Compact 200 kHz HHG source driven by a few-cycle OPCPA

Harth, Anne; Guo, Chen; Cheng, Yu-Chen; Losquin, Arthur; Miranda, Miguel; Mikaelsson, Sara; Heyl, Christoph M.; Prochnow, Oliver; Ahrens, Jan; Morgner, Uwe; L’Huillier, Anne; Arnold, Cord L.

doi:10.1088/2040-8986/aa9b04

Cited by 63 publications

(56 citation statements)

References 36 publications

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“…This article both summarizes and extends the previous work [14,15]. The laser system, located at the Lund High-Power Facility of the Lund Laser Centre, is based on optical parametric chirped pulse amplification (OPCPA), providing sub-6fs long pulses with stabilized carrier-to-envelope phase (CEP) in the nearinfrared (IR) with up to 15 μJ pulse energy at a repetition rate of 200 kHz [14]. The 200-fold increase in repetition rate, compared to standard 1 kHz systems, promotes experiments with high demands on statistics.…”

Section: Introductionsupporting

confidence: 82%

“…Here, we present a high-repetition rate, flexible attosecond light source, particularly designed for the study of gas phase correlated electron dynamics, as well as timeresolved nanoscale imaging. This article both summarizes and extends the previous work [14,15]. The laser system, located at the Lund High-Power Facility of the Lund Laser Centre, is based on optical parametric chirped pulse amplification (OPCPA), providing sub-6fs long pulses with stabilized carrier-to-envelope phase (CEP) in the nearinfrared (IR) with up to 15 μJ pulse energy at a repetition rate of 200 kHz [14].…”

Section: Introductionmentioning

confidence: 80%

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A high-repetition rate attosecond light source for time-resolved coincidence spectroscopy

et al. 2020

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Attosecond pulses, produced through high-order harmonic generation in gases, have been successfully used for observing ultrafast, subfemtosecond electron dynamics in atoms, molecules and solid state systems. Today’s typical attosecond sources, however, are often impaired by their low repetition rate and the resulting insufficient statistics, especially when the number of detectable events per shot is limited. This is the case for experiments, where several reaction products must be detected in coincidence, and for surface science applications where space charge effects compromise spectral and spatial resolution. In this work, we present an attosecond light source operating at 200 kHz, which opens up the exploration of phenomena previously inaccessible to attosecond interferometric and spectroscopic techniques. Key to our approach is the combination of a high-repetition rate, few-cycle laser source, a specially designed gas target for efficient high harmonic generation, a passively and actively stabilized pump-probe interferometer and an advanced 3D photoelectron/ion momentum detector. While most experiments in the field of attosecond science so far have been performed with either single attosecond pulses or long trains of pulses, we explore the hitherto mostly overlooked intermediate regime with short trains consisting of only a few attosecond pulses. We also present the first coincidence measurement of single-photon double-ionization of helium with full angular resolution, using an attosecond source. This opens up for future studies of the dynamic evolution of strongly correlated electrons.

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Section: Introductionsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 80%

A high-repetition rate attosecond light source for time-resolved coincidence spectroscopy

et al. 2020

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“…1c. Our laser system [33] is based on an ultrabroadband titanium-sapphire oscillator capable of delivering sub-6-fs pulses. The oscillator pulses are amplified in an optical parametric chirped pulse amplifier employing beta barium borate (BBO) crystals.…”

Section: Introductionmentioning

confidence: 99%

Few-cycle lightwave-driven currents in a semiconductor at high repetition rate

Langer¹,

Liu²,

Ren³

et al. 2020

Optica

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When an intense, few-cycle light pulse impinges on a dielectric or semiconductor material, the electric field will interact nonlinearly with the solid, driving a coherent current. An asymmetry of the ultrashort, carrier-envelope-phase-stable waveform results in a net transfer of charge, which can be measured by macroscopic electric contact leads. This effect has been pioneered with extremely short, single-cycle laser pulses at low repetition rate, thus limiting the applicability of its potential for ultrafast electronics. We investigate lightwave-driven currents in gallium nitride using few-cycle laser pulses of nearly twice the duration and at a repetition rate two orders of magnitude higher than in previous work. We successfully simulate our experimental data with a theoretical model based on interfering multiphoton transitions, using the exact laser pulse shape retrieved from dispersion-scan measurements. Substantially increasing the repetition rate and relaxing the constraint on the pulse duration marks an important step forward towards applications of lightwave-driven electronics.

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“…Historically, the peak intensities necessary for high-flux or high-photon-energy HHG, typically > 10 14 W/cm 2 , have meant that viable laser systems were limited to amplifiers bottle-necked to less than 10 kHz repetition rates. Although other methods such as enhancement cavities [24][25][26] or tight-focusing geometries with lower pulse power [27][28][29][30] have achieved HHG at higher repetition rates, both methods introduce additional experimental challenges that can limit their applicability. The Extreme Light Infrastructure Attosecond Light Pulse Source (ELI-ALPS) facility [31] has been constructed in order to push the frontiers of attosecond science.…”

Section: Introductionmentioning

confidence: 99%

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

Hammerland

Zhang

Kühn

et al. 2019

J. Phys. B: At. Mol. Opt. Phys.

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Attosecond Pulse Trains (APT) generated by high-harmonic generation (HHG) of high-intensity near-infrared (IR) laser pulses have proven valuable for studying the electronic dynamics of atomic and molecular species. However, the high intensities required for high-photon-energy, high-flux HHG usually limit the class of adequate laser systems to repetition rates below 10 kHz. Here, APT's generated from the 100 kHz, 160 W, 40 fs laser system (HR1) of the Extreme Light Infrastructure Attosecond Light Pulse Source (ELI-ALPS) are reconstructed using the Reconstruction of Attosecond Beating By Interference of two-photon Transitions (RABBIT) technique. These experiments constitute the first attosecond time-resolved photoelectron spectroscopy measurements performed at 100 kHz repetition rate and the first attosecond experiments performed at ELI-ALPS. These RABBIT measurements were taken with an additional IR field temporally locked to the extremeultraviolet APT, resulting in an atypical ω beating. We show that the phase of the 2ω beating recorded under these conditions is strictly identical to that observed in standard RABBIT measurements within second-order perturbation theory. This work highlights an experimental simplification for future experiments based on attosecond interferometry (or RABBIT), which is particularly useful when lasers with high average powers are used.

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Compact 200 kHz HHG source driven by a few-cycle OPCPA

Cited by 63 publications

References 36 publications

A high-repetition rate attosecond light source for time-resolved coincidence spectroscopy

A high-repetition rate attosecond light source for time-resolved coincidence spectroscopy

Few-cycle lightwave-driven currents in a semiconductor at high repetition rate

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

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