Cryogenic sapphire oscillator using a low- vibration design pulse-tube cryocooler

First results

John G. Hartnett, Nitin R. Nand, Chao Wang, Jean Michel Le Floch

Research output: Contribution to journalArticle

19 Citations (Scopus)


A cryogenic sapphire oscillator (CSO) has been implemented at 11.2 GHz using a low-vibration design pulsetube cryocooler. Compared with a state-of-the-art liquid helium cooled CSO in the same laboratory, the square root Allan variance of their combined fractional frequency instability is σy = 1.4 × 10-15τ-1/2 for integration times 1 < τ < 10 s, dominated by white frequency noise. The minimum σy = 5.3 × 10-16 for the two oscillators was reached at τ = 20 s. Assuming equal contributions from both CSOs, the single oscillator phase noise Sφ -96 dB.rad 2/Hz at 1 Hz set from the carrier.

Original languageEnglish
Article number5456252
Pages (from-to)1034-1038
Number of pages5
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Issue number5
Publication statusPublished - May 2010

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