Liu Chien-Sheng, Tsai Chih-Hao
Department of Mechanical Engineering, National Cheng Kung University, No. 1, University Road, Tainan City 70101, Taiwan.
Rev Sci Instrum. 2022 Apr 1;93(4):045002. doi: 10.1063/5.0080069.
In this study, an innovative four-degree-of-freedom (4-DOF) compensation prism is designed for fast steering mirror active laser compensation systems. In addition to improving the disadvantages of the commercially available compensation systems, such as a larger number of components and longer optical paths, the proposed system has further enhanced the shortcoming of high sensitivity to the laser by using double Porro prisms as 4-DOF compensation prisms proposed in a previous study. The prism proposed in this study reduces the sensitivity to the laser while maintaining two translations and two rotations in 4-DOF control characteristic for laser, thereby improving the resolution of the system to control the laser. First, Zemax was used to build the overall system and evaluate the system characteristics. Then, the skew-ray tracing method and homogeneous coordinate transformation matrix were used to build the mathematical model of the compensation prism and analyze the sensitivity of the proposed prism to the laser. Finally, the closed-loop algorithm was established and the system was completely built on the optical table for experiments to compare the results between the laser before and after compensation by the proposed prism. In addition, the resolution of the proposed prism is compared with the double Porro prisms.
在本研究中，为快速转向镜有源激光补偿系统设计了一种创新的四自由度（4-DOF）补偿棱镜。除了改善市售补偿系统的缺点，如部件数量较多和光路较长外，所提出的系统还通过使用先前研究中提出的双普罗棱镜作为4-DOF补偿棱镜，进一步改善了对激光高灵敏度这一缺点。本研究提出的棱镜在保持激光4-DOF控制特性中的两个平移和两个旋转的同时，降低了对激光的灵敏度，从而提高了系统控制激光的分辨率。首先，使用Zemax构建整个系统并评估系统特性。然后，使用斜光线追迹方法和齐次坐标变换矩阵构建补偿棱镜的数学模型，并分析所提出棱镜对激光的灵敏度。最后，建立闭环算法，并在光学平台上完全搭建系统进行实验，以比较所提出棱镜补偿前后激光的结果。此外，将所提出棱镜的分辨率与双普罗棱镜进行比较。
