论文标题
紧凑型杂项干涉仪中的噪声贡献的研究和缓解
Investigation and mitigation of noise contributions in a compact heterodyne interferometer
论文作者
论文摘要
我们提出了一种噪声估计和减法算法，能够提高异差激光干涉仪的敏感性一个数量级。杂尼干涉仪是专门设计用于测试质量量子惯性传感时测试质量的动态测量的。在将我们的噪声减法算法应用于台式原型算法后，在100MHz处达到100MHz的3.31e-11 m/rthz噪声底，当在3e-5 torr的水平上测试真空时，在100MHz的噪声水平为100MHz。基于先前的结果，我们研究了非线性光路径噪声，激光频率噪声和杂化激光干涉仪中温度波动的噪声估计和减法技术。对于每个噪声源，我们确定了其贡献，并通过线性拟合或光谱分析算法将其从测量中取出。我们在本文中介绍的噪声校正算法通常可以应用于杂化激光干涉仪。
We present a noise estimation and subtraction algorithm capable of increasing the sensitivity of heterodyne laser interferometers by one order of magnitude. The heterodyne interferometer is specially designed for dynamic measurements of a test mass in the application of sub-Hz inertial sensing. A noise floor of 3.31E-11 m/rtHz at 100mHz is achieved after applying our noise subtraction algorithm to a benchtop prototype interferometer that showed a noise level of 2.76E-10 m/rtHz at 100mHz when tested in vacuum at levels of 3E-5 Torr. Based on the previous results, we investigated noise estimation and subtraction techniques of non-linear optical pathlength noise, laser frequency noise, and temperature fluctuations in heterodyne laser interferometers. For each noise source, we identified its contribution and removed it from the measurement by linear fitting or a spectral analysis algorithm. The noise correction algorithm we present in this article can be generally applied to heterodyne laser interferometers.
