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We report in this letter the outstanding frequency stability performances ofan autonomous cryogenique sapphire oscillator presenting a flicker frequencynoise floor below 2e-16 near 1,000 s of integration time and a long term AllanDeviation (ADEV) limited by a random walk process of 1e-18/sqr(tau). Thefrequency stability qualification at this level called for the implementationof sophisticated instrumentation associated with ultra-stable frequencyreferences and ad hoq averaging and correlation methods.

A Cryogenic Sapphire Resonator Oscillator with 1e-16 mid-term fractional frequency stability