We have developed a one-dimensional simulation code for laser shock processing with an atomic model code, an equation of state code, and a laser ablation peening code, in order to calculate laser-plume interactions during laser shock processing. We calculated the temporal changes of some energy ratios [e.g., the ratio (α′) of the thermal energy of a plume to an incident laser energy] and physical quantities, such as electron temperature, ion temperature, absorbed laser power density, and plume pressure under various laser parameters at the laser wavelengths of 355, 532, and 1064 nm. In the case of shorter pulse durations less than 10 ns, a peak plume pressure can be predicted by using α′ of ∼0.25 for 1064 nm and ∼0.40 for 355 and 532 nm below the power density threshold, at which plume pressures start to saturate. These values of α′ were consistent with those obtained in the previous experiments. In the case of longer pulse durations more than 10 ns, α′ for 1064 nm increased up to ∼0.45 at 15 GW/cm² and an enhanced plume pressure would generate due to plasma absorption via inverse bremsstrahlung absorption in the partially ionized region far from the initial surface of the metal and due to heat conduction of the thermal energy of the plume near the initial surface of the metal. Thus, we showed the validity of our one-dimensional simulation code for laser shock processing and will investigate laser-plume interactions using double pulses during laser shock processing in the future.

中文翻译：

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使用激光冲击处理的一维模拟代码模拟激光波长、脉冲持续时间和功率密度对羽流压力产生的影响

我们开发了激光冲击加工的一维仿真代码，包括原子模型代码、状态方程代码和激光烧蚀喷丸代码，以计算激光冲击加工过程中的激光-羽流相互作用。我们计算了一些能量比[例如，羽流的热能与入射激光能量的比值 ( α' )] 和物理量的时间变化，例如电子温度、离子温度、吸收的激光功率密度和羽流355、532 和 1064 nm 激光波长下各种激光参数下的压力。在小于 10 ns 的较短脉冲持续时间的情况下，可以使用α'预测峰值羽流压力1064 nm 为 ~0.25，355 和 532 nm 为 ~0.40，低于功率密度阈值，此时羽流压力开始饱和。这些α'值与先前实验中获得的值一致。在超过 10 ns 的更长脉冲持续时间的情况下，1064 nm 的α'在 15 GW/cm ^{2 时}增加到~0.45并且由于在远离金属初始表面的部分电离区域中通过逆韧致辐射吸收的等离子体吸收以及由于靠近金属初始表面的羽流热能的热传导，将产生增强的羽流压力。因此，我们展示了我们的激光冲击加工一维模拟代码的有效性，并将在未来激光冲击加工过程中使用双脉冲研究激光-羽流相互作用。