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

超高速イオン化における極度のレーザー周波数シフトの空間及び時間分解観測

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.*; Pathak, N. C.*; Monot, P.*; Gizzi, L. A.*

Giulietti, A.*; Andr$'e$, A.*; Dobosz-Dufr$'e$noy, S.*; Giulietti, D.*; Hosokai, Tomonao*; Koester, P.*; Kotaki, Hideyuki; Labate, L.*; Levato, T.*; Nuter, R.*; Pathak, N. C.*; Monot, P.*; Gizzi, L. A.*

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.

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パーセンタイル:66.51

分野:Physics, Fluids & Plasmas

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