1 上海航天控制技术研究所，上海 201109
2 天津大学 精密仪器与光电子工程学院，天津 300072
为解决高速目标强尾焰弱本体精确探测问题，设计了单脉冲式激光玫瑰扫描系统。针对时间响应需求，设计高峰值功率和微小激光束散角，实现主动激光高空4 km以上的远距离探测，同时为弥补束散角不足，设计高动态压电式扫描机构行程以扩大激光探测视场达2°（1°行程）以上，并研究高速脉冲频率和扫描轨迹算法，评估目标在扫描投影视场内张角以及激光脉冲点张角的密度和均匀度，达到不低于1000 Hz的扫描闭环带宽和50 Hz的视场刷新率，实现高速目标单次视场刷新下100%的探测概率反馈，突破极限探测条件下（迎头或尾追）可探测区域占比55%以上，完成目标真实位置、角度回告，达到了精确瞄准目标本体的目的，验证了高速目标探测的可实现性，对高速目标末端精确探测的应用具有重要的意义。
脉冲扫描 高速探测 本体识别 探测效率 pulse scanning high-speed detection body recognition detection efficiency 红外与激光工程
2023, 52(9): 20220916
天津大学精密仪器与光电子工程学院光电信息技术教育部重点实验室, 天津 300072
采用半经典回碰模型(semiclassical rescattering model, SRM)和含时薛定谔方程(time-dependent Schr?dinger equation, TDSE),对线偏振激光场中氢原子的蜘蛛型光电子动量谱进行了数值模拟,重点研究了散射振幅相位的提取。基于前人的研究成果,依据SRM理论和鞍点理论,得到时间参数近似相等的结论,并提出了一种相位提取的新方法。构建了两个一级近似公式,解析表达了散射振幅相位。由所提方法获得的相位与纵向动量和横向动量有关。新方法尽管增加了计算量,但是相位提取精度有显著提高。
原子与分子物理学 原子光电离 氢原子 强场光电子全息 数值模拟 光学学报
2021, 41(10): 1002001
Author Affiliations
Abstract
College of Precision Instrument and Optoelectronics Engineering, Tianjin University; Key Laboratory of Optoelectronic Information Technology, Ministry of Education, Tianjin 300072, China
The spiderlike structures in the photoelectron momentum distributions of ionized electrons from the hydrogen atom are numerically simulated by using a semiclassical rescattering model (SRM) and solving the time-dependent Schr?dinger equation (TDSE), focusing on the role of the phase of the scattering amplitude. With the SRM, we find that the spiderlike legs shift to positions with smaller transverse momentum values while increasing the phase. The spiderlike patterns obtained by SRM and TDSE are in good agreement upon considering this phase. In addition, the time differences in electron ionization and rescattering calculated by SRM and the saddle-point equations are either in agreement or show very similar laws of variation, which further corroborates the significance of the phase of the scattering amplitude.
photoelectron holography semiclassical rescattering model spiderlike structure Chinese Optics Letters
2021, 19(7): 073201
