Cryogenic Whispering Gallery Sapphire Oscillator for Microwave Frequency Standard Applications

Ken-ichi WATABE  Yasuki KOGA  Shin-ichi OHSHIMA  Takeshi IKEGAMI  John G. HARTNETT  

IEICE TRANSACTIONS on Electronics   Vol.E87-C   No.9   pp.1640-1642
Publication Date: 2004/09/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Microwaves, Millimeter-Waves
sapphire,  whispering gallery mode,  4 K pulse-tube cryocooler,  microwave oscillator,  frequency stability,  

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A cryogenic Whispering Gallery sapphire resonator oscillator has been investigated using a 4 K pulse-tube cryocooler. The turnover temperature of the chosen mode in the sapphire crystal was 9.17 K with an unloaded Q-factor of 7108. The prototype sapphire-loaded cavity oscillator was designed to oscillate at 9.195 GHz. A fractional frequency stability of 210-13 was measured at integration times of 10 s.