104 citations · 424 across the 21 of their papers we have counts for
21 papers
Enhancing the purity of single photons in parametric down-conversion through simultaneous pump-beam and crystal-domain engineering
Baghdasar Baghdasaryan, Fabian Steinlechner, Stephan Fritzsche
Spontaneous parametric down-conversion (SPDC) has shown great promise in the generation of pure and indistinguishable single photons. Photon pairs produced in bulk crystals are hig…
Electron correlation effects on the factor of lithiumlike ions
D. V. Zinenko, D. A. Glazov, V. P. Kosheleva +2
We present the systematic QED treatment of the electron correlation effects on the factor of lithiumlike ions for the wide range of nuclear charge number -- . The o…
Nondipole strong-field approximation for above threshold ionization in few-cycle pulse
Danish Furekh Dar, Björn Minneker, Stephan Fritzsche
The ionization of atoms and molecules by strong laser fields has been studied extensively, both theoretically and experimentally. The strong-field approximation (SFA) allows for th…
Transport of intense ion beams in plasmas: collimation and energy-loss reduction
Yongtao Zhao, Benzheng Chen, Dong Wu +15
We compare the transport properties of a well-characterized hydrogen plasma for low and high current ion beams. The energy-loss of low current beams can be well understood, within…
Maximizing the Validity of the Gaussian Approximation for the biphoton State from Parametric Downconversion
Baghdasar Baghdasaryan, Fabian Steinlechner, Stephan Fritzsche
Spontaneous parametric down-conversion (SPDC) is widely used in quantum applications based on photonic entanglement. The efficiency of photon pair generation is often characterized…
Spectral Properties of Transverse Laguerre-Gauss Modes in Parametric Down-Conversion
Carlos Sevilla-Gutiérrez, Varun Raj Kaipalath, Baghdasar Baghdasaryan +3
The first color photos of the parametric down-conversion (PDC) emission cone illustrate the correlation of longitudinal- and transverse momentum in the process, i.e., wavelength-de…
Generalized description of the spatio-temporal biphoton State in spontaneous parametric down-conversion
Baghdasar Baghdasaryan, Carlos Sevilla-Gutiérrez, Fabian Steinlechner +1
Spontaneous parametric down-conversion (SPDC) is a widely used source for photonic entanglement. Years of focused research have led to a solid understanding of the process, but a c…
Multiple Photodetachment of Oxygen Anions via K-Shell Excitation and Ionization: Direct Double-Detachment Processes and Subsequent Deexcitation Cascades
S. Schippers, A. Hamann, A. Perry-Sassmannshausen +6
Experimental cross sections for m-fold photodetachment (m=2-5) of oxygen anions via K-shell excitation and ionization were measured in the photon-energy range of 525-1500 eV using…
QED approach to valence-hole excitation in closed shell systems
R. N. Soguel, A. V. Volotka, S. Fritzsche
An ab initio QED approach to treat a valence-hole excitation in closed shell systems is developed in the framework of the two-time-Green function method. The derivation considers a…
Polarization effects in the total rate of biharmonic ionization of atoms
J. Hofbrucker, S. Ramakrishna, A. V. Volotka +1
The total ionization rate of biharmonic () ionization is studied within the independent particle approximation and the third order perturbation theory. Particular attention…
g Factor of Lithiumlike Silicon and Calcium: Resolving the Disagreement between Theory and Experiment
V. P. Kosheleva, A. V. Volotka, D. A. Glazov +2
The bound-electron g factor is a stringent tool for tests of the Standard Model and the search for new physics. The comparison between an experiment on the g factor of lithiumlike…
Photoexcitation of atoms by cylindrically polarized Laguerre-Gaussian beams
S. Ramakrishna, J. Hofbrucker, S. Fritzsche
We analyze the photo-excitation of atoms with a single valence electron by cylindrically polarized Laguerre-Gaussian beams. Theoretical analysis is performed within the framework o…
Breakdown of the electric dipole approximation at Cooper minima in direct two-photon ionisation
J. Hofbrucker, A. V. Volotka, S. Fritzsche
We predict breakdown of the electric dipole approximation at nonlinear Cooper minimum in direct two-photon shell atomic ionisation by circularly polarised light. According to p…
Plasma-environment effects on K lines of astrophysical interest III. IPs, K thresholds, radiative rates, and Auger widths in Fe ix - Fe xvi
J. Deprince, M. A. Bautista, S. Fritzsche +5
Aims. In the context of black-hole accretion disks, we aim to compute the plasma-environment effects on the atomic parameters used to model the decay of K-vacancy states in moderat…
Two-color above threshold ionization of atoms and ions in XUV Bessel beams and combined with intense laser light
D. Seipt, R. A. Müller, A. Surzhykov +1
The two-color above-threshold ionization (ATI) of atoms and ions is investigated for a vortex Bessel beam in the presence of a strong near-infrared (NIR) light field. While the pho…
Elastic scattering of vortex electrons provides direct access to the Coulomb phase
I. P. Ivanov, D. Seipt, A. Surzhykov +1
Vortex electron beams are freely propagating electron waves carrying adjustable orbital angular momentum with respect to the propagation direction. Such beams were experimentally r…
Double-slit experiment in momentum space
I. P. Ivanov, D. Seipt, A. Surzhykov +1
Young's classic double-slit experiment demonstrates the reality of interference when waves and particles travel simultaneously along two different spatial paths. Here, we propose a…
Scattering of twisted relativistic electrons by atoms
V. Serbo, I. P. Ivanov, S. Fritzsche +2
The Mott scattering of high-energetic twisted electrons by atoms is investigated within the framework of the first Born approximation and Dirac's relativistic equation. Special emp…
Compton scattering of twisted light: angular distribution and polarization of scattered photons
S. Stock, A. Surzhykov, S. Fritzsche +1
Compton scattering of twisted photons is investigated within a non-relativistic framework using first-order perturbation theory. We formulate the problem in the density matrix theo…
Narrowband inverse Compton scattering x-ray sources at high laser intensities
D. Seipt, S. G. Rykovanov, A. Surzhykov +1
Narrowband x- and gamma-ray sources based on the inverse Compton scattering of laser pulses suffer from a limitation of the allowed laser intensity due to the onset of nonlinear ef…
Atomic ionization by twisted photons: Angular distribution of emitted electrons
Oliver Matula, Armen G Hayrapetyan, Valeriy G Serbo +2
We investigate the angular distribution of electrons that are emitted in the ionization of hydrogen-like ions by twisted photons. Analysis is performed based on the first-order per…