Broadband Spectral Amplitude Control in High-Order Harmonic Generation

Serrat, Carles

doi:10.3390/app2040816

Cited by 10 publications

(5 citation statements)

References 31 publications

(34 reference statements)

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“…Such nonlinear interactions, as X-ray parametric amplification (XPA), can cause amplification of the XUV pulse in the gas medium. Both nonlinear enhanced ionization and stimulated amplification have been theoretically studied, namely, a XUV seed pulse was shown to produce new harmonic lines [14], and it was shown to be amplified by backward scattering [15] or forward scattering [16][17][18][19][20]. Parametric amplification processes have been recently measured and described also by perturbative highorder parametric interaction [21] and by ab initio simulations in hydrogen molecular ions [22].…”

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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“…The simultaneous illumination of atoms with an intense infrared (IR) pulse and a weak extreme ultraviolet (XUV) pulse has been suggested as a means for table-top coherent XUV radiation sources with shaped attosecond pulses [1,2] and with high photon energies via selective yield enhancement [3] in high-order harmonic generation (HHG) processes. The effect of XUV radiation combined with intense IR pulses on the HHG spectrum has been theoretically and experimentally investigated by several authors [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Coherent amplification of attosecond light pulses in the water-window spectral region

Serrat¹,

Roca²,

Seres³

2015

Opt. Express

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]. La impressió o còpia electrònica es poden fer només per a ús personal . La reproducció, la distribució, la duplicació amb finalitats comercials i la modificació de continguts queden prohibides.Serrat, C., Roca, D., Seres, J. (2015) Abstract: We present a theoretical study on coherent extreme ultraviolet (XUV) attosecond pulse amplification mediated by nonlinear parametric enhanced forward scattering occurring in the interaction of a strong femtosecond infrared (IR) laser pulse combined with a weak attosecond XUV pulse train with an atom. We predict large amplification of XUV radiation when the IR strong pulse and the XUV weak pulse are optimally phased. We study high-order harmonic processes (HHG) in He, He + and Ne ++ , and show how although the HHG yield is largely affected by the particular atom used as target, nonlinear parametric XUV amplification is only weakly affected. We conclude that XUV nonlinear parametric attosecond pulse amplification can be most efficiently observed by using atoms with a high ionization potential and that the nonlinear amplification is robust at high photon energies where HHG is not efficient, such as in the water-window spectral region.

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“…Since the description of the propagation of the generating IR laser pulse and the harmonic radiation is full of twists and turns [24][25][26], i.e., Equations (1) and (5) suggest a complex intensity and wavelength dependence, the implementation of an evolutionary algorithm for finding the best suited pulse-shape is an established technique. (a) is a typical HHG spectrum from a hollow-core fiber with a pulse that is compressed by translating the prisms for highest XUV yield and using a flat mirror surface; (b) shows an optimization of the overall yield by adaptively shaping the deformable mirror.…”

Section: Tailored High-harmonic Generation In a Gas-filled Hcfmentioning

confidence: 99%

Extremely Nonlinear Optics Using Shaped Pulses Spectrally Broadened in an Argon- or Sulfur Hexafluoride-Filled Hollow-Core Fiber

2015

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Abstract:In this contribution we present a comparison of the performance of spectrally broadened ultrashort pulses using a hollow-core fiber either filled with argon or sulfur hexafluoride (SF6) for demanding pulse-shaping experiments. The benefits of both gases for pulse-shaping are studied in the highly nonlinear process of high-harmonic generation. In this setup, temporally shaping the driving laser pulse leads to spectrally shaping of the output extreme ultraviolet (XUV) spectrum, where total yield and spectral selectivity in the XUV are the targets of the optimization approach. The effect of using sulfur hexafluoride for pulse-shaping the XUV yield can be doubled compared to pulse compression and pulse-shaping using argon and the spectral range for selective optimization of a single harmonic can be extended. The obtained results are of interest for extending the range of ultrafast science applications drawing on tailored XUV fields.

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Broadband Spectral Amplitude Control in High-Order Harmonic Generation

Cited by 10 publications

References 31 publications

Avalanche of stimulated forward scattering in high harmonic generation

Avalanche of stimulated forward scattering in high harmonic generation

Coherent amplification of attosecond light pulses in the water-window spectral region

Extremely Nonlinear Optics Using Shaped Pulses Spectrally Broadened in an Argon- or Sulfur Hexafluoride-Filled Hollow-Core Fiber

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