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Photo-ionization of wide band-gap materials by high-intensity laser radiation

机译：高强度激光辐射使宽带隙材料光电离

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摘要

Analyzing existing theoretical models of laser-induced photo-ionization of non-metallic solids, we came to conclusion that they are not valid to describe ionization of wide band-gap materials by high-intensity radiation due to specific limitation on either intensity or laser wavelength. Attempting to improve the theory of photo-ionization, we combined the Keldysh approach and a realistic energy-band model to include the effect of Bragg-type electron reflections at edges of the first Brillouin zone. It was found that the effect of Bragg-type electron reflections produces a set of singularities on intensity dependence of ionization rate. Intensity at which the first singularity occurs is close to 10 TW/cm~2 for most transparent materials and visible or near-IR spectrum range. Further considerations show the singularities to be directly related to the effect of field-induced flattening of effective band structure under action of laser radiation. We discuss some recent experimental results from the view-point of the new ionization model.
机译：分析现有的非金属固体激光诱导电离的理论模型，我们得出的结论是，由于强度或激光波长的特定限制，它们不能有效描述通过高强度辐射引起的宽带隙材料的电离。为了改进光电离理论，我们将Keldysh方法和实际的能带模型相结合，以包括在第一个布里渊区边缘的布拉格型电子反射的影响。发现布拉格型电子反射的作用在电离速率的强度依赖性上产生了一组奇点。对于大多数透明材料和可见或近红外光谱范围，出现第一个奇点的强度接近10 TW / cm〜2。进一步的考虑表明，奇异点与在激光辐射作用下有效带结构的场致平坦化的影响直接相关。我们将从新的电离模型的角度讨论一些最近的实验结果。

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