

D O I：

10.1016/j.crhy.2004.08.005

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We describe the current status of the Ca optical frequency standards with laser-cooled neutral atoms realized in two different laboratories for the purpose of developing a possible future optical atomic clock. Frequency measurements performed at the Physikalisch-Technische Bundesanstalt (PTB) and the National Institute of Standards and Technology (NIST) make the frequency of the clock transition of Ca-40 one of the best known optical frequencies (relative uncertainty 1.2 x 10(-14)) and the measurements of this frequency in both laboratories agree to well within their respective uncertainties. Prospects for improvement by orders of magnitude in the relative uncertainty of the standard look feasible. (c) 2004 Academie des sciences. Published by Elsevier SAS. All rights reserved.

引用

页码：845 / 855

页数：11

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