Influence of the ESR saturation on the power sensitivity of cryogenic sapphire resonators

Abstract

Here, we study the paramagnetic ions behavior in presence of a strong microwave electromagnetic field sustained inside a cryogenic sapphire whispering gallery mode resonator. 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. These observations that in turn allow us to optimize the CSO operation, are well explained by the Electron Spin Resonance (ESR) saturation of the paramagnetic impurities contained in the sapphire crystal.

8 pages, 9 figures

References in corpus (2)

• Measurement of fundamental thermal noise limit in a cryogenic sapphire frequency standard using bimodal maser oscillations
• Hybrid Electron Spin Resonance and Whispering Gallery Mode Resonance Spectroscopy of Fe3+ in Sapphire

Cited by in corpus (2)

• A Cryogenic Sapphire Resonator Oscillator with 1e-16 mid-term fractional frequency stability
• Power-to-Frequency Conversion in Cryogenic Sapphire Resonators