Bloch-Wave Phase Matching of High Harmonic Generation in Solids,Physical Review Letters

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Bloch-Wave Phase Matching of High Harmonic Generation in Solids
Physical Review Letters ( IF 8.1 ) Pub Date : 2024-09-09 , DOI: 10.1103/physrevlett.133.116902
Liang Li _{1,

2} , Yuntian Zhang ₁ , Jiapeng Li ₁ , Pengfei Lan _{1,

2} , Peixiang Lu _{1,

2}

Affiliation

There has been a longstanding doubt that the conversion efficiency of high harmonics in solids is much lower than expected at such a high level of electron density. To address this issue, we revisit the dynamical process of high harmonic generation (HHG) in solids in terms of wavelet interference. We find that the constructive interference among the wavelets has intrinsic consistency with the phase matching of coupled waves in nonlinear optics, which we call Bloch-wave phase matching. Our analysis indicates that most of the wavelets are out of phase and coherently canceled out during the solid HHG process, leading to only a small fraction of excited electrons effectively contributing to HHG. Consequently, the conversion from the excited electron to HHG is fairly low. Moreover, a Bloch-wave phase-matching scheme is proposed and a nearly 3 orders of magnitude enhancement of solid HHG can be achieved by engineering the crystal structures. Our Letter addresses a longstanding doubt and provides a novel idea and theoretical guidance for realizing efficient all-solid-state tabletop ultraviolet light sources.

中文翻译：

固体中高次谐波产生的布洛赫波相位匹配

长期以来人们一直怀疑，在如此高的电子密度水平下，固体中高次谐波的转换效率远低于预期。为了解决这个问题，我们从小波干涉的角度重新审视固体中高次谐波产生（HHG）的动力学过程。我们发现小波之间的相长干涉与非线性光学中耦合波的相位匹配具有内在的一致性，我们称之为布洛赫波相位匹配。我们的分析表明，在固体 HHG 过程中，大多数小波都是异相的并且相干地抵消，导致只有一小部分激发电子有效地促进了 HHG。因此，从受激电子到 HHG 的转化率相当低。此外，提出了布洛赫波相位匹配方案，并且通过设计晶体结构可以将固体 HHG 提高近 3 个数量级。我们的信解决了一个长期存在的疑问，并为实现高效全固态桌面紫外光源提供了新颖的想法和理论指导。

更新日期：2024-09-09

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