Normal mode splitting and cooling induced by radiation pressure in strong coupling optomechanical cavity

Abstract

Abstract:

A model describing optomechanical dynamics via radiation-pressure coupling with a driven optical cavity was investigated by a linearized quantum Langevin equation under resolved sideband regime. Both the movable mirror and the output field present the normal mode splitting with the increasing of the input laser power and our results approach the experiment very well. The effective mechanical damping and resonance frequency shift are derived. The redshifted sideband leads to cooling of the mechanical oscillator and the blueshifted motional sideband results in amplification. Furthermore, an approximation scheme is introduced to analyze the cooling of the mechanical oscillator. Since both the normal mode splitting and cooling require working in the resolved sideband regime, whether the normal mode splitting influence the cooling of the mirror is considered. Meanwhile, the key factors that dominate the ground state cooling are also discussed.

Key words: quantum optics, optomechanical cavity, radiation pressure, normal mode splitting, cooling

CLC Number:

O431.2

CHEN Hua-jun, MI Xian-wu. Normal mode splitting and cooling induced by radiation pressure in strong coupling optomechanical cavity[J]. J4, 2012, 29(2): 153-164.

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