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arXiv · 1710.04700

Radiation-Pressure-Mediated Control of an Optomechanical Cavity

Jonathan Cripe·Nancy Aggarwal·Robinjeet Singh·Robert Lanza·Adam Libson·Min Jet Yap·Garrett D. Cole·David E. McClelland·Nergis Mavalvala·Thomas Corbitt
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Abstract

We describe and demonstrate a method to control a detuned movable-mirror Fabry-Perot cavity using radiation pressure in the presence of a strong optical spring. At frequencies below the optical spring resonance, self-locking of the cavity is achieved intrinsically by the optomechanical (OM) interaction between the cavity field and the movable end mirror. The OM interaction results in a high rigidity and reduced susceptibility of the mirror to external forces. However, due to a finite delay time in the cavity, this enhanced rigidity is accompanied by an anti-damping force, which destabilizes the cavity. The cavity is stabilized by applying external feedback in a frequency band around the optical spring resonance. The error signal is sensed in the amplitude quadrature of the transmitted beam with a photodetector. An amplitude modulator in the input path to the cavity modulates the light intensity to provide the stabilizing radiation pressure force.

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Jonathan Cripe, Nancy Aggarwal, Robinjeet Singh, Robert Lanza, Adam Libson, Min Jet Yap, Garrett D. Cole, David E. McClelland, Nergis Mavalvala, Thomas Corbitt. 2017-10-12. Radiation-Pressure-Mediated Control of an Optomechanical Cavity. https://doi.org/10.1103/physreva.97.013827

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