A. Raczyński - Academia.edu (original) (raw)

Papers by A. Raczyński

Photon Counting Applications, Quantum Optics, and Quantum Information Transfer and Processing III, 2011

ABSTRACT A strong control field coupling two empty states of a lambda system makes the medium tra... more ABSTRACT A strong control field coupling two empty states of a lambda system makes the medium transparent for a probe pulse. This phenomenon known as electromagnetically induced transparency is here modified by switching a weak microwave field coupling two lower states of the system. As a response to the control and microwave fields, the medium itself acts as a source of an electromagnetic wave which interferes with the incoming pulse. The properties of the net pulse leaving the sample, in particular its magnitude and multipeak shape, will be analyzed in detail, depending on the model parameters.

Physica Scripta, 1997

Different definitions of the photoionization spectra corresponding to various realizations of the... more Different definitions of the photoionization spectra corresponding to various realizations of the experiment are discussed using the language of quantum collision theory. Formal expressions for the transition amplitudes are compared, with stress put on the shift of the spectra. The general results are illustrated on a demonstrative nonperturbative model.

Journal of the Optical Society of America B, 2013

Molecular Physics, 1986

ABSTRACT Three moments of the collision induced absorption spectral density are computed with two... more ABSTRACT Three moments of the collision induced absorption spectral density are computed with two- and three-body effects taken into account. A model free of adjustable parameters is applied to reproduce the density-dependent spectrum.

Molecular Physics, 1988

An evaluation is attempted of the influence of quantum effects on collision-induced absorption sp... more An evaluation is attempted of the influence of quantum effects on collision-induced absorption spectrum of He + Xe. The quantum-corrected moments are used in lowest orders of the quantum-mechanical Mori formulae with a gaussian closure. The corrected spectral functions differ considerably from their classical counterparts and exhibit a flat maximum. The applicability of this approach is limited by its sensitiveness to quantum corrections to higher moments.

$Research paper thumbnail of The method of continued fractions for multichannel scattering$

Chemical Physics Letters, 1985

The method of continued fractions of Hor&k and Sasakawa is adapted to calculate transition probab... more The method of continued fractions of Hor&k and Sasakawa is adapted to calculate transition probabilities in multichannel scattering. Numerical tests are performed for an exactly soluble two-channel model and accurate results are obtained after a small number of iterations even for strong coupling potentials. A modified version of the method is also presented and tested

Chemical Physics, 1984

Abstract Accurate quantum-mechanical and classical results are obtained for the collision-induced... more Abstract Accurate quantum-mechanical and classical results are obtained for the collision-induced absorption coefficient in the binary-collision approximation. The contribution of quantum effects does not exceed a few percent. For a given HFD interaction potential the parameters of the induced dipole moment are chosen to obtain a good agreement with experiment.

Photodetachment in an ultrastrong laser field in two spatial dimensions is investigated ab initio... more Photodetachment in an ultrastrong laser field in two spatial dimensions is investigated ab initio. A qualitative behavior of the packet for a short-range binding potential is contrasted with that for a soft-core potential, in particular dynamical effects due to a rescattering of fragments separated from the main packet are demonstrated.

Physical Review A, 2018

We report the measurement of the photoionization cross sections of the 5S 1/2 and 5P 3/2 states o... more We report the measurement of the photoionization cross sections of the 5S 1/2 and 5P 3/2 states of 87 Rb in a two-species Hg and Rb magneto-optical trap (MOT) by the cooling laser for Hg. The photoionization cross sections of Rb in the 5S 1/2 and 5P 3/2 states at 253.7 nm are determined to be 1 +4.3 −1 × 10 −20 cm 2 and 4.63(30) × 10 −18 cm 2 , respectively. To measure the 5S 1/2 and 5P 3/2 states fractions in the MOT we detected photoionization rate of the 5P 3/2 state by an additional 401.5 nm laser. The photoionization cross section of Rb in the 5P 3/2 state at 401.5 nm is determined to be 1.18(10) × 10 −17 cm 2 .

Physical Review A, 2017

The propagation, storage, and release of two quantized light fields in an optically dressed atomi... more The propagation, storage, and release of two quantized light fields in an optically dressed atomic medium in the tripod configuration are studied. Using the formalism of spinor dark-state polaritons, the probabilities are obtained of finding outgoing photons of two possible localizations and two possible types, i.e., having different frequencies or polarizations. An additional interaction at the storage stage is applied which modifies the atomic coherences due to the stored photons; this results in a modification of the states of the outgoing photons. The conditions are examined for the photons' spatial and type coalescence typical of the Hong-Ou-Mandel effect, i.e., a zero probability of finding the outgoing photons having not only different localizations but also types. These results can possibly be observed in rubidium vapors.

Journal of the Optical Society of America B, 2014

Simultaneous propagation of two probe pulses in a medium of four-level atoms irradiated by three ... more Simultaneous propagation of two probe pulses in a medium of four-level atoms irradiated by three control fields is studied. The double Λ configuration has been closed by a fifth field, coupling the lower levels. It is shown that the propagation can be described in terms of four modes characterized by particular effective susceptibilities, which have absorption or gain peaks and transparency windows. For incoming one-peak pulses, multipeak spectra are built during the propagation including a few components of well-defined frequencies. They evolve along the sample with some of their spectral components being transmitted, absorbed, or amplified.

Open Systems, Entanglement and Quantum Optics, 2013

Journal of the Optical Society of America B, 2015

Pulse propagation is studied in an EIT medium with the control field having a periodically varyin... more Pulse propagation is studied in an EIT medium with the control field having a periodically varying phase (chirp). Based both on numerical calculations and on an approximate approach neglecting absorption and nonadiabatic effects, it is shown that transparency occurs for probe pulses having a sufficiently narrow envelope and an appropriately suited chirp. For other chirped pulses the evolution of their spectra along a sample is studied. Using a projection method one can divide a pulse into a part for which the medium is transparent and a rest for which it is opaque.

Physics Letters A, 1997

The dynamics of the bound state population and the photoelectron energy spectra due to photoioniz... more The dynamics of the bound state population and the photoelectron energy spectra due to photoionization by a double pulse are calculated for a model atomic system. The splitting of the ATI peaks due to the structure of the pulse is presented and discussed. @ 1997 Published by Elsevier Science B.V.

Physical Review A, 2001

ABSTRACT Photoionization in the regime of the barrier suppression is investigated within a three-... more ABSTRACT Photoionization in the regime of the barrier suppression is investigated within a three-dimensional, fully quantum-mechanical, time-dependent model. It is shown how a structure is formed in the envelope of the above threshold ionization spectra, for energies smaller than the ponderomotive potential. A correspondence between this structure and the shape of the initial-state decay curve, as well as the radial distribution of the electron wave packet, is proven.