Markus Drescher
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View article: Electron thermalization and ion acceleration in XUV-produced plasma from nanoparticles in He gas environment
Electron thermalization and ion acceleration in XUV-produced plasma from nanoparticles in He gas environment Open
We use intense femtosecond extreme ultraviolet (XUV) pulses with a photon energy of 92 eV from the FLASH free electron laser to irradiate substrate-free CsCl nanoparticles surrounded by a He gas with a number density of around 10 15 cm −3 …
View article: UV 30 fs laser pulse generation using a multi-pass cell
UV 30 fs laser pulse generation using a multi-pass cell Open
Ultrashort ultraviolet (UV) pulses are pivotal for resolving ultrafast electron dynamics. However, their efficient generation is strongly impeded by material dispersion and two-photon absorption, in particular, if pulse durations around a …
View article: Cooling dynamics of a free ion in a Bose-Einstein condensate
Cooling dynamics of a free ion in a Bose-Einstein condensate Open
We investigate the dynamics of an ion moving through a homogeneous Bose-Einstein condensate (BEC) after an initial momentum is imparted. For this, we derive a master equation in the weak-coupling limit and Lamb-Dicke approximation for the …
View article: Full characterization of a phase-locked DUV double pulse generated in an all-reflective shaping setup working under grazing incidence in a broad spectral range
Full characterization of a phase-locked DUV double pulse generated in an all-reflective shaping setup working under grazing incidence in a broad spectral range Open
Controlling the temporal and spectral properties of ultrashort laser pulses in the visible and near-infrared spectral range by means of a femtosecond pulse-shaping device is a powerful tool with many applications in ultrafast spectroscopy.…
View article: Deriving x-ray pulse duration from center-of-energy shifts in THz-streaked ionized electron spectra
Deriving x-ray pulse duration from center-of-energy shifts in THz-streaked ionized electron spectra Open
A fast and robust, yet simple, method has been developed for the immediate characterization of x-ray pulse durations via IR/THz streaking that uses the center of energy (COE) of the photoelectron spectrum for the evaluation. The manuscript…
View article: Field-enabled quantum interference in atomic Auger decay
Field-enabled quantum interference in atomic Auger decay Open
We demonstrate that an external terahertz (THz) field enables the formation of interference between two distinct Auger pathways leading to the same final ionic state. The kinetic energy of Auger electrons ejected from either of two spin-or…
View article: Single-shot temporal characterization of XUV pulses with duration from ∼10 fs to ∼350 fs at FLASH
Single-shot temporal characterization of XUV pulses with duration from ∼10 fs to ∼350 fs at FLASH Open
Ultra-short extreme ultraviolet pulses from the free-electron laser FLASH are characterized using terahertz-field driven streaking. Measurements at different ultra-short extreme ultraviolet wavelengths and pulse durations as well as numeri…
View article: THz streak camera performance for single-shot characterization of XUV pulses with complex temporal structures
THz streak camera performance for single-shot characterization of XUV pulses with complex temporal structures Open
The THz-field-driven streak camera has proven to be a powerful diagnostic-technique that enables the shot-to-shot characterization of the duration and the arrival time jitter of free electron laser (FEL) pulses. Here we investigate the per…
View article: Electronic decay of core-excited HCl molecules probed by THz streaking
Electronic decay of core-excited HCl molecules probed by THz streaking Open
The ultrafast electronic decay of HCl molecules in the time domain after resonant core excitation was measured. Here, a Cl-2p core electron was promoted to the antibonding σ* orbital initiating molecular dissociation, and simultaneously, t…
View article: VUV-induced dynamics of the electronically excited C2D4 molecule in a single-color pump-probe experiment
VUV-induced dynamics of the electronically excited C2D4 molecule in a single-color pump-probe experiment Open
The ultrafast non-adiabatic dynamics of the electronically excited ethylene molecule C2H4 and its deuterated isotopologue C2D4 are studied with time-resolved photoelectron spectroscopy after π→π∗ excitation via irradiation with light in th…
View article: Minimizing attosecond CEP jitter by carrier envelope phase tuning
Minimizing attosecond CEP jitter by carrier envelope phase tuning Open
Minimizing the CEP jitter of isolated attosecond pulses (IAP) will be important for future applications. This jitter is experimentally and theoretically investigated and can be minimized when the driving pulse is near its Fourier limit but…
View article: Seeding R at sFLASH
Seeding R at sFLASH Open
Free-electron lasers (FELs) based on the self-amplified spontaneous emission (SASE) principle generate photon pulses with typically poor longitudinal coherence. FEL seeding techniques greatly improve longitudinal coherence by initiating FE…
View article: Absolute strong-field ionization probabilities of ultracold rubidium atoms
Absolute strong-field ionization probabilities of ultracold rubidium atoms Open
Understanding strong-field ionization requires a quantitative comparison between experimental data and theoretical models which is notoriously difficult to achieve. Optically trapped ultracold atoms allow to extract absolute nonlinear ioni…
View article: Stabilizing isolated attosecond pulse formation by dispersion tuning
Stabilizing isolated attosecond pulse formation by dispersion tuning Open
The carrier envelop phase (CEP) of isolated attosecond pulses (IAPs) is\ntheoretically and experimentally investigated based on the assumption that a\nsignificant contribution originates from the measurable CEP jitter of the\ndriving laser…
View article: Status of Seeding Development at sFLASH
Status of Seeding Development at sFLASH Open
The experimental seeding setup at FLASH has operated now for two years in high-gain harmonic generation mode. Using a transverse deflecting structure downstream of the seeding section allows a temporal characterization of seeded electron b…
View article: Status of the sFLASH Experiment
Status of the sFLASH Experiment Open
The sFLASH experiment at the free-electron laser (FEL) FLASH1 is a setup for the investigation of external FEL seeding. Since 2015, the seeding scheme high-gain harmonic generation (HGHG) is being studied. At the end of the seeded FEL, an …
View article: Direct measurement of the pulse duration and frequency chirp of seeded XUV free electron laser pulses
Direct measurement of the pulse duration and frequency chirp of seeded XUV free electron laser pulses Open
We report on a direct time-domain measurement of the temporal properties of a seeded free-electron laser pulse in the extreme ultraviolet spectral range. Utilizing the oscillating electromagnetic field of terahertz radiation, a single-shot…
View article: Simulations of Nonlinear Propagation of Light Pulses
Simulations of Nonlinear Propagation of Light Pulses Open
This thesis investigates the simulation of nonlinear effects and the propagation of optical diffractive light pulses. On this account, two simulation programs were considered.Firstly, distributed by the company Oxalis, the program Commod P…
View article: Weak-field few-femtosecond VUV photodissociation dynamics of water isotopologues
Weak-field few-femtosecond VUV photodissociation dynamics of water isotopologues Open
We present a joint experimental and theoretical study of the VUV-induced dynamics of H2O and its deuterated isotopologues in the first excited state (A1B1) utilizing a VUV-pump VUV-probe scheme combined with ab initio classical trajectory …
View article: Single-shot nonlinear spectroscopy in the vacuum-ultraviolet
Single-shot nonlinear spectroscopy in the vacuum-ultraviolet Open
Time-resolved spectroscopy in the vacuum/extreme ultraviolet (VUV/XUV) spectral range promises to disclose ultrafast dynamics in all states of matter. Completing a measurement within a single shot eliminates the influence of experimental p…
View article: Femtosecond dynamics of correlated many-body states in C<sub>60</sub> fullerenes
Femtosecond dynamics of correlated many-body states in C<sub>60</sub> fullerenes Open
In this joint theoretical and experimental work we investigate the population and decay dynamics of excited states of the C60 molecule by time-resolved two-photon photoemission. We map out how the thermally excited vibrational degrees of f…
View article: Correlated electronic decay in expanding clusters triggered by intense XUV pulses from a Free-Electron-Laser
Correlated electronic decay in expanding clusters triggered by intense XUV pulses from a Free-Electron-Laser Open
Irradiation of nanoscale clusters and large molecules with intense laser pulses transforms them into highly-excited non- equilibrium states. The dynamics of intense laser-cluster interaction is encoded in electron kinetic energy spectra, w…
View article: Concept for a Seeded FEL at FLASH2
Concept for a Seeded FEL at FLASH2 Open
The free-electron laser (FEL) FLASH is a user facility delivering photon pulses down to 4 nm wavelength. Recently, the second FEL undulator beamline 'FLASH2' was added to the facility. Operating in self-amplified spontaneous emission (SASE…
View article: Experience in Operating sFLASH With High-Gain Harmonic Generation
Experience in Operating sFLASH With High-Gain Harmonic Generation Open
sFLASH, the experimental setup for external seeding of free-electron lasers (FEL) at FLASH, has been operated in the high-gain harmonic generation (HGHG) mode. A detailed characterization of the laser-induced energy modulation, as well as …
View article: A single-shot nonlinear autocorrelation approach for time-resolved physics in the vacuum ultraviolet spectral range
A single-shot nonlinear autocorrelation approach for time-resolved physics in the vacuum ultraviolet spectral range Open
In this work, a single-shot temporal metrology scheme operating in the vacuum-extreme ultraviolet spectral range has been designed and experimentally implemented. Utilizing an anti-collinear geometry, a second-order intensity autocorrelati…
View article: Tracing few-femtosecond photodissociation dynamics on molecular oxygen with a single-color pump-probe scheme in the VUV
Tracing few-femtosecond photodissociation dynamics on molecular oxygen with a single-color pump-probe scheme in the VUV Open
Molecular wave-packet dynamics in oxygen are studied in the time domain, using a single-color VUV-pump--VUV-probe scheme. 17-fs VUV pulses, centered at 161 nm are generated via high-order harmonic generation driven by an intense 800-nm pul…
View article: A full-field transmission x-ray microscope for time-resolved imaging of magnetic nanostructures
A full-field transmission x-ray microscope for time-resolved imaging of magnetic nanostructures Open
Sub-nanosecond magnetization dynamics of small permalloy (Ni80Fe20) elements has been investigated with a new full-field transmission microscope at the soft X-ray beamline P04 of the high brilliance synchrotron radiation source PETRA III. …
View article: Molecular dynamics observed with nonlinear autocorrelation in the VUV range
Molecular dynamics observed with nonlinear autocorrelation in the VUV range Open
160 nm vacuum-ultraviolet pulses generated as the 5th harmonic of an 800 nm femtosecond laser are sufficiently energetic to drive multiphoton transitions in molecules. 2nd order intensity- as well as interferometric autocorrelation were us…