反正弦型编码成像系统的极限激光防护能力研究  

Limit of Laser Protection Capability of Arcsine Coded Imaging System

作　　者：李仰亮 吴云龙 叶庆 魏冰妍 罗皓琦 孙可 张昊 张文启 孙晓泉 Li Yangliang;Wu Yunlong;Ye Qing;Wei Bingyan;Luo Haoqi;Sun Ke;Zhang Hao;Zhang Wenqi;Sun Xiaoquan(State Key Laboratory of Pulsed Power Laser Technology,National University of Defense Technology,Hefei 230037,Anhui,China;Advanced Laser Technology Laboratory of Anhui Province,Hefei 230037,Anhui,China;School of Physical Science and Technology,Northwestern Polytechnical University,Xi'an 710129,Shaanxi,China;School of Noncommissioned Officers,Army Academy of Armored Forces,Changchun,130000,Jilin,China)

机构地区：[1]国防科技大学脉冲功率激光技术国家重点实验室,安徽合肥230037 [2]先进激光技术安徽省实验室,安徽合肥230037 [3]西北工业大学物理科学与技术学院,陕西西安710129 [4]陆军装甲兵学院士官学校,吉林长春130000

出　　处：《光学学报》2024年第10期355-365,共11页Acta Optica Sinica

基　　金：基础加强计划技术领域基金(2021-JCJQ-JJ-0284,2022-JCJQ-JJ-0237);中国空间技术研究院CAST创新基金(1020J20210117);国防科技大学校科研计划项目(ZK20-41);先进激光技术安徽省实验室基金(AHL2021QN03,AHL2022ZR03)。

摘　　要：常规成像系统的焦平面结构决定其具有极高的光学增益和有限的焦深范围,导致系统高成像质量与弱激光防护能力的矛盾性问题。波前编码成像技术具有大焦深特点和光场调控作用,通过像面离焦能够在保证成像质量的前提下有效提升系统的激光防护性能。研究波前编码成像系统成像质量和激光防护性能的权衡问题,分析系统激光防护性能的极限至关重要。以反正弦型相位掩模板为例,分别建立离焦波前编码成像系统的成像模型和激光传输模型,研究系统的成像质量和激光防护性能随离焦参数的变化规律。通过解耦方式将系统的成像质量作为基本约束条件,引入定量评价指标得到系统允许的最大离焦参数为9.70λ(λ为波长),并在此基础上评估系统的极限激光防护性能。结果表明,在该条件下系统的最大单像素接收功率的降幅达到96.37%,回波探测器接收功率降至0.217‰,成像系统的抗激光损伤和反激光主动探测性能分别提升一个和三个数量级以上。Objective Traditional imaging systems,due to their focal plane structure,exhibit significant optical gain but have a limited depth of focus.This creates a paradoxical scenario:achieving high image quality comes at the expense of weak laser protection capabilities.Established methods for laser protection in optoelectronic imaging systems encounter challenges including reliance on prior knowledge,bandwidth limitations,and degraded image quality.To address the conflict between image quality and laser protection,researchers utilize wavefront coding technology,leveraging its deep focus characteristics and light field regulation.This enables defocusing the image plane to enhance the system s laser protection capacity without compromising image quality.While wavefront coding can achieve a balance,previous studies have placed excessive focus on how defocus affects laser protection,overlooking its consequential impact on image quality and essentially ignoring how image quality can restrict laser protection.Therefore,investigating the balance between laser protection capability and image quality in wavefront coded imaging systems,as well as understanding the limits of the system s laser protection,is of utmost importance.We aim to examine this balance within the context of the arcsine wavefront coded imaging system and discern the limits of its laser protection capabilities.Methods Using the arcsine phase mask(ASPM)as an exemplar,we build imaging and laser transmission models for a defocused wavefront coding system.The trends are investigated in image quality and laser protection as the defocus parameters shift.By employing a decoupling approach,we take the system s image quality as a fundamental constraint.To ascertain the system s maximum permissible defocus parameters,we introduce quantitative evaluation metrics.Furthermore,our study assesses the system s laser protection capability based on these parameters,providing insights into the protection limits of wavefront coded imaging system.Results and Discussions Numerical

关 键 词：波前编码 成像系统 激光防护 成像质量 

分 类 号：TN977[电子电信—信号与信息处理]