Kissinger Thomas, Charrett Thomas O H, Tatam Ralph P
Opt Express. 2015 Apr 6;23(7):9415-31. doi: 10.1364/OE.23.009415.
A novel signal processing technique using sinusoidal optical frequency modulation of an inexpensive continuous-wave laser diode source is proposed that allows highly linear interferometric phase measurements in a simple, self-referencing setup. Here, the use of a smooth window function is key to suppress unwanted signal components in the demodulation process. Signals from several interferometers with unequal optical path differences can be multiplexed, and, in contrast to prior work, the optical path differences are continuously variable, greatly increasing the practicality of the scheme. In this paper, the theory of the technique is presented, an experimental implementation using three multiplexed interferometers is demonstrated, and detailed investigations quantifying issues such as linearity and robustness against instrument drift are performed.
提出了一种新颖的信号处理技术，该技术利用廉价的连续波激光二极管源的正弦光频率调制，在简单的自参考设置中实现高度线性的干涉相位测量。在这里，使用平滑窗函数是抑制解调过程中不需要的信号分量的关键。来自几个光程差不相等的干涉仪的信号可以进行复用，并且与先前的工作相比，光程差是连续可变的，大大提高了该方案的实用性。本文介绍了该技术的理论，展示了使用三个复用干涉仪的实验实现，并对诸如线性度和抗仪器漂移的鲁棒性等问题进行了详细研究。
