Short Term Frequency Stability Tests of Two Cryogenic Sapphire Oscillators
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概要
- 論文の詳細を見る
Ultra-high short-term frequency stability has been realized in microwave oscillators based on liquid helium cooled sapphire resonators which operate on the same Whispering Gallery mode. Two cryogenic sapphire oscillators were built to evaluate their stability at short averaging times. These oscillators exhibited a fractional frequency stability of $1.1\times 10^{-15}$ at an averaging time of 1 s, which is more than 100 times better than that of a hydrogen maser. For averaging times between 2 and 640 s the measured oscillator fractional frequency instability was below $10^{-15}$ with a minimum of $5.5\times 10^{-16}$ at an averaging time of 20 s. The noise floors of the control servos which contribute to the short-term frequency stability are also discussed.
- 2006-12-15
著者
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Watanabe Ken-ichi
National Research Institute of Aquaculture, Fisheries Research Agency
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Ohshima Shin-ichi
National Metology Institute Of Japan
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HARTNETT John
School of Physics, The University of Western Australia
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Ikegami Takeshi
National Metology Institute Of Japan/aist
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Locke Clayton
School of Physics, University of Western Australia, 35 Stirling Hwy, Crawley, WA, 6009, Australia
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Locke Clayton
School of Physics, University of Western Australia, 35 Stirling Hwy, Crawley, WA 6009, Australia
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Santarelli Giorgio
LNE-SYRTE, Observatoire de Paris, 61 avenue de l'Observatoire, 75014 Paris, France
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Yanagimachi Shinya
National Metrology Institute of Japan (NMIJ), AIST, Tsukuba, Ibaraki 305-8563, Japan
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Shimazaki Takeshi
National Metrology Institute of Japan (NMIJ), AIST, Tsukuba, Ibaraki 305-8563, Japan
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Santarelli Giorgio
LNE-SYRTE, Observatoire de Paris, 61 avenue de l'Observatoire, 75014 Paris, France
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Watabe Ken-ichi
National Metrology Institute of Japan (NMIJ), AIST, Tsukuba, Ibaraki 305-8563, Japan
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Ikegami Takeshi
National Metrology Institute of Japan (NMIJ), AIST, Tsukuba, Ibaraki 305-8563, Japan
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Hartnett John
School of Physics, University of Western Australia, 35 Stirling Hwy, Crawley, WA, 6009, Australia
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