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10 June 2024 Influence of pulse duration on high harmonics emitted from wide bandgap dielectrics
Hortense Allegre, Joseph Broughton, Tim Klee, Yan Li, Katarzyna Kowalczyk, Nikolas Thatte, Daniel Lim, Jon Marangos, Mary Matthews, John Tisch
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Proceedings Volume 12992, Advances in Ultrafast Condensed Phase Physics IV; 129920A (2024) https://doi.org/10.1117/12.3021909
Event: SPIE Photonics Europe, 2024, Strasbourg, France
Abstract
We investigate here the influence of pulse duration on high harmonic spectra in a wide band gap dielectric, MgO. Employing a Ti:S pulse compressed in a hollow core fiber, we can effectively tune the output pulse duration from 30 fs to 4.5 fs. By systematically varying both intensity and pulse duration, we explore macroscopic scaling laws governing harmonic generation in solids. We examine the cut-off energy, divergence, and emission wavelength. Notably, we show in the measured harmonics spectra differences in the highest energy reached, the shape of the harmonics and their center emitted energy. Pulse duration significantly impacts the emission process, thereby modulating the spectro-spatial characteristics of the generated harmonics, even at constant intensity levels.
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Hortense Allegre, Joseph Broughton, Tim Klee, Yan Li, Katarzyna Kowalczyk, Nikolas Thatte, Daniel Lim, Jon Marangos, Mary Matthews, and John Tisch "Influence of pulse duration on high harmonics emitted from wide bandgap dielectrics", Proc. SPIE 12992, Advances in Ultrafast Condensed Phase Physics IV, 129920A (10 June 2024); https://doi.org/10.1117/12.3021909
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KEYWORDS
Solids
Dielectrics
Harmonic generation
Extreme ultraviolet
High harmonic generation
Semiconductors
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