Tuning Frequency Stability in Micromechanical Resonators with Parametric Pumping

In this work we experimentally investigate the influence of parametric amplification and parametric suppression on the frequency stability of micromechanical resonators. We isolate the influence of phase slope tuning from changes in the vibrational amplitude and find that parametric suppression improves the frequency stability in the thermal noise regime by over threefold, while parametric amplification degrades the frequency stability by nearly a factor of two.