Spectrally Resolved Maker Fringes in High-Order Harmonic Generation

Heyl, Christoph M.; Guedde, J.; Hoefer, Ulrich; L’Huillier, Anne

doi:10.1103/physrevlett.107.033903

Cited by 66 publications

(71 citation statements)

References 36 publications

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“…When d jet is changed, the phase-matching conditions that evolve with density and length of the medium are changed but the spectral structures are present for all the gas jet positions. This implies that the phase matching or the propagation are not the dominant mechanisms creating the observed structures in contrary to previous works 22,26,31 . Neither QPI, that requires specific interaction conditions to appear [23][24][25] and strongly changes from one harmonic to the other, is a dominant mechanism here.…”

Section: Resultscontrasting

confidence: 53%

“…2. Consequently, propagation, phase matching or QPI, in contrary to previous works [22][23][24][25][26]31 , are not the dominant mechanisms driving the spatio-spectral structures that we observed. The key parameters are the nonlinearity of the atomic response, its saturation and the depletion of the ground state so that the harmonic source is shaped spatially and temporally during the generation process.…”

Section: Article Nature Communications | Doi: 101038/ncomms5637contrasting

confidence: 55%

“…1a) obtained with long pulses (40 fs) has a well-known shape with sharp and well-defined harmonics. They are, however, spectrally asymmetric, which is a signature of ionization that restrict emission to the leading edge of the pulse 34 (symmetric harmonics similar to those shown in Heyl et al 26 could be obtained at lower intensity).…”

Section: Resultsmentioning

confidence: 99%

“…From the spatial point of view, the inter-fringe distance also evolves within a harmonic and as a spectral position can be associated to an emission time 26 , it translates the time evolution of the size of the source: the emission from the rising edge of the IR pulse, corresponding to a smaller size of the emitting region, will correspond to a blueshifted frequency with a large spatial pattern in the far field (Figs 1d, 3b,c, 4c). In contrast, the latest emission in Fig.…”

Section: Article Nature Communications | Doi: 101038/ncomms5637mentioning

confidence: 99%

“…They are therefore major issues in Attoscience and they have been widely studied. Structures due to interferences have been observed in the XUV spectra, and depending on the experimental conditions, they originate from different phenomena: quantum path interference (QPI) [22][23][24][25] , phase matching 26 or caustics 27 . Also, spectral interferences can be observed in the harmonic spectra when the attosecond pulse train is very short 28,29 .…”

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confidence: 99%

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Spatio–spectral structures in high-order harmonic beams generated with Terawatt 10-fs pulses

et al. 2014

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A large international effort is nowadays devoted to increase the energy of the extreme ultraviolet pulses by using high-peak power ultrashort fundamental pulses (Terawatt level). Using such fundamental pulses brings specific constraints that need to be addressed. Here we study high-order harmonic generation in gases with 10 fs pulses at Terawatt peak power and demonstrate that extreme ultraviolet beams can be highly structured and complex in various conditions. We use a single-shot spatially resolved spectral detection and demonstrate direct observation of the spatio-temporal coupling occuring in the generating medium. Clear and reproducible complex spatio-spectral structures are observed in the far field. Similar structures are reproduced with simulations and we show that they are intimately associated to the high nonlinearity of high-order harmonic generation. Those findings are of prime importance for the generation of high-energy attosecond pulses and reveal important issues for their applications.

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Section: Resultscontrasting

confidence: 53%

Section: Article Nature Communications | Doi: 101038/ncomms5637contrasting

confidence: 55%

Section: Resultsmentioning

confidence: 99%

Section: Article Nature Communications | Doi: 101038/ncomms5637mentioning

confidence: 99%

mentioning

confidence: 99%

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Spatio–spectral structures in high-order harmonic beams generated with Terawatt 10-fs pulses

et al. 2014

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Comparison of the Resonance‐, Nanoparticle‐, and Quasi‐Phase‐Matching‐Induced Processes Leading to the Growth of High‐Order Harmonic Yield

2018

Resonance Enhancement in Laser‐Produced Plasmas

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High‐Order Harmonic Generation and Attosecond Light Pulses: An Introduction

L’Huillier

2014

Attosecond and XUV Physics

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This chapter describes how the understanding of high-order harmonic generation (HHG) and the generation of attosecond pulses progressed since the first experiments, which were performed at the end of the 1980s. The text describes how the ideas arose, as perceived by the author of this chapter. It is neither a detailed and comprehensive review nor a documented historical background. Early Work, 1987-1993Somewhat surprisingly, HHG was not discovered in the nonlinear optics community, but by scientists interested in the response of atoms to intense laser fields. In nonlinear optics, the general (and quite reasonable) understanding was that highorder processes are less probable than low-order processes. Consequently, on a not so successful route toward vacuum ultraviolet light, researchers used ultraviolet radiation in order to start with VUV photons. At the same time, a lot of progress in laser technology allowed scientists to focus radiation at very high intensities, reaching 10 13 10 15 W/cm 2 . Atoms, when exposed to such intense radiation, get ionized by absorbing several photons. Above-threshold-ionization and multiple-ionization were observed as unexpected results of such experiments.One experimental idea was to detect fluorescence emitted by excited atoms or ions that were produced during strong field excitation. To this end, the pressure of sample atoms in the interaction chamber had to be increased: gas jets were installed, and photon detectors were placed along the laser propagation axis. First results for HHG from VUV radiation were obtained by Rhodes and his co-workers, using a 248-nm excimer laser with high laser intensity [1]. Strong fluorescence was seen from Ar, Kr and Xe ions, together with high harmonics up to the 17th harmonic in Ne. Shortly afterward, high-order harmonics were observed in Xe, Kr and Ar using a 30-ps Nd:YAG laser (1064 nm) [2]. The HHG spectra exhibited a characteristic behavior, with a rapid intensity decrease for the first orders, a plateau from the seventh harmonic up to a very high order (e.g., the 29th in Ar) and an abrupt cutoff.Attosecond and XUV Physics, First Edition. Edited by Thomas Schultz and Marc Vrakking.

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Spectrally Resolved Maker Fringes in High-Order Harmonic Generation

Cited by 66 publications

References 36 publications

Spatio–spectral structures in high-order harmonic beams generated with Terawatt 10-fs pulses

Spatio–spectral structures in high-order harmonic beams generated with Terawatt 10-fs pulses

Comparison of the Resonance‐, Nanoparticle‐, and Quasi‐Phase‐Matching‐Induced Processes Leading to the Growth of High‐Order Harmonic Yield

High‐Order Harmonic Generation and Attosecond Light Pulses: An Introduction

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