Attosecond synchronization of extreme ultraviolet high harmonics from crystals
Attosecond synchronization of extreme ultraviolet high harmonics from crystals
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DOI：
10.1088/1361-6455/ab8e56
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发表时间：
2020-01
期刊：
影响因子：
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通讯作者：
G. Vampa;Jian Lu;Y. You;D. Baykusheva;Mengxi Wu;Hanzhe Liu;K. Schafer;M. Gaarde;D. Reis;S. Ghimire
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文献类型：
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作者：
G. Vampa;Jian Lu;Y. You;D. Baykusheva;Mengxi Wu;Hanzhe Liu;K. Schafer;M. Gaarde;D. Reis;S. Ghimire
强近红外激光脉冲与宽带隙飞秒激光相互作用会产生极紫外波段的高次谐波。这些观察开辟了固体阿秒计量的可能性，这将受益于相对于近红外激光场的各个谐波发射时间的精确测量。在这里，我们表明，当从氧化镁晶体的输入表面检测到高次谐波时，双色探测的XUV发射显示出明显的同步性，这在很大程度上与散装固体中电子-空穴相互作用的半经典模型一致。另一方面，源于200 μ m厚晶体出射表面的谐波的双色谱图被强烈地修改，表明在传输过程中激光场畸变的影响。我们的子周期电子和空穴的再碰撞在XUV能量的跟踪是相关的固态源的阿秒脉冲的发展。
The interaction of strong near-infrared (NIR) laser pulses with wide-bandgap dielectrics produces high harmonics in the extreme ultraviolet (XUV) wavelength range. These observations have opened up the possibility of attosecond metrology in solids, which would benefit from a precise measurement of the emission times of individual harmonics with respect to the NIR laser field. Here we show that, when high-harmonics are detected from the input surface of a magnesium oxide crystal, a bichromatic probing of the XUV emission shows a clear synchronization largely consistent with a semiclassical model of electron–hole recollisions in bulk solids. On the other hand, the bichromatic spectrogram of harmonics originating from the exit surface of the 200 μm-thick crystal is strongly modified, indicating the influence of laser field distortions during propagation. Our tracking of sub-cycle electron and hole re-collisions at XUV energies is relevant to the development of solid-state sources of attosecond pulses.