微杠杆干涉检测中的负反作用噪声
Negative Backaction Noise in Interferometric Detection of a Microlever
摘要：
反射镜位移的干涉检测本质上受到激光散粒噪声的限制。然而，在实践中，它往往受到热噪声的限制。在这里，我们报告在液氦温度下进行的实验，以克服热噪声的限制，并调查经典的激光噪声的影响，形成一个法布里-珀罗腔与光纤的微杠杆。频谱噪声密度示出了接近谐振频率的反作用噪声的负贡献区域。我们解释这种噪声降低作为一个相干耦合的微杠杆的激光强度噪声。这种光学机械效应可以用于提高检测灵敏度，如在超出标准量子极限的提案中所讨论的。
英文摘要：
Interferometric detection of mirror displacements is intrinsically limited by laser shot noise. In practice, however, it is often limited by thermal noise. Here we report on an experiment performed at the liquid helium temperature to overcome the thermal noise limitation and investigate the effect of classical laser noise on a microlever that forms a Fabry-Perot cavity with an optical fiber. The spectral noise densities show a region of negative contribution of the backaction noise close to the resonance frequency. We interpret this noise reduction as a coherent coupling of the microlever to the laser intensity noise. This optomechanical effect could be used to improve the detection sensitivity as discussed in proposals going beyond the Standard Quantum Limit.
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