Department of Physics, Stockholm University, AlbaNova, SE-106 91 Stockholm, Sweden.
Phys Rev Lett. 2010 Feb 5;104(5):050801. doi: 10.1103/PhysRevLett.104.050801.
We describe a method of analysis which allows for reconstructing the nonlinear disturbance of a high Q harmonic oscillator. When the oscillator is driven with two or more frequencies, the nonlinearity causes intermodulation of the drives, resulting in a complicated spectral response. Analysis of this spectrum allows one to approximate the nonlinearity. The method, which is generally applicable to measurements based on resonant detection, increases the information content of the measurement without requiring a large detection bandwidth, and optimally uses the enhanced sensitivity near resonance to extract information and minimize error due to detector noise.
我们描述了一种分析方法，该方法可用于重建高 Q 谐波振荡器的非线性干扰。当振荡器受到两个或更多频率的驱动时，非线性会导致驱动器的互调，从而产生复杂的光谱响应。对该光谱的分析可用于逼近非线性。该方法通常适用于基于谐振检测的测量，它在不要求大的检测带宽的情况下增加了测量的信息量，并在共振附近利用增强的灵敏度来提取信息并最小化由于探测器噪声引起的误差。
