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Article
Open AccessAttosecond intra-valence band dynamics and resonant-photoemission delays in W(110)
Time-resolved photoelectron spectroscopy with attosecond precision provides new insights into the photoelectric effect and gives information about the timing of photoemission from different electronic states w...
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Article
Open AccessNonlinear ionization dynamics of hot dense plasma observed in a laser-plasma amplifier
Understanding the behaviour of matter under conditions of extreme temperature, pressure, density and electromagnetic fields has profound effects on our understanding of cosmologic objects and the formation of ...
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Article
Open AccessWater-Window X-Ray Pulses from a Laser-Plasma Driven Undulator
Femtosecond (fs) x-ray pulses are a key tool to study the structure and dynamics of matter on its natural length and time scale. To complement radio-frequency accelerator-based large-scale facilities, novel la...
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Chapter and Conference Paper
Ptychography and Single-Shot Nanoscale Imaging with Plasma-Based Laser Sources
We report the direct wavefront characterization of an intense ultrafast high-harmonic seeded soft X-ray laser at 32.8 nm wavelength and monitor the exit of the laser plasma amplifier depending on the arrival t...
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Article
Open AccessHigh-flux ultrafast extreme-ultraviolet photoemission spectroscopy at 18.4 MHz pulse repetition rate
Laser-dressed photoelectron spectroscopy, employing extreme-ultraviolet attosecond pulses obtained by femtosecond-laser-driven high-order harmonic generation, grants access to atomic-scale electron dynamics. L...
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Chapter and Conference Paper
Coherent Diffraction Imaging with Tabletop XUV Sources
Coherent diffraction imaging (CDI) at wavelengths in the extreme ultraviolet range has become an important tool for nanoscale investigations. Employing laser-driven high harmonic sources allows for lab-scale a...
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Article
Open AccessTransverse Coherence Limited Coherent Diffraction Imaging using a Molybdenum Soft X-ray Laser Pumped at Moderate Pump Energies
Coherent diffraction imaging (CDI) in the extreme ultraviolet has become an important tool for nanoscale investigations. Laser-driven high harmonic generation (HHG) sources allow for lab scale applications suc...
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Article
Open AccessLaser intensity effects in carrier-envelope phase-tagged time of flight-photoemission electron microscopy
A time of flight-photoemission electron microscope is combined with a single-shot stereographic above-threshold ionization phase meter for studying attosecond control of electrons in tailored plasmonic nanostr...
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Article
Direct observation of electron propagation and dielectric screening on the atomic length scale
Attosecond light pulses are now available experimentally, enabling ultrafast processes on the atomic scale to be probed; here the free-electron-like propagation of electrons through ultrathin layers of magnesi...
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Article
Open AccessReal-time and Sub-wavelength Ultrafast Coherent Diffraction Imaging in the Extreme Ultraviolet
Coherent Diffraction Imaging is a technique to study matter with nanometer-scale spatial resolution based on coherent illumination of the sample with hard X-ray, soft X-ray or extreme ultraviolet light deliver...
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Article
Subfemtosecond steering of hydrocarbon deprotonation through superposition of vibrational modes
Subfemtosecond control of the breaking and making of chemical bonds in polyatomic molecules is poised to open new pathways for the laser-driven synthesis of chemical products. The break-up of the C-H bond in h...
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Chapter and Conference Paper
Sub-100-as soft x-ray pulses
We demonstrate the generation of powerful sub-100-as soft x-ray pulses by means of 1.5-cycle waveform-controlled laser fields. Our new tool opens the door for exploring electronic processes on a time scale app...
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Article
Attosecond spectroscopy in condensed matter
Electrons move in solids at very high speed — traversing atomic layers and interfaces within tens to hundreds of attoseconds (an attosecond is a billionth of a billionth of a second). These astonishingly brief...
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Article
Attosecond real-time observation of electron tunnelling in atoms
Atoms exposed to intense light lose one or more electrons and become ions. In strong fields, the process is predicted to occur via tunnelling through the binding potential that is suppressed by the light field...
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Chapter and Conference Paper
Chirped Multilayer Soft X-Ray Mirrors for Attosecond Soft X-Ray Pulses
Aperiodic XUV multilayer coatings with broad spectral bandwidth and flat dispersion characteristics have been developed and fabricated as reflecting and spectrally filtering optical elements for attosecond XUV...
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Article
Atomic transient recorder
In Bohr's model of the hydrogen atom, the electron takes about 150 attoseconds (1 as = 10-18 s) to orbit around the proton, defining the characteristic timescale for dynamics in the electronic shell of atoms. Rec...
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Chapter
Application of High-Harmonic Radiation for EUV Interferometry and Spectroscopy
We present the setup of a high-harmonic-beamline providing radiation in the 100 eV regime by nonlinear-frequency conversion of a 1 kHz, table-top 7 fs-laser system (high-harmonic generation). The beamline cons...
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Chapter
Time-Resolved Inner Shell Spectroscopy with Sub-fs EUV Pulses
Ultrashort high harmonics are applied for a time-domain tracking of decaying atomic inner-shell vacancies. The novel EUV-pump / laser-probe scheme utilizes the delay-dependent momentum exchange between photoem...
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Chapter
Reproducible Generation and Measurement of Isolated Sub-fs XUV Pulses with Phase-Controlled Few-Cycle Light
We report on the use of intense phase-controlled few-cycle(5-fs @ 750 nm)pulses for the reproducible generation of high-order-harmonic-like XUV radiation near 100 eV and for measuring the temporal structure of...
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Chapter
Multilayer EUV Optics for Applications of Ultrashort High Harmonic Pulses
Multilayers serve as tailored optical components for guiding, focussing, and monochromatization of high harmonics. A single harmonic order can be selected without pulse broadening thus enabling time-resolved p...
