Tabletop attosecond X-rays in the water window

Han, Seunghwoi; Li, Jie; Zhu, Zheyuan; Chew, Andrew; Larsen, Esben W.; Wu, Yi; Pang, Shuo; Chang, Zenghu

doi:10.1016/bs.aamop.2020.04.003

Cited by 6 publications

(2 citation statements)

References 161 publications

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“…The technology and phase-matching considerations for SXR HHG have been reviewed in detail in Refs. 96 and 97 .…”

Section: Time-resolved Soft X-ray Spectroscopymentioning

confidence: 99%

Toward ultrafast soft x-ray spectroscopy of organic photovoltaic devices

Garratt,

Matthews,

Marangos

2024

Structural Dynamics

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Novel ultrafast x-ray sources based on high harmonic generation and at x-ray free electron lasers are opening up new opportunities to resolve complex ultrafast processes in condensed phase systems with exceptional temporal resolution and atomic site specificity. In this perspective, we present techniques for resolving charge localization, transfer, and separation processes in organic semiconductors and organic photovoltaic devices with time-resolved soft x-ray spectroscopy. We review recent results in ultrafast soft x-ray spectroscopy of these systems and discuss routes to overcome the technical challenges in performing time-resolved x-ray experiments on photosensitive materials with poor thermal conductivity and low pump intensity thresholds for nonlinear effects.

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“…The technology and phase-matching considerations for SXR HHG have been reviewed in detail in Refs. 96 and 97 .…”

Section: Time-resolved Soft X-ray Spectroscopymentioning

confidence: 99%

Toward ultrafast soft x-ray spectroscopy of organic photovoltaic devices

Garratt,

Matthews,

Marangos

2024

Structural Dynamics

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“…High-order harmonic generation (HHG) resulting from the interaction of intense laser pulses with a gaseous medium has become a promising tabletop coherent attosecond light source spanning from the extreme-ultraviolet (XUV) to water window X-ray [1][2][3][4][5][6][7][8][9]. With such light sources, many ultrafast processes, such as ultrafast electronic dynamics inside atoms, time-resolved X-ray absorption fine structure spectroscopy, and nanoscale transient gratings excitation can be observed [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Enhanced XUV Harmonics Generation with an Intense Laser Field in the Overdriven Regime

Qin,

Xu,

et al. 2023

Photonics

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High-order harmonic generation with high photon flux has been a challenging task in strong-field physics. According to the high-order harmonic generation process, the essential requirements for achieving efficient harmonic radiations inside a gas medium are the improvement of the induced atomic dipole moment amplitude of the single-atom response in the microscopic and the phase matching of the high harmonics in the macroscopic medium. In this work, we demonstrated a feasible approach to enhance the extreme-ultraviolet harmonics in the plateau region by increasing the intensity of the driving laser while keeping the laser energy constant. The simulation results showed that by increasing the laser intensity to the overdriven regime, the average extreme-ultraviolet harmonics yield in the plateau region is approximately twice as high as that obtained optimally in the conventional loose focusing geometry scheme by utilizing a relatively low-intensity driving laser with the same laser energy. The quantitative analysis of the harmonics generation process in the macroscopic medium and the phase matching revealed that the observed enhancement in harmonics can be attributed to the amplification of the induced atomic dipole moment amplitude of the single-atom response in the high-intensity driving laser and the favorable transient phase matching in the overdriven regime. Furthermore, the investigation of the driving laser indicated that the favorable transient phase matching is caused by the spatiotemporal reshaping of the driving laser in the overdriven regime.

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Generation of isolated soft x-ray attosecond pulses with mid-infrared driving lasers via transient phase-matching gating

Wang

Tang

et al. 2021

New J. Phys.

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Isolated attosecond pulses (IAPs) in the soft x-ray (SXR) region are highly desirable for attosecond time-resolved experiments. Here we identify a transient phase matching gating method for the generation of such IAPs with mid-infrared (MIR) lasers. This gating method works when a loosely focused, long-duration MIR Gaussian driving beam is slightly reshaped during its propagation in the gas medium under the ‘critical’ ionization condition. Quantitatively, the calculated coherence length of high harmonic is used to analyze the mechanism of the gating method, by using one-dimensional plane-wave beams and by comparing 2000 nm and 800 nm lasers. The robustness of the generation method is checked by varying laser’s carrier-envelope-phase and gas pressure. This gating method provides with an alternative route to efficiently produce tabletop ultrashort attosecond SXR light sources with the emerging MIR lasers.

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Tabletop attosecond X-rays in the water window

Cited by 6 publications

References 161 publications

Toward ultrafast soft x-ray spectroscopy of organic photovoltaic devices

Toward ultrafast soft x-ray spectroscopy of organic photovoltaic devices

Enhanced XUV Harmonics Generation with an Intense Laser Field in the Overdriven Regime

Generation of isolated soft x-ray attosecond pulses with mid-infrared driving lasers via transient phase-matching gating

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