Ultra-high stability cryocooled sapphire microwave oscillators

Ashby Hilton, J.G. Hartnett, Eugene Ivanov, Andre Luiten

Research output: Chapter in Book/Conference paperConference paper


Two nominally identical microwave cryocooled sapphire oscillators (CSO) have been implemented at the University of Adelaide. The sapphire resonators have a turning point in their frequency-temperature dependence at approximately 6 K, which delivers first-order insensitivity to temperature fluctuations when operated at this point. Using a closed system ultra-low vibration pulse-tube cryocooler with a specially design cryostat [1], it is possible to control the rms temperature fluctuations at the resonator to the 10 μK level, while maintaining a low vibration environment. Combined with a loaded Q-factor of about 109, similar oscillators have shown an Allan deviation of fractional frequency fluctuations of σy = 5.8×10 -16 at 1 s [2]. © 2014 IEEE.
Original languageEnglish
Title of host publicationIFCS 2014 - 2014 IEEE International Frequency Control Symposium, Proceedings
Place of PublicationPiscataway, NJ, USA
PublisherIEEE, Institute of Electrical and Electronics Engineers
ISBN (Print)9781479949168
Publication statusPublished - 2014
EventUltra-high stability cryocooled sapphire microwave oscillators - Taipei, Taiwan
Duration: 1 Jan 2014 → …


ConferenceUltra-high stability cryocooled sapphire microwave oscillators
Period1/01/14 → …


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