Optical frequency synthesis from a cryogenic microwave sapphire oscillator

John Mcferran, S.T. Dawkins, Paul Stanwix, Michael Tobar, Andre Luiten

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


We demonstrate an optical frequency comb with fractional frequency instability of less than or similar to 2 x 10(-14) at measurement times near 1 s, when the 10th harmonic of the comb spacing is controlled by a liquid helium cooled microwave sapphire oscillator. The frequency instability of the comb is estimated by comparing it to a cavity-stabilized optical oscillator. The less conventional approach of synthesizing low-noise optical signals from a microwave source is relevant when a laboratory has microwave sources with frequency stability superior to their optical counterparts. We describe the influence of high frequency environmental noise and how it impacts the phase-stabilized frequency comb performance at integration times less than 1 s. (c) 2006 Optical Society of America.
Original languageEnglish
Pages (from-to)4316-4327
JournalOptics Express
Issue number10
Publication statusPublished - 2006


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