Cripe, JonathanAggarwal, N.singh, RobinjeetLanza, RobertLibson, AdamYap, Min JetCole, GarrettMcClelland, DavidMavalvala, NergisCorbitt, Thomas2021-05-132021-05-131050-2947http://hdl.handle.net/1885/232992We describe and demonstrate a method to control a detuned movable-mirror Fabry-Pérot 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 antidamping 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.This work was supported by the National Science Foundation CAREER Grants No. PHY-1150531, as well as No. PHY1707840 and No. PHY-1404245. M.J.Y. and D.E.M. receive support from the Australian Research Council through Project No. CE170100004 (OzGrav).application/pdfen-AU© 2018 American Physical Society2018-01-1810.1103/PhysRevA.97.0138272020-11-23