Absolute optical frequency measurement of the cesium D1 line with a mode-locked laser

被引：650

作者：

Udem, T ^{[1
]}

Reichert, J ^{[1
]}

Holzwarth, R ^{[1
]}

Hänsch, TW ^{[1
]}

机构：

[1] Max Planck Inst Quanten Opt, D-85748 Garching, Germany

来源：

PHYSICAL REVIEW LETTERS | 1999年 / 82卷 / 18期

关键词：

D O I：

10.1103/PhysRevLett.82.3568

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have measured the absolute optical frequency of the cesium D-1 line at 335 THz (895 nm). This frequency provides an important link for a new determination of the fine structure constant alpha. The D-1 line has been compared with the fourth harmonic of a methane stabilized He-Ne laser at 88.4 THz (3.39 mu m). To measure the frequency mismatch of 18.39 THz between 4 x 88.4 THz = 354 THz and the D-1 line a frequency comb spanning around 244000 modes of a Kerr-lens mode-locked laser was used. We find 1167688 (81) kHz for the hyperfine splitting of the 6P(1/2) State and 335 116 048 807 (41) kHz for the hyperfine centroid from which we derive alpha(-1) = 137.0359924(41). [S0031-9007(99)09057-2].

引用

页码：3568 / 3571

页数：4