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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
Publication Date: 2004/09/01
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.