光机械谐振腔的受迫振荡和自激振荡
Forced and self-excited oscillations of an optomechanical cavity
摘要：
我们实验研究强迫和自振荡的光机械腔之间形成的光纤布拉格光栅，作为一个静态的反射镜和之间的自由悬挂的金属机械谐振器，作为一个移动的反射镜。在小振幅机械振荡域中，我们发现光机耦合表现为机械谐振器的有效谐振频率、阻尼率和三次非线性的变化。此外，在一定的光功率阈值以上，观察到微机械镜的自振荡。实验结果和理论模型之间的比较，我们最近提出了一个很好的协议。比较还表明，占主导地位的光机耦合机制是加热的金属镜由于光吸收。
英文摘要：
We experimentally study forced and self oscillations of an optomechanical cavity which is formed between a fiber Bragg grating that serves as a static mirror and between a freely suspended metallic mechanical resonator that serves as a moving mirror. In the domain of small amplitude mechanical oscillations, we find that the optomechanical coupling is manifested as changes in the effective resonance frequency, damping rate and cubic nonlinearity of the mechanical resonator. Moreover, self oscillations of the micromechanical mirror are observed above a certain optical power threshold. A comparison between the experimental results and a theoretical model that we have recently presented yields a good agreement. The comparison also indicates that the dominant optomechanical coupling mechanism is the heating of the metallic mirror due to optical absorption.
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