  An optical technique based on stability transfer among modes of a monolithic
optical microresonator is proposed for long therm frequency stabilization of a
radiofrequency (RF) oscillator. We show that locking two resonator modes,
characterized with dissimilar sensitivity in responding to an applied forcing
function, to a master RF oscillator allows enhancing the long term stability of
a slave RF oscillator locked to two resonator modes having nearly identical
sensitivity. For instance, the stability of a 10 MHz master oscillator
characterized with Allan deviation of 10^-7 at 10^4s can be increased and
transferred to a slave oscillator with identical stability performance, so that
the resultant Allan deviation of the slave oscillator becomes equal to 10-13 at
10^4s. The method does not require absolute frequency references to achieve
such a performance.
