Measurement of the Fundamental Thermal Noise Limit in a Cryogenic Sapphire Frequency Standard Using Bimodal Maser Oscillations

K. Benmessai, D.L. Creedon, Michael Tobar, P.Y. Bourgeois, Y. Kersale, V. Giordano

Research output: Contribution to journalArticle

29 Citations (Scopus)
312 Downloads (Pure)

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 10-14τ-1/2 with only 0.5 pW of output power.
Original languageEnglish
Pages (from-to)online - approx 5-20pp
JournalPhysical Review Letters
Volume100
Issue number23
DOIs
Publication statusPublished - 2008

Fingerprint Dive into the research topics of 'Measurement of the Fundamental Thermal Noise Limit in a Cryogenic Sapphire Frequency Standard Using Bimodal Maser Oscillations'. Together they form a unique fingerprint.

  • Cite this