Measurement of the fundamental thermal noise limit in a cryogenic sapphire frequency standard using bimodal maser oscillations |
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Authors: | Benmessai Karim Creedon Daniel Lloyd Tobar Michael Edmund Bourgeois Pierre-Yves Kersalé Yann Giordano Vincent |
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Institution: | Institut FEMTO-ST, UMR 6174 CNRS, Université de Franche, Comté, Besan?on, France. |
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Abstract: | We report observations of the Schawlow-Townes noise limit in a cryogenic sapphire secondary frequency standard. The effect causes a fundamental limit to the frequency stability, and was measured through the novel excitation of a bimodal maser oscillation of a Whispering Gallery doublet at 12.04 GHz. The beat frequency of 10 kHz between the oscillations enabled a sensitive probe for this measurement of fractional frequency instability of 10(-14) tau(-1/2) with only 0.5 pW of output power. |
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