Measurement of the fundamental thermal noise limit in a cryogenic sapphire frequency standard using bimodal maser oscillations

被引：32

作者：

Benmessai, Karim ^{[1
]}

Creedon, Daniel Lloyd ^{[2
]}

Tobar, Michael Edmund ^{[2
]}

Bourgeois, Pierre-Yves ^{[1
,2
]}

Kersale, Yann ^{[1
]}

Giordano, Vincent ^{[1
]}

机构：

[1] Univ Franche Comte, CNRS, UMR 6174, Inst FEMTO ST, Besancon 25044, France

[2] Univ Western Australia, Sch Phys, Crawley, WA 6009, Australia

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 23期

关键词：

D O I：

10.1103/PhysRevLett.100.233901

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report observations of the Schawlow-Townes noise limit in a cryogenic sapphire secondary frequency standard. The effect causes a fundamental limit to the frequency stability, and was measured through the novel excitation of a bimodal maser oscillation of a Whispering Gallery doublet at 12.04 GHz. The beat frequency of 10 kHz between the oscillations enabled a sensitive probe for this measurement of fractional frequency instability of 10(-14) tau (-1/2) with only 0.5 pW of output power.

引用

页数：4

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