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建立了间接驱动过程中激光组束通过透镜在黑腔柱体中传输的模型。利用柯林斯公式,将各个锥环所有激光束投射到腔壁上的所有焦斑光强进行非相干叠加,研究其光强分布。详细分析了空间相干度、透镜聚焦F数、离焦距离对靶壁上焦斑光强分布均匀性的影响。空间相干度增大时,非相干叠加得到的亮斑光强度增大,光强起伏更剧烈,顶部光强分布均匀性变差;增大透镜聚焦F数,焦斑光场增强,光强振荡程度加深,光场分布更不均匀;而离焦量变大时,靶腔壁上的光强度降低,其振荡程度也减弱,光强峰值差值变小,顶部光强分布变得均匀。
The model of laser beam passing through the lens in a black-cavity cylinder during indirect driving is established. Collins formula was used to project all the cone laser beams onto the cavity wall. All the focal spot intensities were non-coherently superposed to study the light intensity distribution. The effects of spatial coherence, lens focal F number and defocus distance on the uniformity of light intensity distribution on the target wall are analyzed in detail. When the spatial coherence increases, the intensity of the spot light obtained by non-coherent stacking increases, the intensity of the light intensity increases more intensely, and the uniformity of the light intensity at the top becomes worse. When the F number of the lens is increased, the light field of the focal spot is enhanced and the light intensity oscillation When the defocus amount becomes larger, the light intensity on the target cavity wall decreases, and the degree of oscillation decreases. The peak value of light intensity becomes smaller and the light intensity distribution becomes uniform at the top.