Knudsen Einar, Perchoux Julien, Mazoyer Thierry, Imas José Javier, Veng Mengkoung, Jayat Francis, Tronche Clément, Bosch Thierry
Appl Opt. 2021 Jan 1;60(1):119-124. doi: 10.1364/AO.411103.
It is established in the optical feedback interferometry (OFI) theory that the shape of the interferometric fringe has an impact on the detector's response to very small displacement measurements. In this paper, we validate-for the first time, to the best of our knowledge, based on experimental results-this statement by comparing experiments to an established model implementation. Through these experiments, we show that the amplitude of the signals induced by sub-/2 optical path variations is linearly dependent on the slope of the underlying fringe. Thus, careful control of the phase allows us to maximize the detection amplitude of very small displacements by positioning the phase where the fringe slope is the steepest. These results are directly applicable to established OFI applications that measure sub-/2 optical path variations, such as OFI vibrometers or acoustic imaging though the acousto-optic effect.
光学反馈干涉测量法（OFI）理论表明，干涉条纹的形状会影响探测器对非常小的位移测量的响应。在本文中，据我们所知，我们首次基于实验结果，通过将实验与已建立的模型实现进行比较来验证这一说法。通过这些实验，我们表明，由小于/2光程变化引起的信号幅度与基础条纹的斜率呈线性相关。因此，仔细控制相位使我们能够通过将相位定位在条纹斜率最陡的位置来最大化非常小位移的检测幅度。这些结果直接适用于测量小于/2光程变化的现有OFI应用，例如OFI振动计或通过声光效应进行的声学成像。
