“热像”效应是制约高功率激光系统,特别是惯性约束核聚变(ICF)激光驱动器安全运行和提高输出功率的瓶颈因素之一。在某些条件下,往往系统运行在典型的损伤阈值功率之下时,某些光学元件也会因为“热像”效应的存在而意外地遭受损伤。总结介绍了近年来关于“热像”效应研究的新进展,包括“热像”形成的衍射理论模型、薄片近似下的解析理论分析结果、厚介质及级联介质情况下激光“热像”的演化规律、多散射点形成“热像”的特点以及“热像”效应的抑制方法等。最后指出理论及实验上尚待进一步解决的问题。

Hot-image effect is one of the key factors limiting the performance and output power of high-power laser systems, especially in inertial confinement fusion (ICF) laser driver systems. Certain optical components are often damaged accidentally due to the presence of hot-image even if the systems are operating at the intensity level below the typical damage threshold when hot-image happens. The research progress on the hot-image effects is summarized, including the diffraction model for hot-image formation, the analytical theory on hot-image in case of thin-sheet approximation, the evolution of the hot-image in cases of thick medium and cascade medium, the characteristics of hot-images caused from multi-scatterers, the restraining methods on hot-images and so on. Finally, some important problems to be solved on hot-image in theory and experiment are also listed.