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Journals and Conferences
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 10 16 1 2 for integration times ( ) of 1 to 4 s and a minimum of 2 4 10 16 at 32 s. For integration times… (More)
A new method of compensating the frequency-temperature dependence of high-and monolithic sapphire dielectric resonators near liquid nitrogen temperature is presented. This is achieved by doping monocrystalline sapphire with Ti(3+) ions. This technique offers significant advantages over other methods.
We show that temperature compensation based on differential thermal expansion between sapphire and fused silica can be used to create a Fabry-Perot cavity with an exceptionally low coefficient of thermal expansion at low temperatures. We describe the design of such a cavity that utilizes shaped fused silica mirrors and a sapphire spacer. The geometry of the… (More)