Abstract
Extremely high short-term frequency stability has been realized in microwave oscillators based on liquid-helium-cooled sapphire dielectric resonators with a modified mounting structure. These oscillators have exhibited an Allan deviation of about 5.4 X 10(-16)tau (-1/2) for integration times (tau) of 1 to 4 s and a minimum of 2.4 x 10(-16) at 32 s. For integration times longer than 100 s, the frequency stability is approximately 3 x 10(-17)tau (1/2) and the relative drift per day is about 10(-13) This stability is the best reported to date for any microwave source over integration times less than 100 s.
| Original language | English |
|---|---|
| Pages (from-to) | 519-521 |
| Journal | IEEE Transactions on Instrumentation and Measurement |
| Volume | 50 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 2001 |