Abstract: Second harmonics intensity and spectra, emitted from solid Al target heated by obliquely incident p-polarized 1.5 ps Nd-laser pulse, are interpreted in the frame of 1D hydrodynamics model including resonance absorption, fast electron generation and transport and acceleration of ions. Second harmonics spectra reveal blue shift for laser intensity 10$+16$/ W/cm$+2$/, while red shift is observed for laser intensity 10$+17$/ W/cm$+2$/. It corresponds to a qualitative difference in the critical surface dynamic is observed in simulations. A good agreement of simulation result with experiment is observed for the lower intensity while possible explanations of certain discrepancies for the higher intensity are proposed. !8
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机译：摘要：在1D流体动力学模型的框架内，解释了由斜入射的p极化1.5 ps Nd激光脉冲加热的固体Al目标发射的二次谐波强度和光谱，包括共振吸收，快速电子产生以及离子的迁移和加速。二次谐波光谱显示激光强度10 $ + 16 $ / W / cm $ + 2 $ /的蓝移，而激光强度10 $ + 17 $ / W / cm $ + 2 $ /的红移被观察到。它对应于在仿真中观察到的临界表面动力学的定性差异。对于较低的强度，观察到模拟结果与实验的良好一致性，同时提出了对较高强度的某些差异的可能解释。 ！8
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