Tyszka Krzysztof, Dobosz Marek
Institute of Metrology and Biomedical Engineering, Warsaw University of Technology, Św. A. Boboli 8, 02-525 Warsaw, Poland.
Rev Sci Instrum. 2018 Aug;89(8):085121. doi: 10.1063/1.5036591.
To increase the laser beam pointing stability required for precise interferometric measurements, we designed an active laser beam angular stabilization system. We used two recently proposed techniques: an interferometric measurement method of laser beam angular deflection which allows compact sensor design and a double wedge-prism beam deflector for precise laser beam steering. Our system provides long-term angular stabilization independently in the horizontal and the vertical planes, providing a hundredfold reduction of the output beam deviations. First, we describe the compact sensor setup with a new measurement algorithm prepared specifically for our stabilization system. Then, the system is introduced, and experimental evaluation is described. The test results show a good performance for the proposed design. We reached a reduction in beam angular deviations amplitude down to 100 nrad/h (in terms of double standard deviation of beam fluctuations).
为提高精确干涉测量所需的激光束指向稳定性，我们设计了一种有源激光束角度稳定系统。我们采用了两种最近提出的技术：一种激光束角偏转干涉测量方法，它允许设计紧凑的传感器；以及一种用于精确激光束转向的双楔形棱镜光束偏转器。我们的系统在水平和垂直平面上独立提供长期角度稳定，使输出光束偏差降低到百分之一。首先，我们描述了紧凑的传感器设置以及专门为我们的稳定系统准备的新测量算法。然后，介绍了该系统，并描述了实验评估。测试结果表明所提出的设计具有良好的性能。我们将光束角偏差幅度降低到了100纳拉德/小时（以光束波动的双标准偏差计）。
