Physics – Atomic Physics
Scientific paper
2008-07-16
PRL 100, 233901 (2008)
Physics
Atomic Physics
Published in PRL 100, 233901 (2008)
Scientific paper
10.1103/PhysRevLett.100.233901
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.
Benmessai Karim
Bourgeois Pierre-Yves
Creedon Daniel Lloyd
Giordano Vincent
Kersalé Yann
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