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Cryogenic sapphire microwave resonator-oscillator with exceptional stability

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3 Author(s)
Luiten, A.N. ; Dept. of Phys., Western Australia Univ., Nedlands, WA ; Mann, A.G. ; Blair, D.G.

Microwave oscillators of exceptional short term stability have been realised from cryogenic sapphire resonators with loaded Q-factors of 109 at X-band and 6K by employing a synthesis of loop oscillator operation with active Pound frequency stabilisation. These oscillators have exhibited a fractional frequency stability of 3-4×10-15 for integration times from 0.3 to 100 degrading to 10-14 at 1000 s, and long term drifts of a few parts in 1013 per day

Published in:

Electronics Letters  (Volume:30 ,  Issue: 5 )