Continuous spectra in high-harmonic generation driven by multicycle laser pulses

We present observations of the emission of XUV continua in the 20-37 eV region by high harmonic generation (HHG) with \(4\)-\(7\ \mathrm{fs}\) pulses focused onto a Kr gas jet. The underlying mechanism relies on coherent control of the relative delays and phases between individually generated attose...

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Bibliographic Details
Published in:arXiv.org 2015-10
Main Authors: Holgado, W, Hernández-García, C, Alonso, B, Miranda, M, Silva, F, Plaja, L, Crespo, H, Sola, I J
Format: Article
Language:English
Subjects:
Attosecond pulses
Chirp
Continuous spectra
Gas jets
Harmonic generations
Phase matching
Online Access:Get full text
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Summary:We present observations of the emission of XUV continua in the 20-37 eV region by high harmonic generation (HHG) with \(4\)-\(7\ \mathrm{fs}\) pulses focused onto a Kr gas jet. The underlying mechanism relies on coherent control of the relative delays and phases between individually generated attosecond pulse, achievable by adjusting the chirp of the driving pulses and the interaction geometry. Under adequate negative chirp and phase matching conditions, the resulting interpulse interference yields a continuum XUV spectrum, which is due to both microscopic and macroscopic (propagation) contributions. This technique opens the route for modifying the phase of individual attosecond pulses and for the coherent synthesis of XUV continua from multicycle driving laser pulses without the need of an isolated attosecond burst.
ISSN:2331-8422
DOI:10.48550/arxiv.1504.04063