多束平顶光束在腔内及靶壁的光强分布  

Intensity Distribution of Multi-Flat-Topped Beams in Target and Wall

作　　者：陈明玉[1] 李小燕[1] 陈子阳[1] 蒲继雄[1] 

机构地区：[1]华侨大学信息科学与工程学院福建省光传输与变换重点实验室,福建厦门361021

出　　处：《激光与光电子学进展》2015年第9期203-210,共8页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61178015;11304104)

摘　　要：基于广义惠更斯-菲涅耳衍射积分公式,推导出在激光间接驱动聚变装置腔柱内和腔柱内靶面上相干叠加的多束激光束投影焦斑光强度的解析表达式。着重分析了轴向距离、离焦量、入射角和聚焦F数等因素对投射在腔内部横截面上的光斑光强分布的影响,以及离焦量、入射角、F数和腔径大小对辐照在靶壁上的焦斑光强分布的影响。仿真结果表明,增大离焦量和聚焦F数,辐照在腔柱内靶面上和垂直于腔轴切面上各投影光斑的光强变化变得平缓,且腔靶内表面上的光强分布均匀性变差,且增大聚焦F数或增大离焦量,会使投影焦斑尺寸呈现减小的趋势。在腔壁上要获得均匀性比较好的光斑,跟腔径值和注入角度的选取有比较密切的联系。Based on the generalized Huygens-Fresnel diffraction integral formula, analytical expressions of coherent superposition multiple laser beams projection light focal spots intensity in hohlraum and wall of indirectdriven fusion device is calculated. The effect of the axial distance, defocus amount, incident angle and focusing F number on cavity internal glazing cross-section light spots intensity distribution and the effect defocus amount, incident angle, focusing F number and diameter on hohlraum wall light spots intensity distribution is analyzed. Simulation results show that within a fLxed range, the interference becomes less obvious, and the intensity distribution becomes more uniform with the increasement of defocus amount and F number. In addition, the obtainment of better uniformity of light spots in hohlraum wall is relevant to hohlraum diameter and incident angle.

关 键 词：激光光学 均匀辐照 平顶高斯光束 间接驱动聚变 相干叠加 F数 

分 类 号：O436[机械工程—光学工程] O437[理学—光学]