基于快速反射镜的光束指向性偏差矫正系统  

Beam Pointing Deviation Correction System Based on Fast Steering Mirrors

作　　者：任行飞 范晋伟[1] 潘日 孙锟 Ren Xingfei;Fan Jinwei;Pan Ri;Sun Kun(Institute of CNC Precision Machining Technology,Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学材料与制造学部数控精密加工技术研究所,北京100124

出　　处：《中国激光》2023年第14期150-159,共10页Chinese Journal of Lasers

基　　金：2021年产业技术基础公共服务平台项目(2021-0171-1-1);国家重点研发计划(2018YFB1107502)。

摘　　要：激光具备优异的相干性、方向性和高能量,被广泛应用于激光通信、激光制导、高能武器和精密加工等领域。然而,激光器本身和外部环境等因素会造成光束指向不稳定,严重降低了通信、制导和加工的精度。因此,构建了一种基于快速反射镜的光束指向性偏差矫正系统,并对光束指向性偏差矫正过程进行建模。重点构建了由位置敏感探测器的位置偏差信号到快速反射镜的矫正角度的控制模型。建立的控制模型可以实现对光束指向性偏差的检测和预测,并调整快速反射镜的姿态,以矫正光束指向性偏差,提高光束指向稳定性。通过实验验证了构建的系统和模型的性能。结果表明,依据构建的系统和模型校正后的光束在X方向和Y方向上的指向性偏差分别减少了78.08%和70.28%,光束指向稳定性显著提升。Objective Laser technology has gained widespread applications in various fields,such as communication,guidance,and precision machining.However,the accuracy of these applications is often compromised by beam pointing instability caused by uneven internal laser temperature and external environmental changes.Traditional methods of improving beam pointing stability,including using materials with low thermal expansion coefficients,adopting cooling systems and deformation mirrors,and reducing vibration,have proven to be limited in their effectiveness.More advanced lasers have internal beam pointing correction systems,but their performance is limited by their size,and they cannot correct pointing deviations caused by external factors.In view of these limitations,the use of an external beam pointing deviation correction system has emerged as a promising solution.The beam pointing deviation correction system based on fast steering mirrors(FSMs) is considered to be the most mature and effective approach.However,the Z-shaped beam path commonly used in these systems changes the propagation direction of the original beam,resulting in poor expansion performance.In this paper,we present a U-shaped beam pointing deviation correction system based on FSMs that does not change the original beam propagation direction.The system is modeled using geometric optics,including the mapping model from FSMs to four-term beam pointing deviations and the FSMs control model.To further enhance the system? s performance,we propose a predictive control model,simplifying the model operation and improving the system responsiveness.Our results demonstrate that the constructed system exhibits excellent beam pointing deviation correction performance.Methods The beam pointing deviation correction system consists of three main components:detector,controller,and actuator.The detector consists of a uniform beam splitter and two vertically distributed high-accuracy position-sensitive detectors(PSDs).The non-uniform beam splitter diverts a small portion of t

关 键 词：光学设计 激光束传输 光路建模 光束指向性偏差 快速反射镜 位置敏感探测器 

分 类 号：O439[机械工程—光学工程]