Reconstruction of attosecond pulses in the presence of interfering dressing fields using a 100 kHz laser system at ELI-ALPS

Hammerland, Daniel; Zhang, Pengju; Kühn, Sergei; Jójárt, Péter; Seres, Imre; Zuba, Viktor; Várallyay, Zoltán; Charalambidis, D.; Osvay, K.; Luu, Tran Trung; Wörner, Hans Jakob

doi:10.1088/1361-6455/ab486c

Cited by 14 publications

(13 citation statements)

References 57 publications

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“…The laser pulses were ∼40 fs in duration with a central wavelength of 1030 nm. The XUV mirror reflectivity was centered around 44 eV and had a bandwidth of ∼7 eV [25]. A notable difference between our measurements and previous efforts [4,19] is the utilization of a field-free time-of-flight spectrometer with an incorporated electromagnetic coil inside the time-of-flight tube to guide the electrons onto the multi-channel plate detector as opposed to a magnetic-bottle spectrometer.…”

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confidence: 85%

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Effect of electron correlations on attosecond photoionization delays in the vicinity of the Cooper minima of argon

Hammerland¹,

Zhang²,

Bray³

et al. 2019

Preprint

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Attosecond photoionization delays have mostly been interpreted within the single-particle approximation of multi-electron systems. The strong electron correlation between the photoionization channels associated with the 3p and 3s orbitals of argon presents an interesting arena where this single-particle approximation breaks down. Around photon energies of 42 eV, the 3s photoionization channel of argon experiences a "Cooper-like" minimum, which is exclusively the result of inter-electronic correlations with the 3p shell. Photoionization delays around this "Cooper-like" minimum have been predicted theoretically, but experimental verification has remained a challenge since the associated photoionization cross section is inherently very low. Here, we report the measurement of photoionization delays around the Cooper-like minimum that were acquired with the 100 kHz High-Repetition 1 laser system at the ELI-ALPS facility. We report relative photoionization delays reaching up to unprecedented values of 430±20 as, as a result of electron correlation. Our experimental results are in partial agreement with state-of-the-art theoretical results, but also demonstrate the need for additional theoretical developments.

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confidence: 85%

“…This enabled an increased collection efficiency without averaging over all emission angles, which has been predicted to greatly affect the measured delay [11,26]. For further details on the experimental setup, see [25,27].…”

mentioning

confidence: 99%

Effect of electron correlations on attosecond photoionization delays in the vicinity of the Cooper minima of argon

Hammerland¹,

Zhang²,

Bray³

et al. 2019

Preprint

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“…The observed gas-phase HHG originates entirely from the gas phase located behind the flatjet because the high-harmonic radiation created in front of the jet is completely absorbed, given the typical absorption lengths of ∼10 nm at 20 eV [85]. This natural separation of HHG has several immediate benefits, which include the possibility to perform HHS experiments on the gas and liquid phases simultaneously and the separation of generated high harmonics from the driving fields, which could become relevant for high-average-power attosecond [86] or XUV-frequency-comb [87] experiments.…”

Section: Experimental Methodsmentioning

confidence: 99%

Attosecond Dynamics in Liquids

Wörner¹,

Schild²,

Jelovina³

et al. 2020

Preprint

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Attosecond science is well developed for atoms and promising results have been obtained for molecules and solids. Here, we review the first steps in developing attosecond time-resolved measurements in liquids. These advances provide access to time-domain studies of electronic dynamics in the natural environment of chemical reactions and biological processes. We concentrate on two techniques that are representative of the two main branches of attosecond science: pump-probe measurements using attosecond pulses and high-harmonic spectroscopy (HHS). In the first part, we discuss attosecond photoelectron spectroscopy with cylindrical microjets and its application to measure time delays between liquid and gaseous water. We present the experimental techniques, the new data-analysis methods and the experimental results. We describe in detail the conceptual and theoretical framework required to fully describe attosecond chronoscopy in liquids at a quantum-mechanical level. This includes photoionization delays, scattering delays, as well as a coherent description of electron transport and (laser-assisted) photoemission and scattering. As a consequence, we show that attosecond chronoscopy of liquids is, in general, sensitive to both types of delays, as well as the electron mean-free paths. Through detailed modeling, involving state-of-the-art quantum scattering and Monte-Carlo trajectory methods, we show that the photoionization delays dominate in attosecond chronoscopy of liquid water at photon energies of 20-30 eV. This conclusion is supported by a near-quantitative agreement between experiment and theory. In the second part, we introduce HHS of liquids based on flat microjets. These results represent the first observation of high-harmonic generation (HHG) in liquids extending well beyond the visible into the extreme-ultraviolet regime. We show that the cut-off energy scales almost linearly with the peak electric field of the driver and that the yield of all harmonics scales non-perturbatively. We also discuss the ellipticity dependence of the liquid-phase harmonics, which is systematically broadened compared to the gas phase. We introduce a strongly-driven few-band model as a zero-order approximation of HHG in liquids and demonstrate the sensitivity of HHG to the electronic structure of liquids. Finally, we discuss future possibilities for modelling liquid-phase HHG, building on the methods introduced in the first part of this chapter. In the conclusion, we present an outlook on future studies of attosecond dynamics in liquids.

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“…It is worth mentioning that a fiber-based CPA in combination with nonlinear compression in HCFs has been presented as the method of choice at the extreme light infrastracture (ELI) facility for providing CEP-stable, few-cycle pulses with high average power and high repetition rate for experiments in attosecond science [76,77]. Recently, one of these systems at ELI, featuring one compression stage, was utilized to generate APTs and perform pump-probe experiments [78][79][80].…”

Section: Post-compression Of High Power Cpasmentioning

confidence: 99%

High power, high repetition rate laser-based sources for attosecond science

Furch¹,

Witting²,

Osolodkov³

et al. 2022

J. Phys. Photonics

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Within the last two decades attosecond science has been established as a novel research ﬁeld providing insights into the ultrafast electron dynamics that follows a photoexcitation or photoionization process. Enabled by technological advances in ultrafast laser ampliﬁers, attosecond science has been in turn, a powerful engine driving the development of novel sources of intense ultrafast laser pulses. This article focuses on the development of high repetition rate laser-based sources delivering high energy pulses with a duration of only a few optical cycles, for applications in attosecond science. In particular, a high power, high repetition rate optical parametric chirped pulse ampliﬁcation system is described, which was developed to drive an attosecond pump-probe beamline targeting photoionization experiments with electron-ion coincidence detection at high acquisition rates.

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Reconstruction of attosecond pulses in the presence of interfering dressing fields using a 100 kHz laser system at ELI-ALPS

Cited by 14 publications

References 57 publications

Effect of electron correlations on attosecond photoionization delays in the vicinity of the Cooper minima of argon

Effect of electron correlations on attosecond photoionization delays in the vicinity of the Cooper minima of argon

Attosecond Dynamics in Liquids

High power, high repetition rate laser-based sources for attosecond science

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