Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/86856
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Type: Journal article
Title: Cryogenic-sapphire-oscillator-based reference signal at 1 GHz with 10⁻¹⁵ level instability
Other Titles: Cryogenic-sapphire-oscillator-based reference signal at 1 GHz with 10(-15) level instability
Author: Watabe, K.
Yanagimachi, S.
Takamizawa, A.
Ikegami, T.
Ohshima, S.
Santarelli, G.
Locke, C.
Hartnett, J.
Citation: Japanese Journal of Applied Physics, 2008; 47(9):7390-7392
Publisher: Japan Society of Applied Physics
Issue Date: 2008
ISSN: 0021-4922
1347-4065
Statement of
Responsibility: 
Ken-ichi Watabe, Shinya Yanagimachi, Akifumi Takamizawa, Takeshi Ikegami, Shin-ichi Ohshima, Giorgio Santarelli, Clayton R. Locke, and John G. Hartnett
Abstract: We describe a 1 GHz reference signal with 10-15 level fractional frequency stability for averaging times longer than 1 s, synthesized from a 10.8 GHz oscillation frequency of a cryogenic-sapphire-resonator-based ultra-stable oscillator and phase locked to a hydrogen maser with a time constant of about 1000 s. The degradation of the short term stability of the reference signal by phase locking to the hydrogen maser was evaluated. We also report on the implementation of the 1 GHz signal down converted to 5 MHz as a reference oscillator for a cesium atomic fountain frequency standard.
Keywords: cryogenic sapphire resonator
frequency stability
frequency synthesizer
microwave oscillator
reference signal
hydrogen maser
Rights: ©2008 The Japan Society of Applied Physics
DOI: 10.1143/JJAP.47.7390
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