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Tunable high-harmon...
Tunable high-harmonic generation by chromatic focusing of few-cycle laser pulses
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- Holgado, W. (författare)
- University of Salamanca
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- Hernández-García, C. (författare)
- University of Salamanca
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- Alonso, B. (författare)
- University of Porto,University of Salamanca
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- Miranda, M. (författare)
- Lund University,Lunds universitet,Atomfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Atomic Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
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- Silva, F. (författare)
- Sphere Ultrafast Photonics,University of Porto
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- Varela, O. (författare)
- Spanish Center for Pulsed Lasers /Centro de Laseres Pulsados Ultracortos Ultraintensos
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- Hernández-Toro, J. (författare)
- Spanish Center for Pulsed Lasers /Centro de Laseres Pulsados Ultracortos Ultraintensos
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- Plaja, L. (författare)
- University of Salamanca
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- Crespo, H. (författare)
- University of Porto,University of Salamanca
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- Sola, I. J. (författare)
- University of Salamanca
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(creator_code:org_t)
- 2017
- 2017
- Engelska.
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Ingår i: Physical Review A. - 2469-9926. ; 95:6
- Relaterad länk:
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http://dx.doi.org/10...
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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Abstract
Ämnesord
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- In this work we study the impact of chromatic focusing of few-cycle laser pulses on high-order-harmonic generation (HHG) through analysis of the emitted extreme ultraviolet (XUV) radiation. Chromatic focusing is usually avoided in the few-cycle regime, as the pulse spatiotemporal structure may be highly distorted by the spatiotemporal aberrations. Here, however, we demonstrate it as an additional control parameter to modify the generated XUV radiation. We present experiments where few-cycle pulses are focused by a singlet lens in a Kr gas jet. The chromatic distribution of focal lengths allows us to tune HHG spectra by changing the relative singlet-target distance. Interestingly, we also show that the degree of chromatic aberration needed for this control does not degrade substantially the harmonic conversion efficiency, still allowing for the generation of supercontinua with the chirped-pulse scheme, demonstrated previously for achromatic focusing. We back up our experiments with theoretical simulations reproducing the experimental HHG results depending on diverse parameters (input pulse spectral phase, pulse duration, and focus position) and proving that, under the considered parameters, the attosecond pulse train remains very similar to the achromatic case, even showing cases of isolated attosecond pulse generation for near-single-cycle driving pulses.
Ämnesord
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
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- ref (ämneskategori)
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