Temperature of laser-cooled 171Yb+ ions and application to a microwave frequency standard

被引：13

作者：

Warrington, RB ^{[1
]}

Fisk, PTH ^{[1
]}

Wouters, MJ ^{[1
]}

Lawn, MA ^{[1
]}

机构：

[1] CSIRO, Natl Measurement Lab, Sydney, NSW 2070, Australia

来源：

IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL | 2002年 / 49卷 / 08期

关键词：

D O I：

10.1109/TUFFC.2002.1026029

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

Microwave frequency standards based on buffer gas-cooled Yb-171(+) ions have demonstrated high stability but are limited in accuracy by the second-order Doppler shift caused by thermal motion. We have previously obtained near shot noise-limited Ramsey fringes with a laser-cooled ion cloud. Here, we present measurements confirming that the ion temperature remains <1 K throughout the microwave interrogation period for a Ramsey pulse separation of up to 10 s and longer. The potential stability of the ions as a frequency standard is better than sigma(y)(tau) = 5 X 10(-14)tau(-1/2), and estimates of the systematic offsets to the clock frequency and their uncertainties indicate that a total uncertainty of four parts in 10(15) or better is achievable.

引用

页码：1166 / 1174

页数：9

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