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通过分析激光聚变中近背向散射光的收集方式,提出了采用漫反射板收集近背向散射光的方法。通过对漫反射板的应用场景分析,提出了需要研究的漫反射板特性,并搭建了漫反射板特性测量装置。测量并分析了漫反射板的方向半球反射比、双向反射分布函数、面均匀性、真空特性和紫外特性。分析结果表明:F4目标板具有接近于0.99的高反射率,光谱平坦性,近似余弦分布的双向反射分布函数,较高的面均匀性,以及较小的紫外真空影响。因此,F4目标板满足激光惯性约束聚变中近背向散射光的测量需求,采用漫反射板收集近背向散射光的方法可行。
By analyzing the collection mode of near-backscattered light in laser fusion, a method of collecting near-backscattered light using diffuse reflectors is proposed. By analyzing the application scene of diffuse reflectors, the properties of diffuse reflectors to be studied are put forward, and the device for measuring the characteristics of diffuse reflectors is set up. The hemispherical reflectance, birefringence distribution, surface uniformity, vacuum characteristics and UV characteristics of diffuse reflectors were measured and analyzed. The results show that the F4 target has a high reflectivity close to 0.99, spectral flatness, birefringence distribution function with approximate cosine distribution, high surface uniformity, and small UV vacuum effect. Therefore, the F4 target plate meets the measurement requirements of near-backscattered light in laser inertial confinement fusion, and the method of collecting near-backscattered light with a diffuse reflector is feasible.