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Formation of shock electromagnetic waves during femtosecond pulse propagation in transparent solids

机译：飞秒脉冲在透明固体中传播过程中形成的冲击电磁波

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Abstract: There is considered formation and propagation of shock electromagnetic waves (SEW) of visible spectral range as possible nonlinear optical phenomenon taking place at laser intensities characteristic of femtosecond laser interaction with transparent solids. Main regularities of SHEW formation are studied on the basis of 1D model of plane-wave propagation in isotropic dielectric with nonlinear optical response. Special attention is paid to influence of color dispersion and absorption on SEW formation and propagation. Necessary conditions for appearing of SHEW are obtained, in particular, threshold amplitude is estimated. There is presented a model for numerical simulation of SHEW formation and propagation influenced by dispersion of linear and nonlinear parts of refractive index. Using the simulation, we studied dynamics of SHEW formation on several first optical cycles of femtosecond laser pulse in transparent medium. Important observed features of SHEW of optical frequency are discussed. Obtained results are considered from the viewpoint of experiments on femtosecond laser interaction, in particular, laser-induced damage. !35
机译：摘要：飞秒激光与透明固体相互作用的激光强度特征认为，可见光谱范围的冲击电磁波（SEW）的形成和传播是可能的非线性光学现象。在具有非线性光学响应的​​各向同性电介质中平面波传播的一维模型的基础上，研究了SHEW形成的主要规律。要特别注意颜色分散和吸收对SEW形成和传播的影响。获得了出现SHEW的必要条件，尤其是估计了阈值幅度。提出了一种模型的SHEW形成和传播的数值模拟模型，该模型受折射率线性和非线性部分的分散影响。通过模拟，我们研究了在透明介质中飞秒激光脉冲的几个第一个光学循环上的SHEW形成动力学。讨论了重要的观察到的光频率SHEW特征。从飞秒激光相互作用，特别是激光引起的损伤的实验观点考虑了获得的结果。 ！35

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