高速摄影激光照明技术取得新进展

采用衍射型光束匀化器件及多模光纤传光和透镜耦合扩束方法，有效抑制了激光散斑与干涉条纹，解决了大视场平行光束照明时拍摄物体在成像面上的渐晕问题，实现了?300 mm大口径视场下激光均匀照明和目标的清晰成像，并成功用于柱面内爆压缩、空间碎片等精密物理实验研究中。高速摄影技术与激光照明的成功结合，可有效抑制精密物理实验中强烈自发光导致过度曝光从而大大影响成像质量的问题，获得的物理过程边界形貌更加清晰，判读更精确。

New development of laser illumination technology for high-speed photography

In this paper, laser speckle and interference fringe were effectively restrained by the use of diffractive optical element for smoothing beam, multimode fiber and the lens coupling expander technology. The vignette phenomenon on the imaging plane was eliminated while taking the picture of objective illuminated by wide-view parallel-light. Based on this research, the ?300 mm wide-view laser uniform illumination and the clear imaging of objective were realized, and it was successfully used in precise physical experiments of cylindrical implosion compression, space junk and so on. The successful combination of high-speed photography technology and laser illumination will effectively restrain the excessive exposure caused by intensive self-illumination in precise physical experiments, and improve the quality of imaging. Consequently, the image boundary of physical phenomenon will be clearer and easier to interprete and recognize.