M. Wollenhaupt
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View article: Adiabatic dynamics in a V-type quantum system by oppositely chirped counterrotating circularly polarized laser pulses
Adiabatic dynamics in a V-type quantum system by oppositely chirped counterrotating circularly polarized laser pulses Open
Shaped free electron vortices (SEVs) have recently been studied using atomic (1+2) resonance-enhanced multiphoton ionization (REMPI) by oppositely chirped counterrotating circularly polarized (OC-CRCP) femtosecond laser pulses. By transiti…
View article: Adiabatic dynamics in a V-type quantum system by oppositely chirped counterrotating circularly polarized laser pulses
Adiabatic dynamics in a V-type quantum system by oppositely chirped counterrotating circularly polarized laser pulses Open
Shaped free electron vortices (SEVs) have recently been studied using atomic (1+2) resonance-enhanced multiphoton ionization (REMPI) by oppositely chirped counterrotating circularly polarized (OC-CRCP) femtosecond laser pulses. By transiti…
View article: Strong-field quantum control in the extreme ultraviolet domain using pulse shaping
Strong-field quantum control in the extreme ultraviolet domain using pulse shaping Open
Tailored light–matter interactions in the strong coupling regime enable the manipulation and control of quantum systems with up to unit efficiency 1,2 , with applications ranging from quantum information to photochemistry 3–7 . Although st…
View article: Measurement of ionization delays in atomic REMPI using photoelectron vortices
Measurement of ionization delays in atomic REMPI using photoelectron vortices Open
We study time-delays in atomic multiphoton ionization (MPI) using the phase-sensitive detection of photoelectron vortices. Photoelectron vortices are created by MPI with counter-rotating circularly polarized (CRCP) ultrashort double pulse …
View article: Shaped free electron vortices
Shaped free electron vortices Open
Since their first theoretical proposal [Ngoko Djiokap et al., Phys. Rev. Lett. 115, 113004 (2015)] and experimental demonstration [Pengel et al., Phys. Rev. Lett. 118, 053003 (2017)], free electron vortices (FEVs) have attracted considerab…
View article: Ultrafast artificial intelligence: machine learning with atomic-scale quantum systems
Ultrafast artificial intelligence: machine learning with atomic-scale quantum systems Open
We train a model atom to recognize pixel-drawn digits based on hand-written numbers in the range 0–9, employing intense light–matter interaction as a computational resource. For training, the images of the digits are converted into shaped …
View article: Strong-field quantum control in the extreme ultraviolet using pulse shaping
Strong-field quantum control in the extreme ultraviolet using pulse shaping Open
Tailored light-matter interactions in the strong coupling regime enable the manipulation and control of quantum systems with up to unit efficiency, with applications ranging from quantum information to photochemistry. While strong light-ma…
View article: Multichromatic supercontinuum polarization shaping applied to photoelectron holography
Multichromatic supercontinuum polarization shaping applied to photoelectron holography Open
We present a supercontinuum pulse shaping method specifically designed for the generation of polarization-tailored multichromatic femtosecond laser fields. By combining a 4 f -polarization pulse shaper with a custom-made polarizer kit, we …
View article: Bichromatic phase-control of interfering Autler-Townes spectra
Bichromatic phase-control of interfering Autler-Townes spectra Open
We propose a new scheme to control the shape of the Autler-Townes (AT) doublet in the photoelectron spectrum from atomic resonance-enhanced multiphoton ionization (REMPI). The scheme is based on the interference of two AT doublets created …
View article: Ultrafast artificial intelligence: Machine learning with atomic-scale quantum systems
Ultrafast artificial intelligence: Machine learning with atomic-scale quantum systems Open
We train a model atom to recognize hand-written digits between 0 and 9, employing intense light--matter interaction as a computational resource. For training, individual images of hand-written digits in the range 0-9 are converted into sha…
View article: Attosecond ionization dynamics of modulated, few-cycle XUV pulses
Attosecond ionization dynamics of modulated, few-cycle XUV pulses Open
Few-cycle, attosecond extreme ultraviolet (XUV) pulses in the strong field regime are becoming experimentally feasible, prompting theoretical investigating of the ionization dynamics induced by such pulses. Here, we provide a systematic st…
View article: Three-dimensional photoelectron holography with trichromatic polarization-tailored laser pulses
Three-dimensional photoelectron holography with trichromatic polarization-tailored laser pulses Open
We present a three-dimensional (3D) photoelectron wave packet holography scheme based on polarization-tailored trichromatic femtosecond laser pulses for the determination of quantum phases in atomic multiphoton ionization (MPI). Experiment…
View article: Molecular Free Electron Vortices in Photoionization by Polarization-Tailored Ultrashort Laser Pulses
Molecular Free Electron Vortices in Photoionization by Polarization-Tailored Ultrashort Laser Pulses Open
Atomic and molecular free electron vortices (FEVs), characterized by their spiral-shaped momentum distribution, have recently attracted a great deal of attention due to their varied shapes and their unusual topological properties. Shortly …
View article: Determination of atomic multiphoton-ionization phases by trichromatic multichannel wave-packet interferometry
Determination of atomic multiphoton-ionization phases by trichromatic multichannel wave-packet interferometry Open
We present a multichannel photoelectron interferometry technique based on\ntrichromatic pulse shaping for unambiguous determination of quantum phases in\nmultiphoton ionization (MPI) of potassium atoms. The colors of the laser field\nare c…
View article: Multichromatic Polarization-Controlled Pulse Sequences for Coherent Control of Multiphoton Ionization
Multichromatic Polarization-Controlled Pulse Sequences for Coherent Control of Multiphoton Ionization Open
In this review, we report on recent progress in the generation and application of multichromatic polarization-tailored pulse sequences for the coherent control of multiphoton ionization (MPI) dynamics and present unpublished experimental r…
View article: Coherent control mechanisms in bichromatic multiphoton ionization
Coherent control mechanisms in bichromatic multiphoton ionization Open
Free electron vortices (FEVs) generated by multiphoton ionization (MPI) with ultrashort laser pulses have attracted significant attention due to their varied symmetries and unusual topological properties. We study two physical mechanisms o…
View article: Tailored holograms for superimposed vortex states
Tailored holograms for superimposed vortex states Open
We present the generation, optimization and full control of superimposed optical vortices (SOVs) using tailored computer generated holograms by utilizing a 2D liquid crystal spatial light modulator. To perform full radial and azimuthal con…
View article: Mixed orbital angular momentum states in transmission electron microscopy and bichromatic multiphoton ionization
Mixed orbital angular momentum states in transmission electron microscopy and bichromatic multiphoton ionization Open
The coherent control of electron beams and ultrafast electron wave packets dynamics have attracted significant attention in electron microscopy as well as in atomic physics. In order to unify the conceptual pictures developed in both field…
View article: Atomic photoionization dynamics in ultrashort cycloidal laser fields
Atomic photoionization dynamics in ultrashort cycloidal laser fields Open
We present numerical simulations of ultrafast multiphoton ionization dynamics\nin a two-dimensional atomic model driven by co- and counterrotating circularly\npolarized single-color and bichromatic carrier envelope phase (CEP) stable\nultr…
View article: Reaction Microscope experiments with shaped laser pulses
Reaction Microscope experiments with shaped laser pulses Open
Synopsis Using a 4f pulse shaper in combination with a Reaction Microscope we performed 800 nm pump-probe experiments with orthogonally polarized pulses on H₂.
View article: Time-resolved 3D imaging of ultrafast spin–orbit wave packet dynamics
Time-resolved 3D imaging of ultrafast spin–orbit wave packet dynamics Open
We combine bichromatic polarization pulse shaping with photoelectron imaging tomography for time-resolved spatial imaging of ultrafast spin–orbit wave packet (SOWP) dynamics in atoms. Polarization-shaped two-color pump-probe sequences are …
View article: Control of free electron wave packets by polarization-tailored ultrashort bichromatic laser fields
Control of free electron wave packets by polarization-tailored ultrashort bichromatic laser fields Open
We review recent advances in the generation of polarization-tailored ultrashort bichromatic laser fields and their application to the coherent control of ultrafast photoionization dynamics. In the experiments, we use polarization-shaped bi…
View article: CEP control of multiphoton ionization using shaper-generated variable frequency ratio bichromatic fields
CEP control of multiphoton ionization using shaper-generated variable frequency ratio bichromatic fields Open
We demonstrate CEP control of the directional photoemission from multiphoton ionization (MPI) of xenon atoms using (7 ω :8 ω ) bichromatic fields whose frequency ratio is tailored to the order of the MPI process. The bichromatic fields are…
View article: Control of photoelectron momentum distributions by bichromatic polarization-shaped laser fields
Control of photoelectron momentum distributions by bichromatic polarization-shaped laser fields Open
Bichromatic polarization-shaped femtosecond laser pulses are used to control three-dimensional photoelectron momentum distributions (3D-EDs) from resonance enhanced multi-photon ionization of potassium atoms. The light fields consisting of…
View article: Ultrashort polarization-tailored bichromatic fields from a CEP-stable white light supercontinuum
Ultrashort polarization-tailored bichromatic fields from a CEP-stable white light supercontinuum Open
We apply ultrafast polarization shaping to an ultrabroadband carrier envelope phase (CEP) stable white light supercontinuum to generate polarization-tailored bichromatic laser fields of low-order frequency ratio. The generation of orthogon…
View article: Photoelectron circular dichroism in different ionization regimes
Photoelectron circular dichroism in different ionization regimes Open
Photoelectron circular dichroism (PECD) describes an asymmetry in the photoelectron angular distribution (PAD) from photoionization of randomly oriented enantiomers with circularly polarized light. Beaulieu et al present a comprehensive se…