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在ICF和X光激光产生实验中,要求将入射潦恍变成某种特定空间分布的光束,对靶进行辐照,而且对辐照均匀性有相当高的要求。激光直接驱动ICF是将激光直接辐照在球形DT靶丸上,使燃料达到高温,烧蚀后外喷,由等离子体的反冲作用聚心压缩,内爆点火。激光器直接产生的激光具有很好的相干性和光强分布不均匀性,容易引起内爆过程中流体动力学的不稳定性而破坏靶的球对称。这种不稳定性可能使靶壁和燃料物质混合,而不能达到聚变点火所要求的温度和密度。另外,在激光与物质相互作用的基础物理研究中,如物质的状态方程的研究,也需要入射激光束具有均匀的光强分布,因此,需对激光来进行平滑处理,使其具有很均匀的光强分布和空间非相干性。
In the ICF and X-ray laser generation experiments, it is required to change the incident light into a certain spatial distribution of the beam, the target irradiation, but also the irradiation uniformity is quite high requirements. Laser direct drive ICF is the laser radiation directly on the spherical DT target pellets, the fuel reaches high temperature, ablation after the spray, the recoil by the plasma convergent compression, implosion ignition. The laser produced directly by the laser has good coherence and nonuniform distribution of light intensity, which easily leads to instability of hydrodynamics during implosion and destroys the spherical symmetry of the target. This instability may cause the target wall to mix with the fuel material without reaching the temperatures and densities required for fusion ignition. In addition, in the basic physics of the interaction between laser and matter, such as the study of matter equation of state, it is also required that the incident laser beam has a uniform light intensity distribution. Therefore, the laser needs to be smoothed to have a uniform Light intensity distribution and spatial incoherence.