The evolution of dense plasmas prior to the arrival of the peak of the laser irradiation is critical to understanding relativistic laser plasma interactions. The spectral properties of a reflected laser pulse after the interaction with a plasma can be used to gain insights about the interaction itself, whereas the effect of holeboring has a predominant role. Here we developed an analytical model, describing the non-relativistic temporal evolution of the holeboring velocity in the presence of an arbitrary overdense plasma density and laser intensity profile. We verify this using two-dimensional particle-in-cell simulations, showing a major influence on the holeboring dynamic depending on the density profile. The influence on the reflected laser pulse has been verified during an experiment at the PHELIX laser. We show that this enables the possibility to determine the sub-micrometer scale length of the preplasma by measuring the maximum holeboring velocity and acceleration during the laser-plasma interaction.

在激光辐照峰值到达之前致密等离子体的演化对于理解相对论激光等离子体相互作用至关重要。与等离子体相互作用后反射激光脉冲的光谱特性可用于深入了解相互作用本身，而钻孔的影响起主要作用。在这里，我们开发了一个分析模型，描述了在任意高密度等离子体密度和激光强度分布的情况下钻孔速度的非相对论时间演变。我们使用二维粒子在细胞模拟中验证了这一点，显示了根据密度分布对钻孔动力学的主要影响。在 PHELIX 激光器的实验中验证了对反射激光脉冲的影响。