级联介质系统中多散射点形成热像的数值分析  

Numerical analysis of hot-image caused by multi-scatterers in high-power laser system with cascaded medium

作　　者：叶知隽[1] 赵建林[1] 彭涛[1] 李东[1] 

机构地区：[1]西北工业大学光信息科学与技术研究所陕西省光信息技术重点实验室,西安710072

出　　处：《强激光与粒子束》2008年第9期1421-1425,共5页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(10576023);西北工业大学博士论文创新基金资助课题(CX200714)

摘　　要：以5片带增益损耗的级联介质板为例,数值模拟分析了高功率激光器系统中,由垂轴平面内多个散射点形成热像的演化规律,讨论了散射点参数对散射光之间相互作用的影响。模拟结果表明:无论这些共面的散射点同时或分别单独存在,其形成的热像点亦共面,只是同时存在时对应的热像峰值强度比单独存在时低;当不同参数散射点引起的散射光在从背景光场中提取能量形成热像时,提取能量的竞争并不平等,最终会导致某些散射光在能量竞争中处于优势,最终形成的热像得到加强,而其它散射光形成的热像受到抑制。The evolution of the hot-images caused by multi-scatterers in a plane perpendicular to the axis in high-power laser systems is numerically simulated by taking five parallel equispaeed nonlinear medium plates （with gain and loss） as an example. The influences among the seattered beams with different parameters are analyzed, respectively. The analytical results show that the hot-images induced by coplanar multi-scatterers are also coplanar whether they exist simultaneously or severally, However, the peak intensity of the hot-images is weaker when they exist simultaneously than that when they exist severally. In addition, when the seattered beams with different parameters gain energy from the original beam and form the hot-image, the unequal eompetitions of energy may result in the fact that some of the eorresponding hot-images are relatively enhaneed and others are restrained.

关 键 词：热像 小尺度自聚焦 级联介质系统 激光损伤 

分 类 号：O437.5[机械工程—光学工程]