Quantum Path Interference and Multiple Electron Scattering in Soft X-Ray High-Order Harmonic Generation

Seres, J.; Seres, E.; Landgraf, Bjoern; Aurand, B.; Kuehl, Thomas J.; Spielmann, Christian

doi:10.3390/photonics2010104

Cited by 6 publications

(4 citation statements)

References 40 publications

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“…HHG is very flexible and able to fulfill the demand of different applications, viz. it can generate very short pulses with durations even of attoseconds [1,2], or very high harmonics with energies of few keV [3][4][5][6] for time resolved spectroscopy [7,8].…”

Section: Introductionmentioning

confidence: 99%

Avalanche of stimulated forward scattering in high harmonic generation

et al. 2016

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© 2016 [Optical Society of America]. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.Optical amplifiers in all ranges of the electromagnetic spectrum exhibit an essential characteristic, namely the input signal during the propagation in the amplifier medium is multiplied by the avalanche effect of the stimulated emission to produce exponential growth. We perform a theoretical study motivated and supported by experimental data on a He gas amplifier driven by intense 30-fs-long laser pulses and seeded with attosecond pulse trains generated in a separated Ne gas jet. We demonstrate that the strong-field theory in the frame of high harmonic generation fully supports the appearance of the avalanche effect in the amplification of extreme ultraviolet attosecond pulse trains. We theoretically separate and identify different physical processes taking part in the interaction and we demonstrate that X-ray parametric amplification dominates over others. In particular, we identify strong-field mediated intrapulse X-ray parametric processes as decisive for amplification at the single-atom level. We confirm that the amplification takes place at photon energies where the amplifier is seeded and when the seed pulses are perfectly synchronized with the driving strong field in the amplifier. Furthermore, propagation effects, phase matching and seed synchronization can be exploited to tune the amplified spectral range within the seed bandwidth.Peer ReviewedPostprint (author's final draft

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Section: Introductionmentioning

confidence: 99%

Avalanche of stimulated forward scattering in high harmonic generation

et al. 2016

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“…XPA was experimentally demonstrated in Ar gas at around 40 eV photon energies [1, 3] and explained theoretically [4]. In He gas, the process was experimentally observed from around 100 eV [5] to photon energies up to keV [6,7], which was supported by numerical studies [8,9,10]. The underlying process has been theoretically described from several different viewpoints; classical, semi-classical and quantum mechanical.…”

Section: Introductionmentioning

confidence: 95%

Nonlinear propagation effect in x-ray parametric amplification during high harmonic generation

Seres

Serrat

et al. 2022

J. Opt. Soc. Am. B

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We report the realization and characterization of parametric amplification in high harmonic generation around 100 eV using He gas in a double gas jet arrangement. The delay of the seed extreme ultraviolet (XUV) pulse with respect to the amplifier gas jet was scanned by changing the distance between the gas jets. Experiments and numerical calculations show that parametric amplification occurs within a temporal window of several optical cycles. Strong correlation between the seed and amplifier was observed in a shorter, few optical cycles delay range, which appeared as a modulation of the XUV intensity with an unexpected one optical cycle periodicity instead of half optical cycle. Simulations revealed that the strong correlation and also the unusual periodicity was the consequence of the nonlinear effect produced by plasma dispersion on the parametric amplification process during propagation in the amplifier jet.

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“…In both cases, complex behaviors were observed. Inspecting the beam profiles and their interference effects, the role and importance of the short and long electron trajectories and the quantum path interferences in the generation process have been resolved [10][11][12][16][17][18][19]. The spectral shift of the harmonic lines from their expected spectral position was also recognized.…”

Section: Introductionmentioning

confidence: 97%

Spectral Shift and Split of Harmonic Lines in Propagation Affected High Harmonic Generation in a Long-Interaction Gas Tube

Seres,

Serrat

et al. 2023

Atoms

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While generating high harmonics in long media of helium gas, at certain laser intensities and chirp, the spectral shift and split of the harmonic lines were experimentally observed, sometimes exceeding one harmonic order. Beyond reporting these results, numerical simulations were performed to understand the phenomenon. A 3D propagation model was solved under the strong field approximation. According to the simulations, the distortion of the laser beam profile during propagation and the consequently accused change in the conditions of phase matching are responsible for the observations. The observed phenomena can be an excellent tool to produce tunable narrow band harmonic sources covering a broad range around 13.5 nm for spectroscopy and for seeding X-ray lasers, and to understand non-desired detuning of the seed wavelength.

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Quantum Path Interference and Multiple Electron Scattering in Soft X-Ray High-Order Harmonic Generation

Cited by 6 publications

References 40 publications

Avalanche of stimulated forward scattering in high harmonic generation

Avalanche of stimulated forward scattering in high harmonic generation

Nonlinear propagation effect in x-ray parametric amplification during high harmonic generation

Spectral Shift and Split of Harmonic Lines in Propagation Affected High Harmonic Generation in a Long-Interaction Gas Tube

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