Abstract
An intracavity-squeezed cooling scheme is proposed for cooling mechanical resonator close to its ground state in a three-cavity optomechanical system. It is found that in the presence of optical parametric amplifier (OPA) medium, the scheme is capable of completely inhibiting the quantum backaction heating process. Specifically, as the heating rate decreases to zero, and the net cooling rate increases, so the final phonon number decreases significantly. There are no strict requirements for the two auxiliary cavities, and the final phonon number can be less than 1 in a larger range. This scheme provides a novel idea for the subsequent ground-state cooling research.