摘要
依据激光光束理论和典型参数,利用数学软件Mathcad14,研究激光武器共轴和离轴扩束体制下全光路和拼接合成四种组合的双波束非相干合成光束传输特性。结果表明,采用卡塞格伦望远镜系统实现激光扩束和聚焦发射,系统几何光学倍率越大最大聚焦距离越远,但一般难以实现无穷远聚焦,且根据聚焦距离与相应束腰大小和远场发散角的变化关系可定义"光束准直"和"功率聚焦"两种调焦模式;全光路合成可有效提高到靶功率密度,而拼接合成虽可提高到靶总功率,但要提高到靶功率密度,需要所有光束均能独立控制出射方向,并能跟随目标距离变化,以便重叠聚焦在目标上;离轴扩束-全光路合成方式可实现紧凑的系统设计,减少光束遮挡,但需要考虑离轴入射所带来的子午面和弧矢面上的焦距差异对光束传输和聚焦特性的影响。
The two-beam non-coherent combining propagation characteristics of laser weapons were investigated computationally using the software Mathcad14 based on laser beam theory and typical parameters for four configurations concerning the all-path and parallel combining and the coaxial and off-axis beam expansion. It was found that to realize laser beam expansion and focusing emission using Cassegrain Telescope system,the ＂beam collimation＂and ＂power focusing＂modes could be defined according to the variation relations among the focusing distance,beam waist size and far-field beam divergence,with the maximum focusing distance increasing with the geometric optical magnification and the infinity focusing being hardly achievable. The results also indicated that the all-path beam combining could enhance effectively the on target power intensity,while the parallel beam combining could increase the on target total power but to obtain increased power intensity would require all beams to be independently directional controlled,following the distance variation of the target,in order to focus in an overlapping manner onto the target. The configuration of off-axis expansion system in association with the all-path combining could provide a compact system design with little structural beam blocking,but the influence to the beam propagation and focusing resulted from the focal length discrepancy in the meridian and sagittal planes due to off-axis incidence might be taken into consideration.
作者
曹秋生
CAO Qiu-sheng(The 27th Research Institute of CETC, Zhengzhou 450047, Chin)
出处
《中国电子科学研究院学报》
北大核心
2018年第2期140-148,共9页
Journal of China Academy of Electronics and Information Technology
关键词
非相干合成
全光路合成
拼接合成
共轴扩束
离轴扩束
聚焦发射
non-coherent combining
all-path combining
parallel combining
coaxial beam expansion
off-axis beam expansion
focusing emission
