Zhang Qi, Hu Qili, Wang Hongyan, Hu Ming, Xu Xingyu, Wu Jingjing, Hu Lifa
Opt Express. 2023 Jul 31;31(16):25900-25914. doi: 10.1364/OE.497914.
Thermal blooming (TB) is one of the important factors affecting the quality of high-energy laser beams. Reasonable simulation of thermal blooming is important to the application of a high-energy laser. However, reported investigations on TB simulation are mainly based on one method, such as the perturbation method or the phase screen method, which often leads to obvious errors in some conditions. In the paper, the reasonable ranges of optical generalized distortion parameters for both methods are determined based on the reported experimental data, which solves the problem of accurate TB simulations for the first time. In addition, the dynamic effect of thermal blooming is also calculated. Finally, the formula method is presented to extract the phase of thermal blooming distortion. We then use LC-SLM (Liquid crystal spatial light modulator) to emulate thermal blooming effect in the lab. The experimental results are more consistent with the numerical simulation results than conventional phase extraction methods. Our work provides a quantitatively and programmable way to accurately simulate TB with LC-SLM in the lab.
热晕（TB）是影响高能激光束质量的重要因素之一。对热晕进行合理模拟对于高能激光的应用至关重要。然而，已报道的关于热晕模拟的研究主要基于一种方法，如微扰法或相位屏法，这在某些情况下常常导致明显的误差。在本文中，基于已报道的实验数据确定了这两种方法的光学广义畸变参数的合理范围，首次解决了热晕精确模拟的问题。此外，还计算了热晕的动态效应。最后，提出了提取热晕畸变相位的公式法。然后我们利用液晶空间光调制器（LC-SLM）在实验室中模拟热晕效应。与传统的相位提取方法相比，实验结果与数值模拟结果更加一致。我们的工作提供了一种在实验室中利用LC-SLM精确模拟热晕的定量且可编程的方法。
