High-flux soft x-ray harmonic generation from ionization-shaped few-cycle laser pulses.
High-flux soft x-ray harmonic generation from ionization-shaped few-cycle laser pulses.
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DOI:
10.1126/sciadv.aar3761
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发表时间:
2018-05
期刊:
影响因子:
13.6
通讯作者:
Marangos JP
中科院分区:
文献类型:
--
作者:
Johnson AS;Austin DR;Wood DA;Brahms C;Gregory A;Holzner KB;Jarosch S;Larsen EW;Parker S;Strüber CS;Ye P;Tisch JWG;Marangos JP
X-ray harmonics made with long-wavelength lasers reach higher fluxes and photon energies when plasma effects dominate. Laser-driven high-harmonic generation provides the only demonstrated route to generating stable, tabletop attosecond x-ray pulses but has low flux compared to other x-ray technologies. We show that high-harmonic generation can produce higher photon energies and flux by using higher laser intensities than are typical, strongly ionizing the medium and creating plasma that reshapes the driving laser field. We obtain high harmonics capable of supporting attosecond pulses up to photon energies of 600 eV and a photon flux inside the water window (284 to 540 eV) 10 times higher than previous attosecond sources. We demonstrate that operating in this regime is key for attosecond pulse generation in the x-ray range and will become increasingly important as harmonic generation moves to fields that drive even longer wavelengths.
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