NDLI: Temperature compensated sapphire resonator for ultra-stable oscillator capability at temperatures above 77 kelvin

Content Provider	IEEE Xplore Digital Library
Author	Dick, G.J. Santiago, D.G. Wang, R.T.
Copyright Year	1994
Description	Author affiliation: Jet Propulsion Lab., California Inst. of Technol., Pasadena, CA, USA (Dick, G.J.; Santiago, D.G.; Wang, R.T.)
Abstract	We report on the design and test of a whispering gallery sapphire resonator for which the dominant (WGH/sub n11/) microwave mode family shows frequency-stable, compensated operation for temperatures above 77 kelvin. The resonator makes possible a new ultra-stable oscillator (USO) capability that promises performance improvements over the best available crystal quartz oscillators in a compact cryogenic package. A mechanical compensation mechanism, enabled by the difference between copper and sapphire expansion coefficients, tunes the resonator to cancel the temperature variation of sapphire's dielectric constant. In experimental tests, the WGH/sub 811/ mode showed a frequency turn-over temperature of 87 K in agreement with finite element calculations. Preliminary tests of oscillator operation show an Allan deviation of frequency variation of 1.4-6/spl times/10/sup -12/ for measuring times 1 second /spl les//spl tau//spl les/100 seconds with unstabilized resonator housing temperature and a mode Q of 2/spl times/10/sup 6/. We project a frequency stability 10/sup -14/ for this resonator with stabilized housing temperature and with a mode Q of 10/sup 7/.<>
Starting Page	421
Ending Page	432
File Size	998761
Page Count	12
File Format	PDF
ISBN	0780319451
DOI	10.1109/FREQ.1994.398302
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1994-06-01
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Temperature Frequency Testing Microwave oscillators Kelvin Cryogenics Packaging Copper Dielectric constant Finite element methods
Content Type	Text
Resource Type	Article

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