Colloquium: Optimal control of high-harmonic generation
Colloquium: Optimal control of high-harmonic generation
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DOI：
10.1103/revmodphys.80.117
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发表时间：
2008-01
影响因子：
44.1
通讯作者：
C. Winterfeldt;C. Spielmann;G. Gerber
中科院分区：
文献类型：
--
作者：
C. Winterfeldt;C. Spielmann;G. Gerber
高次谐波产生在光谱的极紫外（XUV）和软X射线区域中提供有吸引力的相干辐射光源，并且允许产生单个阿秒脉冲或脉冲串。本次学术讨论会涵盖了高次谐波光谱的时间和空间脉冲整形的驱动激光脉冲的控制及其对时间分辨XUV光谱和阿秒脉冲整形的影响。总结了将现有的脉冲整形技术和控制方案从近红外或可见光部分扩展到更短波长的重要步骤。使用驱动激光脉冲的自适应脉冲整形，几个小组已经证明了对高次谐波光谱的控制，包括作者对在充气中空纤维中产生的高次谐波的XUV光谱的完全控制的工作。可以实现对单个或几个选定谐波阶次的增强和抑制。这些任意形状的软X射线光谱将允许在时域中对所得谐波脉冲进行重要修改。这构成了软X射线域中直接阿秒脉冲成形的第一步。此外，在空芯光纤中的高次谐波产生可以通过使用反馈控制的自适应二维空间光调制器耦合到单个光纤模式中来增强。
High-harmonic generation provides an attractive light source of coherent radiation in the extreme-ultraviolet (XUV) and soft-x-ray regions of the spectrum and allows for the production of single attosecond pulses or pulse trains. This Colloquium covers the control of high-harmonic spectra by temporal and spatial pulse shaping of the driving laser pulses and its implications on time-resolved XUV spectroscopy and attosecond pulse shaping. It summarizes important steps for extending existing pulse shaping techniques and control schemes from the near-infrared or visible part to shorter wavelengths. Using adaptive pulse shaping of the driving laser pulses, several groups have demonstrated control of the high-harmonic spectrum, including the author's work on the complete control over the XUV spectrum of high-order harmonics, generated in a gas-filled hollow fiber. It is possible to achieve both the enhancement and the suppression of single or several selected harmonic orders. These arbitrarily shaped soft-x-ray spectra will allow for important modifications of the resulting harmonic pulses in the temporal domain. This constitutes first steps towards direct attosecond pulse shaping in the soft-x-ray domain. Moreover, high-harmonic generation in a hollow-core fiber can be enhanced by coupling into a single fiber mode using a feedback-controlled adaptive two-dimensional spatial light modulator.