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首页> 外文期刊>Bulletin of the American Physical Society >APS -84th Annual Meeting of the APS Southeastern Section - Event - Spatiotemporal Properties of Solid State Harmonics
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APS -84th Annual Meeting of the APS Southeastern Section - Event - Spatiotemporal Properties of Solid State Harmonics

机译：APS-APS东南分部第84届年会-事件-固态谐波的时空特性

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As shown by recent experiments, high-order harmonics can be generated in a transparent crystal by a high intensity infrared laser beam. We investigate the spatial and temporal properties of such harmonics by calculating the harmonic spectrum at many different points in space spanning the laser focus and then transforming to the far field. Each harmonic spectrum is calculated by solving the time-dependent Schr?dinger equation for an electron in a periodic potential to find the laser-driven electron current that gives rise to the harmonic radiation. We find two distinct contributions to the harmonic radiation in the far-field distribution, and by using a spatial filter we isolate the central contribution. After performing a back-transformation to the near-field, we find that the filtered integrated spectrum is much cleaner than the original as it shows stronger peaks at odd harmonics. We find that the spatial filter also works as a temporal filter, so that the sub-cycle harmonic time profile after filtering is dominated by one burst of light per half-cycle of the laser field. Our results suggest that many of the techniques used to control the spatiotemporal properties of high order harmonics from gases can also be applied to harmonics from solids.
机译：如最近的实验所示，高强度的红外激光束可在透明晶体中产生高次谐波。我们通过计算跨越激光焦点的空间中许多不同点的谐波谱，然后转换到远场，来研究此类谐波的时空特性。通过求解周期电势中电子的时间相关薛定er方程来计算每个谐波频谱，以找到产生谐波辐射的激光驱动电子电流。我们在远场分布中发现了两个对谐波辐射的明显贡献，并且通过使用空间滤波器，我们可以分离出中心贡献。对近场进行反向转换后，我们发现滤波后的积分谱比原始谱干净得多，因为它在奇次谐波处显示出更强的峰值。我们发现空间滤波器还可以用作时间滤波器，因此滤波后的子周期谐波时间分布以激光场每半个周期的一束光为主。我们的结果表明，许多用于控制来自气体的高次谐波的时空特性的技术也可以应用于来自固体的谐波。

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