Complex structure of spatially resolved high-order-harmonic spectra

Catoire, F.; Ferré, A.; Hort, O.; Dubrouil, A.; Quintard, Ludovic; Descamps, D.; Petit, S.; Burgy, F.; Mével, E.; Mairesse, Y.; Constant, Éric

doi:10.1103/physreva.94.063401

Cited by 48 publications

(54 citation statements)

References 48 publications

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“…In figure 3(c) we can see the curved spatio-spectral features near harmonic lines H4.5, H5 and H5.5. These features are similar to the ones provided by the long electronic trajectories contribution to the HHG in intense laser fields [32,33]. The features in figure 3 cannot be directly attributed to these trajectories because the rescattering picture is inapplicable, even qualitatively, for the relatively low intensities used in our experiments.…”

Section: Spatial Structuresupporting

confidence: 78%

Hyper-Raman lines emission concomitant with high-order harmonic generation

et al. 2019

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Hyper-Raman lines (HRL) resulting from strong-field light-matter interaction have been predicted theoretically in the 1990s but never identified in high-order harmonic generation experiments. Here, we use a combination of 800 and 400 nm laser pulses to control independently the two processes required for the hyper-Raman emission: creation of a coherence between two electronic states and laser-dressing of these states. As a result we observe simultaneously high-order harmonics, XUV free induction decay and HRL. We investigate experimentally and numerically the properties of this novel emission source. It can be of high interest, amongst others, for high-resolution spatio-temporal spectroscopy of excited electronic states in the same fashion high-order harmonics generation provides it for ground state.

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Section: Spatial Structuresupporting

confidence: 78%

Hyper-Raman lines emission concomitant with high-order harmonic generation

et al. 2019

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“…The harmonic generation process can be described by a very simple model [22] where the source term for a given harmonic number q and trajectory class (short or long) is written in the spatio-temporal domain at the interaction point as…”

Section: A Atomic Phase Modelmentioning

confidence: 99%

“…There has been a large number of reports of the spatiospectral features of HHG, including various physical effects such as multiple quantum paths interference [17][18][19][20], Maker fringes related to phase-matching effects [21], and space-time atomic dipole phase [22]. These works have been done with Ti:Sa systems at a central wavelength of 800 nm.…”

Section: Introductionmentioning

confidence: 99%

Spatio-spectral structures in high harmonic generation driven by tightly focused high repetition rate lasers

et al. 2018

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We investigate the spatio-spectral properties of extreme ultraviolet (XUV) high harmonic radiation driven by high repetition rate femtosecond laser systems. In the spatio-spectral domain, ring-shaped structures at each harmonic order associated with long-trajectory electrons are found to form arrow-shaped structures at the cutoff. These structures are observed with two different laser systems: an optical parametric chirped-pulse amplifier system at a central wavelength of 1.55 μm and 125 kHz repetition rate, and a temporally compressed femtosecond ytterbium fiber amplifier at 1.03 μm wavelength and 100 kHz repetition rate. As recently pointed out, the observed structures are well explained by considering the space-time atomic dipole-induced phase for short and long electron trajectories in the generation plane. The tighter focusing geometry and longer wavelength associated with these emerging driving laser systems increase the ring-like divergence and spectral broadening for high harmonics. Cutoff energies and photon fluxes obtained in argon and neon are also reported. Overall, these results shed new light on the properties of XUV radiation driven by these recently developed high average power laser systems, paving the way to high photon-flux XUV beamlines.

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“…Note added in proof. After acceptance of this article, we became aware of recent related work: [45].…”

Section: Acknowledgmentsmentioning

confidence: 99%

Spatially and spectrally resolved quantum path interference with chirped driving pulses

et al. 2016

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We measure spectrally and spatially resolved high-order harmonics generated in argon using chirped multi-cycle laser pulses. Using a stable, high-repetition rate laser we observe detailed interference structures in the far-field. The structures are of two kinds; off-axis interference from the long trajectory only and on-axis interference including the short and long trajectories. The former is readily visible in the far-field spectrum, modulating both the spectral and spatial profile. To access the latter, we vary the chirp of the fundamental, imparting different phases on the different trajectories, thereby changing their relative phase. Using this method together with an analytical model, we are able to explain the on-axis behaviour and access the dipole phase parameters for the short (a s ) and long (a l ) trajectories. The extracted results compare very well with phase parameters calculated by solving the time-dependent Schrödinger equation. Going beyond the analytical model, we are also able to successfully reproduce the off-axis interference structure.

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Complex structure of spatially resolved high-order-harmonic spectra

Abstract: International audienc

Cited by 48 publications

References 48 publications

Hyper-Raman lines emission concomitant with high-order harmonic generation

Hyper-Raman lines emission concomitant with high-order harmonic generation

Spatio-spectral structures in high harmonic generation driven by tightly focused high repetition rate lasers

Spatially and spectrally resolved quantum path interference with chirped driving pulses

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