Conference Proceedings

High Power Solid-State Sapphire Whispering Gallery Mode Maser

Daniel L Creedon, Karim Benmessai, Michael E Tobar, John G Hartnett, Pierre-Yves Bourgeois, Yann Kersale, Jean-Michel Le Floch, Vincent Giordano

2009 JOINT MEETING OF THE EUROPEAN FREQUENCY AND TIME FORUM AND THE IEEE INTERNATIONAL FREQUENCY CONTROL SYMPOSIUM, VOLS 1 AND 2 | IEEE | Published : 2009

Abstract

We present new results on a cryogenic solid-state maser frequency standard, which relies on the excitation of Whispering Gallery (WG) modes within a doped monocrystalline sapphire resonator ((α-Al2O3). Included substitutively within the highest purity HEMEX-grade sapphire crystal lattice are Fe2+ impurities at a concentration of parts per million, an unavoidable result of the manufacturing process. Mass conversion of Fe 2+ to Fe3+ ions was achieved by thermally annealing the sapphire in air. Above-threshold maser oscillation was then excited in the resonator at zero applied DC magnetic field by pumping high-Q WG modes coincident in frequency with the Electron Spin Resonance (ESR) energy leve..

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Funding Acknowledgements

This work was supported by the Australian Research Council (ARC ), the Agence Nationale de la Recherche, and Centre National dEtudes Spatiales (CNES). The authors thank the EFTF/IFCS 2009 conference committee and the Graduate School of Research at the University of Western Australia for travel support.