High-order harmonic generation (HHG) is expected to produce high-quality coherent ultrashort light sources. We propose a scheme similar to laser mode locking to selectively enhance and compress HHG in crystals through nonuniform illuminations and phase matching. The selective enhancement of harmonics reflects attosecond-resolved electron dynamics. And these harmonic characteristics originate from the interference of harmonics from different lattices. It paves the way for the practical application of solid HHG with high conversion efficiencies and the detection of electron-hole dynamics with ultrahigh spatial-temporal resolution.

中文翻译：

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通过调整不均匀辐射优化晶体高次谐波产生

高次谐波产生（HHG）有望产生高质量的相干超短光源。我们提出一种类似于激光锁模的方案，通过不均匀的照明和相位匹配来选择性地增强和压缩晶体中的HHG。谐波的选择性增强反映了阿秒分辨的电子动力学。这些谐波特性源自不同晶格的谐波干扰。它为具有高转换效率的固体HHG的实际应用以及具有超高时空分辨率的电子-空穴动力学的检测铺平了道路。