序列脉冲激光由地面斜入射空中的热晕效应研究  

Thermal Blooming of repetitively pulsed Laser Propagation from Ground to Air

作　　者：刘伟[1] 廖天河[1] 高穹[2] 

机构地区：[1]信息工程大学理学院数理系,郑州450001 [2]国防科技大学光电科学与工程学院,长沙410073

出　　处：《河南师范大学学报（自然科学版）》2012年第4期46-50,共5页Journal of Henan Normal University(Natural Science Edition)

基　　金：863计划资助项目;湖南省研究生科研创新项目(CX2009B005)

摘　　要：当强激光在地面以不同天顶角向空中传输时,大气的吸收系数不是常数,利用大气中吸收系数随高度变化的函数,通过内插法得到了中纬度夏季时一定海拔高度下大气的吸收系数,建立了序列脉冲激光在地对空传输的热晕模型.分析了强激光以不同天顶角入射对热晕效应的影响.数值结果表明:当高斯激光束传输同样距离,其他条件不变时,天顶角减小,重心沿逆风偏移程度减弱,峰值光强和桶中功率增大,光束聚焦能力增强,热晕效应减弱;当激光沿海平面水平传输时,热晕效应最强烈.Considering the variety of absorption coefficient along with different altitudes in different incident angles from ground to air, this paper gets the absorption coefficient in the mid-latitude region by interpolation, sets up the model of thermal blooming of repetitively pulsed laser from ground to air, and analyzes thermal blooming by four-dimensional computer code. What is more, the paper simulates the model in five zenith angles in summer. The results are as follows： Thermal blooming that the zenith angle is zero is the least serious. The zenith angle is more smaller, the motion of the peak at the horizontal axis is less farther, PIB and the peak power is much bigger, the focusing ability increases, thermal blooming is less serious.

关 键 词：热晕 序列脉冲 内插法 吸收系数 天顶角 数值模拟 

分 类 号：TN012[电子电信—物理电子学]