Observation of chromatic effects in high-order harmonic generation

High-harmonic generation sources can produce coherent, broadband radiation at extreme-ultraviolet and soft-x-ray wavelengths. The wavefronts of the generated high-order harmonics are influenced by the incident laser field, the generation conditions, and geometry. These influences depend on harmonic...

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Veröffentlicht in:Physical review research 2023-10, Vol.5 (4), p.043100, Article 043100
Hauptverfasser: Liu, Xiaomeng, Pelekanidis, Antonios, Du, Mengqi, Zhang, Fengling, Eikema, Kjeld S. E., Witte, Stefan
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Sprache:eng
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Zusammenfassung:High-harmonic generation sources can produce coherent, broadband radiation at extreme-ultraviolet and soft-x-ray wavelengths. The wavefronts of the generated high-order harmonics are influenced by the incident laser field, the generation conditions, and geometry. These influences depend on harmonic wavelength, which may result in wavelength-dependent focusing properties and spatiotemporal couplings that can affect attosecond physics experiments. We experimentally demonstrate and characterize these chromatic effects in high-harmonic generation by measuring the spectrally resolved high-harmonic wavefronts as a function of generation conditions. We find that the high-harmonic generation process can have significant intrinsic chromatic aberration, particularly for converging incident laser fields. Furthermore, we identify regimes where chromatic effects can be minimized, and show that analytical single-atom models allow accurate predictions of harmonic wavefronts produced by a specific driving field.
ISSN:2643-1564
2643-1564
DOI:10.1103/PhysRevResearch.5.043100