Frequency Stability of 1x10(sup -13) in a Compensated Sapphire Oscillator Operating Above 77K

摘要

We report on the design and test of a whispering gallery sapphire resonator for which the dominant (WGH<font size=1>(sub n11)</font>) 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.