Short Term Frequency Stability Tests of Two Cryogenic Sapphire Oscillators

K. Watabe; John Hartnett; Clayton Locke; G. Santarelli; S. Yanagimachi; T. Shimazaki; T. Ikegami; S. Ohshima

doi:10.1143/JJAP.45.9234

Short Term Frequency Stability Tests of Two Cryogenic Sapphire Oscillators

K. Watabe, John Hartnett, Clayton Locke, G. Santarelli, S. Yanagimachi, T. Shimazaki, T. Ikegami, S. Ohshima

Graduate Research School

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

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 X 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 x 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.

Original language	English
Pages (from-to)	9234-9237
Journal	Japanese Journal of Applied Physics
Volume	45
Issue number	12
DOIs	https://doi.org/10.1143/JJAP.45.9234
Publication status	Published - 2006

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title = "Short Term Frequency Stability Tests of Two Cryogenic Sapphire Oscillators",

abstract = "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 X 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 x 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.",

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AU - Watabe, K.

AU - Hartnett, John

AU - Locke, Clayton

AU - Santarelli, G.

AU - Yanagimachi, S.

AU - Shimazaki, T.

AU - Ikegami, T.

AU - Ohshima, S.

PY - 2006

Y1 - 2006

N2 - 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 X 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 x 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.

AB - 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 X 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 x 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.

U2 - 10.1143/JJAP.45.9234

DO - 10.1143/JJAP.45.9234

M3 - Article

VL - 45

SP - 9234

EP - 9237

JO - Japanese Journal of Applied Physics

JF - Japanese Journal of Applied Physics

IS - 12

ER -

Short Term Frequency Stability Tests of Two Cryogenic Sapphire Oscillators

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