The authors report on the development of a sapphire cryogenic microwave resonator oscillator with long-term fractional frequency stability of 2x10(-17)root tau for integration times tau>10(3) s and a negative drift of about 2.2x10(-15)/day. The short-term frequency instability of the oscillator is highly reproducible and also state of the art: 5.6x10(-16) for an integration time of tau approximate to 20 s. (c) 2006 American Institute of Physics.
|Pages (from-to)||203513 (3)|
|Journal||Applied Physics Letters|
|Publication status||Published - 2006|