Resonator power to frequency conversion in a cryogenic sapphire oscillator
Nitin R. Nand,Stephen R. Parker,Eugene Ivanov,Jean Michel Le Floch,John G. Hartnett,John G. Hartnett,Michael E. Tobar +6 more
TLDR
In this article, the power to frequency conversion in the resonant mode of a cryogenic sapphire loaded cavity resonator was investigated and it was shown that changes in radiation pressure and temperature in the dielectric contribute to a shift in the resonance frequency.Abstract:
We report on the measurement and characterization of power to frequency conversion in the resonant mode of a cryogenic sapphire loaded cavity resonator, which is used as the frequency discriminating element of a loop oscillator circuit. Fluctuations of power incident on the resonator lead to changes in radiation pressure and temperature in the sapphire dielectric, both of which contribute to a shift in the resonance frequency. We measure a modulation and temperature independent radiation pressure induced power to frequency sensitivity of −0.15 Hz/mW and find that this is the primary factor limiting the stability of the resonator frequency.read more
Citations
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Direct terrestrial test of Lorentz symmetry in electrodynamics to 10(-18).
Moritz Nagel,Stephen R. Parker,Evgeny Kovalchuk,Paul L. Stanwix,John G. Hartnett,John G. Hartnett,Eugene Ivanov,Achim Peters,Michael E. Tobar +8 more
TL;DR: This work uses ultrastable oscillator frequency sources to perform a modern Michelson–Morley experiment and makes the most precise direct terrestrial test to date of Lorentz symmetry for the photon, constraining LorentZ violating orientation-dependent relative frequency changes.
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Searching for Scalar Dark Matter with Compact Mechanical Resonators.
TL;DR: In this paper, a large unprobed parameter space can be accessed using ultrahigh-$Q$, cryogenically cooled centimeter-scale mechanical resonators operating at 100 Hz--100 MHz frequencies, corresponding to the scalar mass range.
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High-Stability Comparison of Atomic Fountains Using Two Different Cryogenic Oscillators
Michel Abgrall,J. Guena,Michel Lours,Giorgio Santarelli,Michael E. Tobar,Sébastien Bize,S. Grop,Benoit Dubois,Ch. Fluhr,Vincent Giordano +9 more
TL;DR: The two fountain comparison down to a few 10-16 over 28 days demonstrates the potential of a cryocooled oscillator to replace a He-refilled cryogenic oscillator.
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Discovery of iron group impurity ion spin states in single crystal Y2SiO5 with strong coupling to whispering gallery photons
Maxim Goryachev,Warrick G. Farr,N. C. Carvalho,Daniel L. Creedon,Jean-Michel Le Floch,S. Probst,Pavel Bushev,Michael E. Tobar +7 more
TL;DR: In this paper, the interaction of Whispering Gallery Modes (WGMs) with dilute spin ensembles in solids is an interesting paradigm of Hybrid Quantum Systems potentially beneficial for Quantum Signal Processing applications.
Journal ArticleDOI
Influence of the ESR saturation on the power sensitivity of cryogenic sapphire resonators
TL;DR: In this article, the paramagnetic ions behavior in the presence of a strong microwave electromagnetic field sustained inside a cryogenic sapphire whispering gallery mode resonator was studied, and the high frequency measurement resolution that can be now achieved by comparing two CSOs permit for the first time to observe clearly the non-linearity of the resonator power sensitivity.
References
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