Processes using laser-shock applications, such as Laser Shock Peening or Laser Stripping require a deep understanding of both mechanical and thermal loading applied. We hereby present new experimental measurements of the plasma pressure release regarding its initial dimension, which depends on the laser beam size. Our data were obtained through shock waves’ velocity analysis and radiometric assessments. A new model to describe the adiabatic release behavior of a laser-induced plasma with a dependency to the beam size is developed. The results and the associated model exhibit that the plasma release duration is shortened with smaller laser spots. As a consequence, with chosen smaller laser spots (0.6 mm to 1 mm), the thermal loading applied during the plasma lifetime will also decrease. These new results shall help for a better understanding of laser-matter interaction for laser-shock applications by giving more accurate plasma profiles. Thus, process simulations can be improved as well. Eventually, by considering recent developments with high-power Diode Pumped Solid-State lasers (DPSS), we now expect to develop a new configuration for LSP which could be applicable both without any thermal coating and deliverable by an optical fiber.

使用激光冲击应用程序的过程，例如激光冲击喷丸或激光剥离，需要对施加的机械和热负荷有深刻的了解。在此，我们就等离子体压力释放的初始尺寸提出了新的实验测量方法，该尺寸取决于激光束的大小。我们的数据是通过冲击波的速度分析和辐射评估获得的。建立了一个新模型来描述激光诱导等离子体的绝热释放行为，该行为与光束大小有关。结果和相关模型表明，使用较小的激光光斑可以缩短血浆释放时间。结果，使用选定的较小激光斑（0.6毫米至1毫米），在等离子体寿命期间施加的热负荷也会减少。这些新结果将通过给出更准确的等离子体轮廓，帮助更好地了解激光冲击应用中的激光物质相互作用。因此，也可以改善过程仿真。最终，考虑到高功率二极管泵浦固态激光器（DPSS）的最新发展，我们现在期望为LSP开发一种新的配置，该配置可以在没有任何热涂层的情况下适用，并且可以通过光纤传输。