33 Dokumente gefunden
Efficient high-resolution microscopic ghost imaging via sequenced speckle illumination and deep learning from a single noisy…
This study presents a novel approach for achieving high-quality and large-scale microscopic ghost imaging by integrating deep learning-based denoising with computational ghost imaging techniques. By utilizing sequenced random speckle patterns of optimized sizes, we reconstructed large noisy images with…
Erschienen: Frontiers Media S.A., 2025-06-24
High harmonic generation in nanoscale solids
This dissertation investigates high-harmonic generation (HHG) in nanoscale solids, emphasising electron–phonon interactions as key drivers of ultrafast dephasing and exploring nanophotonic routes to enhance nonlinear response. We measure the wavelength scaling of HHG in monolayer WS₂ and MoS₂ and in…
Hot and dense plasma generation by relativistic interaction of ultra-short laser pulses with solid targets
Advances in nanoscience and technology have enabled nanoscale structuring of solid targets, dramatically improving laser energy deposition into matter. The interaction of relativistically intense, ultrafast laser pulses with high-aspect-ratio nanostructures can volumetrically heat matter to ultra-high-energy-density…
Tunable high-order harmonic generation in GeSbTe nano-films
aus: Nanophotonics
High-order harmonic generation (HHG) in solids opens new frontiers in ultrafast spectroscopy of carrier and field dynamics in condensed matter, picometer resolution structural lattice characterization and designing compact platforms for attosecond pulse sources. Nanoscale structuring of solid surfaces…
Berlin: De Gruyter, 2024-04-18
Exploring and pushing the boundaries of tunable and waveguide-based high harmonic sources
Current HHG experiments often face at least one of the following problems: low photon flux, long integration times, and a fixed harmonic comb structure that may not cover all desired photon energies. Tunable HHG sources have been developed, but suffer from moderate photon flux, incomplete spectral coverage,…
Tunable soliton-based supercontinuum generation in liquid-core optical fibers
This work presents the results of temperature-based control of supercontinuum generation in liquid-core step-index fibers. The key parameter adapted via temperature is the group velocity dispersion of the fiber modes, which determines the nonlinear pulse dynamics. Different soliton dynamics, e.g. fission,…
Image-Enhanced Pseudo-Thermal Ghost Imaging with Hybrid Speckle Pattern
aus: Photonics
In this study, the influence of hybrid speckle patterns on the contrast-to-noise ratio (CNR) and resolution in pseudo-thermal ghost imaging (PGI) was examined based on the object dimensions in the macroscopic and microscopic regimes. This research shows that an enhanced scaling of the ghost image CNR…
Basel: MDPI, 2023-06-21
Ultra-high efficiency bremsstrahlung production in the interaction of direct laser-accelerated electrons with high-Z material
aus: Frontiers in physics
High performance of laser-driven sources of radiation is in focus of research aimed at the study of high energy density matter, pair production and neutron generation using kJ PW-laser systems. In this work, we present a highly efficient approach to generate an ultra-high flux, high-energy bremsstrahlung…
Lausanne: Frontiers Media, 2023-05-09
A review of high‐resolution microscopic ghost imaging with a low‐dose pseudothermal light
High‐resolution imaging is an important issue in various fields of scientific researches and engineering applications. Pseudothermal ghost imaging is one of the subfields of quantum imaging, providing new capabilities beyond conventional imaging methods. Also, it can provide a new viewpoint of imaging…
Oxford [u.a.]: Wiley-Blackwell, 2021-09-15
1. Vorlesung (07.12.2020): Das Photon - Was ist die Natur des Lichts?
Vorlesungsinhalt: Elektromagnetische Lichttheorie; Strahlung von heißen Körpern; Hohlraumstrahlung; Temperatur auf der Sonne; Das Rayleigh´sche Strahlungsgesetz; Klassische Strahlungsgesetze; Experiment zum Photoeffekt; Hybride
10. Vorlesung (15.06.2020): Spectroscopic Instrumentation - Part 2
Content: Michelson Interferometer; Fabry-Perot Interferometer and other Interferometer; Comparison resolution
9. Vorlesung (13.06.2020): Spectroscopic Instrumentation - Part 1
Content: Fundamentals; Prim spectrometer; Grating spectrometer
8. Vorlesung (10.06.2020): Vibration and Rotation in Moleculars, Frank Condon Principle and Raman effect
Content: Molecular absorption; Motion in atoms and molecules; Rotational States; Vibrational States; Vibration and Rotation Combined; Application of IR spectroscopy; Electronic transitions; Raman spectroscopy; Comparison of Raman and IR Spectra; IR vs. Raman spectroscopy
7. Vorlesung (29.05.2020): From Atoms to Molecules
Content: Molecules; H2 molecule; Molecular Bonding and Spectra; Molecular Bonds; Delocalization; Binding vs energy
6. Vorlesung (19.05.2020): Light-Matter Interaction with Quantum Mechanics X-rays
Content: X-ray spectra; Maximum x-ray photon energy; Accerlerated charges; Moving charge; Dipole emission; Bremsstrahlung spectra; x-ray absorption; Absorption spectroscopy; Spectroscopy of chemical compounds; X-ray Scattering; Pair creation
5. Vorlesung (12.05.2020): Multi electron atoms
Content: Atoms with many electrons; Ionization energy of elements; Energy levels of atoms; The Pauli Exclusion Principle; Atomic Structure; Groups and Periods; Total Angular Momentum; Fermions and Bosons
4. Vorlesung (11.05.2020): Light matter Interaction - Part 3
Content: Interaction of photons with matter; Black body radiation; Estimation of Einstein coefficients; Spectral line shape; Line broadening
1. Vorlesung (02.05.2020): Introduction
Content: Contents; Prerequisites; Schedule; Exams; Questions and Problems