Sub-cycle ionization dynamics revealed by trajectory resolved, elliptically-driven high-order harmonic generation

Larsen, Esben W.; Carlström, Stefanos; Lorek, Eleonora; Heyl, Christoph M.; Paleček, David; Schafer, Kenneth J.; L’Huillier, Anne; Zigmantas, Donatas; Mauritsson, Johan

doi:10.1038/srep39006

Cited by 11 publications

(20 citation statements)

References 55 publications

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“…In a more proper quantum mechanical picture, the extension of the wavefunction of the returning electron results in HHG signal decay as a function of the driver pulse ellipticity [18,19] with the recollision process being less likely for increasing ellipticity. Recent experiments defined the threshold ellipticity (ε th ) as the half-FWHM of this decay [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

High harmonic generation on noble gas clusters

et al. 2019

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High order harmonics (HHG) were generated on noble gas cluster targets with different cluster sizes. The independently characterized cluster sources enabled experimental investigation of the recombination mechanism. HHG spectra were recorded for different backing pressures and gases (Ar, Xe) as a function of driver pulse ellipticity. Since the ellipticity-dependent HHG decay is essentially the same for the different gas-pressure pairs, we can conclude that the recombination process is dominated by atom-to-itself recollisions irrespective of cluster size and material.

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Section: Introductionmentioning

confidence: 99%

High harmonic generation on noble gas clusters

et al. 2019

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“…[40] This would also affect the recombination process to produce HHG, including the delay time between ionization and recombination. In their study, Larsen et al [41] have shown that the electron excursion time τ of HHG, corresponding with the delay time between ionization and recombination, would be changed upon varying laser ellipticity ε. This fact would in turn affect the position of the dynamic interference minimum, since it is related to the excursion time τ.…”

Section: Resultsmentioning

confidence: 99%

Quantum interference of multi-orbital effects in high-harmonic spectra from aligned carbon dioxide and nitrous oxide*

et al. 2019

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We investigate experimentally multi-orbital effects in high-order harmonic generation (HHG) from aligned CO2 and N2O molecules by intense femtosecond laser fields with linear and elliptical polarizations. For either of the aligned molecules, a minimum in the harmonic spectrum is observed, the position of which shifts to lower-order harmonics when decreasing the intensity or increasing the ellipticity of the driving laser. This indicates that the minimum originates from the dynamic interference of different channels, of which the tunneling ionization and recombination are contributed via different molecular orbitals. The results show that both the highest occupied molecular orbital (HOMO) and low-lying HOMO-2 in CO2 (or HOMO-1 in N2O) contribute to the molecular HHG in both linearly and elliptically polarized strong laser fields. Our study would pave a way for understanding multi-electron dynamics from polyatomic molecules irradiated by strong laser fields.

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“…The temporal characterisation over a range of 18 − 25eV photon energy is important for studies on the absorption mechanisms in condensed matter such as photoionization of outer valence band electrons, inner electron ionization and Auger transitions. As shown in [38], due to the increased observation time-window provided, the long path high-harmonics are important for HHG spectroscopic studies of molecular dynamics, of relevance to decoherence studies [40]. Our approach based on the combination of scaling invariant loose focusing geometry, two-colour field control, phase matching optimization and far field selection opens perspectives towards the generation of intense XUV pulses with controllable spectral phase distribution.…”

Section: Discussionmentioning

confidence: 99%

Temporal characterization of long quantum-path high harmonics

Carpeggiani¹,

Bódi²,

Skantzakis³

et al. 2021

Preprint

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We measure for the first time the duration of long-quantum path EUV high harmonics produced in xenon gas. The long-quantum path contribution to the high-harmonic signal was carefully controlled by employing a two-colour driving laser field and a high-harmonic spatial selection in the far field, over a range of 18−25 eV in photon energy. To characterise the temporal profile of long quantum path high harmonics, we performed a second order volume autocorrelation (2 − IV AC) via two EUV photon double ionization in argon. Our results show the production and characterisation of a train of EUV pulses from the longpath with pulse duration as short as 1.4 f s. This measurement demonstrates that the long-quantum path emission can have enough flux for performing non-linear EUV experiments, and that the long trajectories enable a pulse duration short enough to support measurements with a temporal resolution below 2 f s.

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Sub-cycle ionization dynamics revealed by trajectory resolved, elliptically-driven high-order harmonic generation

Cited by 11 publications

References 55 publications

High harmonic generation on noble gas clusters

High harmonic generation on noble gas clusters

Quantum interference of multi-orbital effects in high-harmonic spectra from aligned carbon dioxide and nitrous oxide*

Temporal characterization of long quantum-path high harmonics

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