Marius Plach
A5059962137- Laser-Matter Interactions and Applications
- Advanced Fiber Laser Technologies
- Mass Spectrometry Techniques and Applications
- Spectroscopy and Quantum Chemical Studies
- Laser Design and Applications
- Laser-Plasma Interactions and Diagnostics
- Advanced Chemical Physics Studies
- Spectroscopy Techniques in Biomedical and Chemical Research
- Advanced Fluorescence Microscopy Techniques
- Ocular and Laser Science Research
- Laser-induced spectroscopy and plasma
- Light effects on plants
- Ion-surface interactions and analysis
Lund University
2021-2024
Many applications of the extreme ultraviolet (XUV) radiation obtained by high-order harmonic generation (HHG) in gases require a small focus area order to enable attosecond pulses reach high intensity. Here, harmonics generated Ar with multiterawatt laser system loose focusing geometry are focused few micrometers using two toroidal mirrors Wolter configuration demagnification factor. Using knife-edge measurement technique, we determine position and size XUV foci as function order. We show...
Photoionization of atoms and molecules is one the fastest processes in nature. The understanding ultrafast temporal dynamics this process often requires characterization different angular momentum channels over a broad energy range. Using two-photon interferometry technique based on extreme ultraviolet infrared ultrashort pulses, we measure phase amplitude individual as function kinetic outer-shell photoionization neon. This allows us to unravel influence channel interference well effect...
Attosecond pulses created by high-order harmonic generation in gases often exhibit strong chromatic aberrations, arising from the broad bandwidth and wavelength-dependent nonlinear light-matter interaction. When driving laser intensity varies spatially, as for Gaussian beams, apparent source position of harmonics differs significantly one order to next, thus affecting achievable duration attosecond when they are focused on a target. We show that these aberrations can be reduced spatially...
We investigate the spatial characteristics of high-order harmonic radiation generated in argon and observe cross-like patterns far field. An analytical model describing harmonics from an astigmatic driving beam reveals that these result order generation position-dependent divergence harmonics. Even small amounts field astigmatism may patterns, coming superposition individual with profiles elongated different directions. By correcting aberrations using a deformable mirror, we show fine-tuning...
High-order harmonic generation (HHG) provides scalable sources of coherent extreme ultraviolet radiation with pulse duration down to the attosecond time scale. Efficient HHG requires constructive interplay between microscopic and macroscopic effects in volume, which can be achieved over a large range experimental parameters from driving field properties those generating medium. Here, we present systematic study yield as function gas pressure medium length. Two regimes for optimum are...
We present an investigation of the ultrafast dynamics polycyclic aromatic hydrocarbon fluorene initiated by intense femtosecond near- infrared laser pulse (810 nm) and probed a weak visible (405 nm). Using multichannel detection scheme (mass spectra, electron ion velocity-map imaging), we provide full disentanglement complex vibronically excited parent molecule, its ionic states, fragments. observed various channels resulting from strong-field ionization regime. In particular, formation...
We present an investigation of the ultrafast dynamics polycyclic aromatic hydrocarbon fluorene initiated by intense femtosecond near- infrared laser pulse (810 nm) and probed a weak visible (405 nm). Using multichannel detection scheme (mass spectra, electron ion velocity-map imaging), we provide full disentanglement complex vibronically excited parent molecule, its ionic states, fragments. observed various channels resulting from strong-field ionization regime. In particular, formation...
We present an investigation of the ultrafast dynamics polycyclic aromatic hydrocarbon fluorene initiated by intense femtosecond near-infrared laser pulse (810 nm) and probed a weak visible (405 nm).
Ionization of atoms and molecules by absorption a light pulse results in electron wavepackets carrying information on the atomic or molecular structure as well dynamics ionization process. These can be described coherent sum waves given angular momentum, called partial waves, each characterized an amplitude phase. The complete characterization individual momentum components is experimentally challenging, requiring analysis interference between both energy angle. Using two-photon...
We demonstrate, using analytic models, simulations and experiments, that efficient generation of high-order harmonics is possible across a large range parameters, if the density medium length follow hyperbolic equation.
We investigate the spatial characteristics of high-order harmonic radiation generated in argon, and observe cross-like patterns far field. An analytical model describing harmonics from an astigmatic driving beam reveals that these result order generation position dependent divergence harmonics. Even small amounts field astigmatism may patterns, coming superposition individual with profiles elongated different directions. By correcting aberrations using a deformable mirror, we show...
We present an investigation of the ultrafast dynamics polycyclic aromatic hydrocarbon fluorene initiated by intense femtosecond infrared laser pulse and probed a weak visible pulse. Using multichannel detection scheme (mass spectra, electron ion velocity-map imaging), we provide full disentanglement complex vibronically excited parent molecule, its ionic states, fragments. observed channels resulting from both multiphoton- tunnel-ionization regimes. In particular, formation unstable...