提出了一种利用环形腔光力系统产生稳态机械模压缩的方案。该系统包含1个固定镜和2个振动镜，振动镜可看作具有三次非线性的非简谐振子,受输入激光驱动的腔内光场 对振动镜产生光辐射压力。研究了腔内光场和机械模的稳态振幅及机械模的压缩性质，结果表明: 稳态振幅随驱动功率升高而增大; 机械模可在很大参数范围内达到压缩; 可通过增强三次非线性强度、驱动激光功率或适当调节驱动场与腔场的频率失谐量来增强压缩;压缩对热声子噪音具有鲁棒性。

A steady-state mechanical modes squeezing scheme using a ring-cavity optomechanical system is proposed. The system consists of a fixed mirror and two oscillating mirrors. The oscillating mirrors can be regarded as non-harmonic oscillators with cubic nonlinearity. Cavity optical field driven by input laser produces radiation pressure on the oscillating mirrors. The steady-state amplitude of the optical field and mechanical modes in the cavity and squeezing properties of the mechanical modes are investigated. Results show that the steady-state amplitude increases with the increasing of driving power. The mechanical modes can be squeezed in a large range of parameters, and the squeezing can be enhanced by increasing the cubic nonlinearity strength and power of the driving laser, or adjusting appropriately the frequency detuning between the driving field and cavity field. The squeezing is robust to thermal phonon noise.