title: Unprecedented long-term frequency stability with a microwave resonator oscillator.
abstract: This article reports on the long-term frequency stability characterization of a new type of cryogenic sapphire oscillator using an autonomous pulse-tube cryocooler as its cold source. This new design enables a relative frequency stability of better than 4.5 x 10(-15) over one day of integration. To the best of our knowledge, this represents the best long-term frequency stability ever obtained with a signal source based on a macroscopic resonator.
authors.forename: Serge
authors.initials: S
authors.lastname: Grop
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Schafer
authors.forename: Pierre-Yves
authors.initials: PY
authors.lastname: Bourgeois
authors.forename: Yann
authors.initials: Y
authors.lastname: Kersale
authors.forename: Mark
authors.initials: M
authors.lastname: Oxborrow
authors.forename: Enrico
authors.initials: E
authors.lastname: Rubiola
authors.forename: Vincent
authors.initials: V
authors.lastname: Giordano