Symmetry-controlled time structure of high-harmonic carrier fields from a solid.
Symmetry-controlled time structure of high-harmonic carrier fields from a solid.
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DOI：
10.1038/nphoton.2017.29
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发表时间：
2017-04
期刊：
影响因子：
35
通讯作者：
Huber R
中科院分区：
文献类型：
--
作者：
Langer F;Hohenleutner M;Huttner U;Koch SW;Kira M;Huber R
晶体固体中高次谐波的产生是一个令人兴奋的发展，在高效阿秒光源、全光学带结构重建和准粒子碰撞等方面具有潜在的应用。虽然HH强度的光谱和时间形状已经被微观地描述，但是基础HH载波的性质仍然难以捉摸。在这里，我们分析了由相同驱动脉冲的连续半周期在结晶固体中产生的HH波形的序列。将频率梳的概念扩展到光时钟速率，我们展示了如何通过晶体对称性控制HH脉冲的偏振和载波包络相位（CEP）。对于某些晶体方向，我们可以分离两个正交偏振的HH梳，它们相互偏移驱动频率，以形成偶次和奇次谐波的梳。连续脉冲的相应CEP是恒定的或偏移π，这取决于偏振。在固体的量子描述的背景下，我们确定了新的能力，偏振和相位成形的HH波形，不能与气体源访问。
High-harmonic (HH) generation in crystalline solids marks an exciting development, with potential applications in high-efficiency attosecond sources, all-optical bandstructure reconstruction, and quasiparticle collisions. Although the spectral and temporal shape of the HH intensity has been described microscopically, the properties of the underlying HH carrier wave have remained elusive. Here we analyse the train of HH waveforms generated in a crystalline solid by consecutive half cycles of the same driving pulse. Extending the concept of frequency combs to optical clock rates, we show how the polarization and carrier-envelope phase (CEP) of HH pulses can be controlled by crystal symmetry. For some crystal directions, we can separate two orthogonally polarized HH combs mutually offset by the driving frequency to form a comb of even and odd harmonic orders. The corresponding CEP of successive pulses is constant or offset by π, depending on the polarization. In the context of a quantum description of solids, we identify novel capabilities for polarization- and phase-shaping of HH waveforms that cannot be accessed with gaseous sources.