Daniel Walke
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View article: High-average-power, few-cycle, 2.1 µm OPCPA laser driver for soft-X-ray high-harmonic generation
High-average-power, few-cycle, 2.1 µm OPCPA laser driver for soft-X-ray high-harmonic generation Open
Repetition-rate upscaling of intense, femtosecond-duration pulses in the short-wave infrared is necessary to further develop and apply tabletop, ultrafast soft-X-ray sources. Here, we present a 20 fs-pulse-duration, 2.1 µm-central-waveleng…
View article: Sub-10-fs observation of bound exciton formation in organic optoelectronic devices
Sub-10-fs observation of bound exciton formation in organic optoelectronic devices Open
Fundamental mechanisms underlying exciton formation in organic semiconductors are complex and elusive as it occurs on ultrashort sub-100-fs timescales. Some fundamental aspects of this process, such as the evolution of exciton binding ener…
View article: Correlation-Driven Transient Hole Dynamics Resolved in Space and Time in the Isopropanol Molecule
Correlation-Driven Transient Hole Dynamics Resolved in Space and Time in the Isopropanol Molecule Open
The possibility of suddenly ionized molecules undergoing extremely fast electron hole dynamics prior to significant structural change was first recognized more than 20 years ago and termed charge migration. The accurate probing of ultrafas…
View article: Generation and measurement of isolated attosecond pulses with enhanced flux using a two colour synthesized laser field
Generation and measurement of isolated attosecond pulses with enhanced flux using a two colour synthesized laser field Open
We have generated isolated attosecond pulses and performed attosecond streaking measurements using a two-colour synthesized laser field consisting of a strong near-infrared few-cycle pulse and a weaker multi-cycle pulse centred at 400 nm. …
View article: Hard X-ray induced fast secondary electron cascading processes in solids
Hard X-ray induced fast secondary electron cascading processes in solids Open
Recent studies confirmed that the materials used in the extreme UV and soft X-ray regime for precise characterization of intense free-electron laser pulses (e.g., Si3N4) do not work efficiently in the hard X-ray regime, which is due to the…
View article: Chirp-control of resonant high-order harmonic generation in indium ablation plumes driven by intense few-cycle laser pulses
Chirp-control of resonant high-order harmonic generation in indium ablation plumes driven by intense few-cycle laser pulses Open
We have studied high-order harmonic generation (HHG) in an indium ablation plume driven by intense few-cycle laser pulses centered at 775 nm as a function of the frequency chirp of the laser pulse. We found experimentally that resonant emi…
View article: Accurate prediction of X-ray pulse properties from a free-electron laser using machine learning
Accurate prediction of X-ray pulse properties from a free-electron laser using machine learning Open
Free-electron lasers providing ultra-short high-brightness pulses of X-ray radiation have great potential for a wide impact on science, and are a critical element for unravelling the structural dynamics of matter. To fully harness this pot…
View article: New instrumentation and methods for ultrafast pump-probe spectroscopy
New instrumentation and methods for ultrafast pump-probe spectroscopy Open
Recent advances have led to the demonstration of trains of attosecond pulses and isolated attosecond pulses in the vacuum ultraviolet (VUV) and extreme ultraviolet (XUV) regions of the electromagnetic spectrum in a number of laboratories. …