Title :
Cryogenic whispering gallery sapphire oscillator using 4 K pulse-tube cryocooler
Author :
Watabe, Ken-ichi ; Koga, Yasuki ; Ohshima, Shin-Ichi ; Ikegami, Takeshi ; Hartnett, John G.
Author_Institution :
Nat. Metrol. Inst. of Japan-AIST, Tsukuba, Japan
Abstract :
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 9.169 K with an unloaded Q-factor of 7×108. The prototype SLC oscillator was designed to oscillate at 9.195 GHz and exhibited a fractional frequency stability of 2×10-13 at integration times of 10 s. We project a fractional frequency stability better than 1 part in 10-14 for integration times of 1 s to 100 s with a better temperature stabilized housing and with improved vibration isolation.
Keywords :
Q-factor; cavity resonators; cryogenic electronics; frequency stability; microwave oscillators; sapphire; vibration isolation; 1 to 100 s; 4 K; 9.169 K; 9.195 GHz; Al2O3; Q-factor; cryogenic whispering gallery sapphire resonator oscillator; frequency stability; pulse tube cryocooler; sapphire crystal; sapphire loaded cavity oscillator design; temperature stabilization; vibration isolation; Copper; Cryogenics; Frequency; Microwave oscillators; Phase shifters; Q factor; Stability; Temperature; Vibrations; Whispering gallery modes;
Conference_Titel :
Frequency Control Symposium and PDA Exhibition Jointly with the 17th European Frequency and Time Forum, 2003. Proceedings of the 2003 IEEE International
Print_ISBN :
0-7803-7688-9
DOI :
10.1109/FREQ.2003.1275122
