The selective modification of upper layers of a Ni/Al multilayer nanostructure irradiated by a single femtosecond laser pulse has been studied. The analysis of surface topography indicates that either partial or complete removal of two upper layers is possible depending on the absorbed energy. The surface has been scanned by an atomic force microscope. The numerical simulation of the phenomenon with a two-temperature hydrodynamic code has revealed an asynchronous dynamics of the electron subsystems of Ni and Al and an inhomogeneous heating of ion subsystems. As a result, a complex combination of compression and rarefaction waves is initiated in the multilayer target. It has been shown numerically that, as the absorbed energy increases, the first nickel layer is initially ruptured because of the localization of tensile stresses. The experimental and numerical thicknesses of the separated layer and the threshold energy are in agreement with each other. Consequently, the parameters of two-temperature models of nickel and aluminum are selected correctly.

研究了单飞秒激光脉冲对Ni / Al多层纳米结构上层的选择性改性。表面形貌分析表明，取决于吸收的能量，可以部分或完全去除两个上层。表面已通过原子力显微镜扫描。用双温度流体力学代码对该现象进行了数值模拟，结果表明，Ni和Al电子子系统的动力学是异步的，而离子子系统的加热是不均匀的。结果，在多层靶中引发了压缩波和稀疏波的复杂组合。从数值上表明，随着吸收能量的增加，第一镍层由于拉应力的局部化而首先破裂。分离层的实验厚度和数值厚度以及阈值能量彼此一致。因此，正确选择了镍和铝两种温度模型的参数。