谐波的产生和扩展：当次级辐射具有主要后果时
Harmonic generation and filamentation: when secondary radiations have primary consequences
摘要：
在这封信中，它是实验和理论表明，弱奇次谐波产生的红外超短超强脉冲的传播过程中意外地修改介质的非线性特性，并导致一个强大的修改的传播动力学。这一结果与所有当前最先进的传播模型预测相反，其中二次辐射，如三次谐波，预计对基波脉冲传播的作用可以忽略不计。通过分析完整的三维从头计算描述微观原子的光学响应，我们已经确定了一个基本的机制，导致直接电离通道和通道之间的干扰，涉及一个单一的紫外光子。这种机制是负责广泛的折射率修改与电离率的显着变化。这项工作铺平了道路，以充分的物理理解的抑制机制，并可能导致未探索的现象，如相干控制的抑制谐波播种。
英文摘要：
In this Letter, it is experimentally and theoretically shown that weak odd harmonics generated during the propagation of an infrared ultrashort ultra-intense pulse unexpectedly modify the nonlinear properties of the medium and lead to a strong modification of the propagation dynamics. This result is in contrast with all current state-of-the-art propagation model predictions, in which secondary radiations, such as third harmonic, are expected to have a negligible action upon the fundamental pulse propagation. By analysing full three-dimensional ab initio quantum calculations describing the microscopic atomic optical response, we have identified a fundamental mechanism resulting from interferences between a direct ionization channel and a channel involving one single ultraviolet photon. This mechanism is responsible for wide refractive index modifications in relation with significant variation of the ionization rate. This work paves the way to the full physical understanding of the filamentation mechanism and could lead to unexplored phenomena, such as coherent control of the filamentation by harmonic seeding.
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