High-Order Harmonic Generation and Attosecond Science
High-Order Harmonic Generation and Attosecond Science
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DOI：
10.1143/jjap.50.090001
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发表时间：
2011-09
影响因子：
1.5
通讯作者：
K. Midorikawa
中科院分区：
文献类型：
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作者：
K. Midorikawa
自20多年前首次观测到高次谐波以来，高次谐波产生的研究在不断变化的同时也取得了进展。在其起步阶段，研究的主要关注点是了解HHG的潜在物理特性，然后兴趣转移到软x射线区域的相干源的发展。目前的研究重点是阿秒科学。由于HHG是基于在基本激发脉冲的单光周期内的隧道电离和辐射复合，因此它可以表现为在阿秒时间尺度上由光波与电子相互作用引起的各种有趣现象。因此，HHG是一种独特的现象，为我们提供了一种观察原子和分子中阿秒量子动力学的方法，以及一个独特的相干源，覆盖了从紫外到软x射线区域的几十个八度的光谱。在这篇报告中，我回顾了HHG产生阿秒脉冲的最新进展及其在观察原子和分子中的阿秒动力学方面的应用，并重点介绍了我们最近的工作。
Since the first observation of high-order harmonics about two decades ago, research on high-order harmonic generation (HHG) has progressed while changing its focus. In its infancy, a major concern of research was to understand the underlying physics of HHG, then interest shifted to the development of a coherent source in the soft X-ray region. Research is now focused on attosecond science. Because HHG is based on tunneling ionization followed by radiative recombination during a single optical cycle of the fundamental excitation pulse, it can manifest itself as a variety of interesting phenomena caused by the interaction of light waves with electrons on the attosecond time scale. Therefore, HHG is a unique phenomenon that provides us with a method of observing attosecond quantum dynamics in atoms and molecules as well as with a unique coherent source covering a spectrum spanning several tens of octaves from ultraviolet to the soft X-ray region. In this report, I review the recent progress in attosecond pulse generation by HHG and its application to observing attosecond dynamics in atoms and molecules while focusing on our recent works.