Maser Oscillation From Electronic Spin Resonance in a Cryogenic Sapphire Frequency Standard

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

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

We report the first observation of an Fe3+ maser oscillation at zero magnetic field inside a whispering gallery (WG) sapphire resonator. The described maser is new in that it operates at zero-field and with low ion concentration. At zero-field, the Fe3+ ion shows a 3-level structure related to the electron spin resonance (ESR). By applying a 31 GHz pump (vertical bar 1/2 > -> vertical bar 5/2 >), the ion operates as a maser at 12 GHz (vertical bar 5/2 > -> vertical bar 3/2 >). The maser effect is made possible by the high Q-factor (several 10(8)) of the cryogenic whispering gallery resonator. Additionnaly, the sharp cavity resonance provides short term stability. Preliminary measurements indicate a frequency stability of parts in 10(-14) (Allan deviation at 100 s), still limited by the instrument. The ultimate maser stability is still unknown.
Original languageEnglish
Pages (from-to)1606-1612
JournalInternational Journal of Modern Physics B
Volume20
Issue number11-13
DOIs
Publication statusPublished - 2006

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