High-order harmonic generation (HHG) in atomic gases is one of the key phenomena in strong-field laser-matter interactions, playing a central role in optical physics and rapidly growing attosecond technologies. When applied to solid materials [1 - 3], approaches of strong-field physics are subject to natural limitations, related to absorption and much lower laser damage thresholds of solids. As a reward, such solid-state extensions promise breakthroughs toward petahertz solid-state optoelectronics, open avenues toward attosecond science on the platform of solid-state materials, and suggest new all-optical methods for crystallographic analysis.
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