Optical frequency standard based on cold Ca atoms

被引：22

作者：

Helmcke, J ^{[1
]}

Wilpers, G ^{[1
]}

Binnewies, T ^{[1
]}

Degenhardt, C ^{[1
]}

Sterr, U ^{[1
]}

Schnatz, H ^{[1
]}

Riehle, F ^{[1
]}

机构：

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

来源：

IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT | 2003年 / 52卷 / 02期

关键词：

atom interferometry; atomic clocks; laser cooling; measurement of optical frequencies; optical frequency standards;

D O I：

10.1109/TIM.2003.810025

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

An optical frequency standard (lambda = 657 nm) based on cold neutral Ca atoms released from a magnetooptical trap has been realized. Systematic contributions to the uncertainty resulting from the residual velocity of the atoms and the acceleration in the gravitational field are determined and reduced by using a combination of different atom interferometers. With the uncertainty for the effect of cold collisions reduced and an ac stark shift eliminated, the relative uncertainty in the measured frequency of the Ca clock transition is reduced to 2 . 10(-14). The application of a novel method for producing ultracold atoms showed the gotential to further reduce the relative uncertainty to below 10(-15).

引用

页码：250 / 254

页数：5

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