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“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。
The “thermal imaging” effect is one of the bottlenecks that restrict the safe operation of high power laser systems, especially the inertial confinement fusion fusion (ICF) laser drivers and the improvement of output power. Under certain conditions, while some systems often operate below a typical damage threshold power, some optical components can also suffer unexpected damage due to the “thermal imaging” effect. In this paper, the recent progresses on “thermography” effect are summarized, including diffraction theory model formed by “thermal imaging”, analytical theoretical analysis under sheet approximation, laser The evolution of “heat image”, the characteristics of multi-scattering dots forming “heat image” and the suppression of “heat image” effect. At last, it points out the problems that need to be further solved theoretically and experimentally.