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論文

Space- and time-resolved observation of extreme laser frequency upshifting during ultrafast-ionization

Giulietti, A.*; Andr$'e$, A.*; Dobosz-Dufr$'e$noy, S.*; Giulietti, D.*; 細貝 知直*; Koester, P.*; 小瀧 秀行; Labate, L.*; Levato, T.*; Nuter, R.*; et al.

Physics of Plasmas, 20(8), p.082307_1 - 082307_6, 2013/08

 被引用回数:7 パーセンタイル:30.53(Physics, Fluids & Plasmas)

A 65-fs, 800-nm, 2-TW laser pulse propagating through a Nitrogen gas jet has been experimentally studied by 90$$^{circ}$$ Thomson scattering. Time-integrated spectra of scattered light show unprecedented broadening towards the blue which exceeds 300 nm. Images of the scattering region provide for the first time a space- and time-resolved description of the process leading quite regularly to such a large upshift. The mean shifting rate was as high as $$delta lambda/delta t approx 3$$ ${AA}$/fs, never observed before. Interferometry shows that it occurs after partial laser defocusing. Numerical simulations prove that such an upshift is consistent with a laser-gas late interaction, when laser intensity has decreased well below relativistic values ($$a_0 ll 1$$) and ionization process involves most of the laser pulse. This kind of interaction makes spectral tuning of ultrashort intense laser pulses possible in a large spectral range.

論文

X-ray spectroscopic diagnostics of ultrashort laser-cluster interaction at the stage of the nonadiabatic scattering of clusters

Faenov, A. Y.; Magunov, A. I.*; Pikuz, T. A.*; Skobelev, I. Y.*; Giulietti, D.*; Betti, S.*; Galimberti, M.*; Gamucci, A.*; Giulietti, A.*; Gizzi, L. A.*; et al.

JETP Letters, 86(3), p.178 - 183, 2007/08

 被引用回数:5 パーセンタイル:37.33(Physics, Multidisciplinary)

X-ray spectroscopy diagnostics of laser-cluster interactions at a stage of non-adiabatical cluster expansion and formation of the spatially homogeneous plasma channel is carried out for the first time. It is shown, that X-ray line emission spectra of light elements, allows to determine parameters of the plasma formed at the time moment 10 ps from the beginning of femtosecond laser with relatively high plasma temperature Te 100 eV iand electron density Ne about 10$$^{19}$$ - 10$$^{20}$$ cm$$^{-3}$$.

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