Rotating michelson-morley experiment based on a dual cavity cryogenic sapphire oscillator

Stanwix, Paul L.; Tobar, Michael E.; Winterflood, John; Ivanov, Eugene; Susli, Mohamad; Hartnett, John G.; Kann, F. van; Wolf, Peter

doi:10.1109/freq.2004.1418561

Cited by 3 publications

(3 citation statements)

References 16 publications

(16 reference statements)

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“…One such oscillator, dubbed Nicky, has been developed in the same laboratory for a Michelson-Morley experiment. Nicky consists of two oscillators, with frequencies of 10.000 and 9.998 GHz, both with σ y (τ ) of about 10 −14 [19].…”

Section: Results and Conclusionmentioning

confidence: 99%

Second generation 50 K dual-mode sapphire oscillator

Anstie

Hartnett

Tobar

et al. 2006

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Low-temperature, high-precision sapphire resonators exhibit a turning point in mode frequencytemperature dependence at around 10 K. This, along with sapphire's extremely low dielectric losses at microwave frequencies, results in oscillator fractional frequency stabilities on the order of 10 ;15 . At higher temperatures the lack of a turning point makes single-mode oscillators very sensitive to temperature fluctuations. By exciting two quasi-orthogonal whispering gallery (WG) modes in a single sapphire resonator, a turning point in the frequencytemperature dependence can be found in the beat frequency between the two modes. A temperature control technique based on mode frequency temperature dependence has been used to maintain the sapphire at this turning point and the fractional frequency instability of the beat frequency has been measured to be at a level of 4:3 10 ;14 over 1 s, dropping to 3:5 10 ;14 over 4 s integration time.

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Section: Results and Conclusionmentioning

confidence: 99%

Second generation 50 K dual-mode sapphire oscillator

Anstie

Hartnett

Tobar

et al. 2006

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

View full text Add to dashboard Cite

show abstract

“…The oscillators have also recently been implemented in a new rotating experiment to test Lorentz Invariance [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

“…The oscillator was used as the flywheel oscillator for a microwave atomic clock based on trapped, laser-cooled ytterbium ions. This clock was the first trapped ion clock to combine the extreme accuracy possible achieved by cooling the ions to subKelvin temperatures, thus reducing relativistic frequency shifts due to ion motion to less than 1 part in 15 , with the improved signal-to-noise ratio possible by using a relatively large number (10 4 ) of ions.…”

Section: Introductionmentioning

confidence: 99%