Maser oscillation in a whispering-gallery-mode microwave resonator

P.Y. Bourgeois, N. Bazin, Y. Kersale, V. Giordano, Michael Tobar, M. Oxborrow

Research output: Contribution to journalArticlepeer-review

50 Citations (Scopus)


We report the observation of above-threshold maser oscillation in a whispering-gallery (WG)-mode resonator, whose quasitransverse-magnetic, 17th-azimuthal-order WG mode, at a frequency of approximately 12.038 GHz, with a loaded Q of several hundred million, is supported on a cylinder of monocrystalline sapphire. An electron spin resonance associated with Fe3+ ions, that are substitutively included within the sapphire at an effective concentration of a few parts per billion, coincides in frequency with that of the (considerably narrower) WG mode. By applying a cw "pump" to the resonator at a frequency of approximately 31.34 GHz, with no applied dc magnetic field, the WG ("signal") mode is energized through a three-level maser scheme. Preliminary measurements demonstrate a frequency stability (Allan deviation) of a few times 10(-14) for sampling intervals up to 100 s. (c) 2005 American Institute of Physics.
Original languageEnglish
Pages (from-to)224104-1-224104-3
JournalApplied Physics Letters
Issue number22
Publication statusPublished - 2005


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