激光武器变焦发射系统远场光斑尺寸最小化研究与实现  

Research and Realization of the Minimized Far-Field Spot Size of Laser Weapons Variable-Focus Emission System

作　　者：张宁华 严毅[1] 穆学桢[1] 谢光辉[1] Zhang Ninghua;Yan Yi;Mu Xuezhen;Xie Guanghui(China Airborne Missile Academy,Luoyang 471009,China)

机构地区：[1]中国空空导弹研究院,河南洛阳471009

出　　处：《航空兵器》2021年第1期55-59,共5页Aero Weaponry

摘　　要：辐照功率密度足够强是激光武器对目标造成有效杀伤的重要前提。在激光输出功率有限的情况下,为了满足这一要求,就需对辐照光斑尺寸进行评估优化。本文以卡塞格伦共轴变焦发射系统为模型,基于高斯光束的传输理论,计算了目标位置处光斑尺寸与发射系统各参数间的一般规律,并利用MATLAB软件对典型发射系统进行仿真分析。结果表明,将激光束聚焦于目标位置时,光斑尺寸并不是最小的,而是将光束聚焦于目标位置前,发散到目标上的光斑尺寸最小。在此基础上,推导了发射系统离焦量满足的关系式,结果显示,离焦量与目标位置成反比,与主发射镜焦距的平方成正比,与发射激光束的参数无关。本文研究内容对发射系统快速调整,实现最小光斑辐照并毁伤目标具有重要的实际指导意义。The sufficient irradiation power density is an important prerequisite for laser weapons to cause effective damage to targets.It is necessary to evaluate and optimize the irradiation spot size in order to satisfy the requirements under the situation of the limited laser output power.Based on the model of Cassegrain co-axial variable-focus emission system and the transmission theory of Gaussian beam,the general rule between the spot size at the target position and the parameters of the emission system is calculated.Meanwhile,the typical emission system is simulated and analyzed with MATLAB software.The results show that the spot size is not the minimum value when the laser beam is focused on the target.Instead,when the laser beam is focused on a certain position before the target,the spot size diverging to the target is the minimum value.Based on this,the formula for the defocusing amount is derived.The results reflect that the defocusing amount is inversely proportional to the target position,proportional to the square of the focal length of the main mirror,and it is independent of parameters of emission laser beam.The research has the important practice significance for the quick adjustment of the emission system and the realization of the minimum irradiation spot size and the destruction of the target.

关 键 词：激光武器 高斯光束 变焦系统 离焦量 光斑尺寸 

分 类 号：TJ95[兵器科学与技术—武器系统与运用工程]