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We present a novel locking scheme for active length-stabilization andfrequency detuning of a cavity optomechanical device based on the opticalspring effect. The scheme can be used as an alternative to thePound-Drever-Hall locking technique but in contrast doesn't require signalprocessing on time-scales of the cavity decay rate. It is thereforeparticularly suited for stabilizing micro cavities, where this time-scale canbe extremely fast. The error signal is generated through the optical springeffect, i.e. the detuning-dependent frequency-shift of a nanomechanicaloscillator that is dispersively coupled to the intra-cavity light field. Weexplain the functional principle of the lock and characterize its performancein terms of bandwidth and gain profile. The optical spring locking scheme canbe implemented without larger efforts in a wide variety of optomechanicalsystems in the unresolved sideband regime.

A cavity optomechanical locking scheme based on the optical spring effect