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

A cryogenic sapphire oscillator (CSO) has been implemented at 11.2 GHz using a low-vibration design pulse-tube 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 ¿ y = 1.4...

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Veröffentlicht in:	IEEE transactions on ultrasonics, ferroelectrics, and frequency control ferroelectrics, and frequency control, 2010-05, Vol.57 (5), p.1034-1038
Hauptverfasser:	Hartnett, John G, Nand, Nitin R, Chao Wang, Le Floch, Jean-Michel
Format:	Artikel
Sprache:	eng
Schlagworte:	Bellows Copper Counting circuits Cryogenics Exact sciences and technology Ferroelectric materials Frequency measurement Instability Liquid helium Measurements common to several branches of physics and astronomy Metrology, measurements and laboratory procedures Microwave oscillators Noise Oscillators Physics Resonance Resonant frequency Sapphire State of the art Temperature control Time and frequency Vibration
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Beschreibung
Zusammenfassung:	A cryogenic sapphire oscillator (CSO) has been implemented at 11.2 GHz using a low-vibration design pulse-tube 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 ¿ y = 1.4 × 10 -5 ¿ -1/2 for integration times 1 < ¿ < 10 s, dominated by white frequency noise. The minimum ¿ y = 5.3 × 10 -16 for the two oscillators was reached at ¿ = 20 s. Assuming equal contributions from both CSOs, the single oscillator phase noise S ¿ ¿ -96 dB.rad 2 /Hz at 1 Hz set from the carrier.
ISSN:	0885-3010 1525-8955
DOI:	10.1109/TUFFC.2010.1515