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Wyszukujesz frazę "42.65.Tg" wg kryterium: Temat

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    Wyświetlanie 1-10 z 10
    Tytuł:
    "Necklace-Ring" Beams in Saturable Kerr Media with Square-Root Nonlinearity
    Autorzy:
    Petrović, M. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047852.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.Tg
    42.65.Sf
    Opis:
    Analytical and numerical investigation of the propagation of "necklace-ring" optical beams in Kerr-like saturable photorefractive media with square-root nonlinearity is carried out. Analytic expression for the propagation dynamics of the necklace beams is in good agreement with numerical findings.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 921-925
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Propagation effects in superfluorescence
    Autorzy:
    Michalska-Trautman, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1075590.pdf
    Data publikacji:
    2016-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.Sf
    42.65.Tg
    Opis:
    The evolution of a superfluorescent pulse is studied in the region of large sample lengths. A solution to the Maxwell-Bloch semiclassical equations is found by using the inverse scattering method. It has the form of a one-soliton solution with varying parameters. Dependence on the pulse width and the retarded time is found without further approximations. These parameters are shown to be independent of the inhomogeneous broadening time. Their values are in good agreement with experiment. Asymmetry of the pulse is also investigated.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 3; 734-736
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dancing Light: Counterpropagating Beams in Photorefractive Crystals
    Autorzy:
    Belić, M.
    Petrović, M.
    Jović, D.
    Strinić, A.
    Arsenović, D.
    Prvanović, S.
    Jovanović, R.
    Petrović, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1814046.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.Tg
    42.65.Sf
    Opis:
    A review of work on the dynamical behavior of counterpropagating incoherent laser beams in photorefractive crystals is presented. Numerical study of counterpropagating beams of different type is carried out, in both space and time, using an appropriate theoretical model. The development of patterns in broad hyper-Gaussian counterpropagating beams in saturable Kerr-like media is investigated, by varying the width of beams. Rotational properties of counterpropagating mutually incoherent self-trapped vortex beams in optically induced fixed photonic lattices are also investigated numerically. One of the fundamental quantum mechanical phenomena is observed for the counterpropagating beams in photonic lattices, the tunneling of light from the first to the higher-order bands of the lattice band gap spectrum. The transfer of angular momentum from vortex beams to optically induced photonic lattices is also demonstrated. For the interacting beams it is found that the sum of angular momenta of counterpropagating components is not a conserved quantity, but the difference is. In the fixed lattices there is always a considerable loss of angular momentum.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 729-736
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dissipative Optical Solitons
    Autorzy:
    Skarka, V.
    Aleksic, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1814360.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.Sf
    42.65.Tg
    Opis:
    The generation and nonlinear dynamics of multi-dimensional optical dissipative solitonic pulses are examined. The variational method is extended to complex dissipative systems, in order to obtain steady state solutions of the one-, two-, and three-dimensional complex cubic-quintic Ginzburg-Landau equation. A stability criterion is established fixing a domain of dissipative parameters for stable steady state solutions. Following numerical simulations, evolution of even asymmetric input pulse from this domain leads to stable dissipative solitons and light bullets.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 791-798
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spinning Optical Spatiotemporal Solitons in Quadratic Media
    Autorzy:
    Mihalache, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2015065.pdf
    Data publikacji:
    2001-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.Tg
    42.65.Sf
    Opis:
    The unique features of the families of bright spinning spatiotemporal solitons (doughnuts or vortex light bullets) in dispersive quadratic media, including their stability, are presented. Both analytical results, obtained by means of a simple variational approximation, and numerical simulations are presented and compared. It was found that though the variational approximation is not very accurate, it correctly describes the qualitative features of the spinning spatiotemporal solitons. The spinning light bullets are subject to a strong azimuthal instability, which leads to the break-up of the spinning soliton into a set of fragments, each being a stable nonspinning spatiotemporal soliton.
    Źródło:
    Acta Physica Polonica A; 2001, 99, 1; 47-56
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Finding Solitons in Bifurcations of Stationary Solutions of Complex Ginzburg-Landau Equation
    Autorzy:
    Timotijevic, D. V.
    Derbazi, M.
    Skarka, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047837.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.Sf
    42.65.Tg
    Opis:
    Nonlinear dissipative systems, particularly optical dissipative solitons are well described by complex Ginzburg-Landau equation. Solutions of two- and three-dimensional complex cubic-quintic Ginzburg-Landau equation assuming exponential dependence on propagation parameter are studied. Approximate analytical stationary solutions of cubic-quintic Ginzburg-Landau equation are found by solving systems of ordinary differential equations. We are solving two-point boundary problems using adapted shooting method. Stable and unstable branches of the bifurcation diagram are identified using linear stability analysis. In this way we established conditions for generation and propagation of stable dissipative solitons in two and three dimensions. These results are in agreement with numerical simulation of cubic-quintic Ginzburg-Landau equation and the recently established approach based on variational method generalized to dissipative systems and therein established stability criterion.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 853-858
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gaussian-Induced Rotation in Triangular Photonic Lattices
    Autorzy:
    Jović, D.
    Prvanović, S.
    Jovanović, R.
    Petrović, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047884.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.Tg
    42.65.Sf
    Opis:
    Time-dependent rotation of counterpropagating mutually incoherent self-trapped Gaussian beams in periodic optically induced fixed photonic lattices is numerically investigated. Rotation occurs for some values of control parameters. For parameters of such rotation, the solitonic solutions are found using modified Petviashvili's method. It is shown that they correspond to the lowest values of propagation constant in the power diagrams and relation between observed rotation and less confined discrete solitonic solutions are demonstrated.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 1067-1072
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Propagation of Spatial Solitons with Nonlinear Kerr Effect in Thermal Medium
    Autorzy:
    Gharaati, A.
    Elahi, P.
    Cari, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047846.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.Sf
    42.65.Tg
    42.65.Wi
    Opis:
    In this paper, the propagation and behavior of spatial solitons of inhomogeneous nonlinear Schrödinger equation in thermal medium will be investigated analytically. The theoretical model is established by considering the change of refractive index of medium due to heat deposition of entrance beam. The soliton like solution in such thermal medium was derived. The effect of input pump power and beam radius on the behavior of solitons will be studied finally.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 891-896
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Beam Propagation in Nematic Liquid Crystals
    Autorzy:
    Strinic, A. I.
    Belic, M. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047844.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.Tg
    42.65.Sf
    42.70.Df
    Opis:
    We investigate the behavior of beams propagating in nematic liquid crystals. A spatiotemporal model for the beam propagation and the director reorientation in a nematic liquid crystal is treated numerically in three spatial dimensions and time. We demonstrate the formation of stable solitons in a narrow threshold region of beam intensities for a set of fixed parameters and display soliton breathing. Below the threshold region the beams diffract, above the region spatiotemporal instabilities are observed, as the input intensity and the optical and static permittivity anisotropies of the liquid crystal molecules are increased. We demonstrate the filamentation of solitons above the threshold with increasing input intensity.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 877-883
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Counterpropagating Dipole Beams in Nematic Liquid Crystals
    Autorzy:
    Strinic, A. I.
    Jovic, D. M.
    Belic, M. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047845.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.Tg
    42.65.Sf
    42.70.Df
    Opis:
    We investigate the behavior of counterpropagating optical beam structures in nematic liquid crystals. We restrict our attention to the dipole-dipole beam arrangements. A time-dependent model for the beam propagation and the director reorientation in nematic liquid crystals is numerically treated in three spatial dimensions and time. Stable dipole beams are observed in a very narrow threshold region of control parameters. Below this region the beams diffract, above the region spatiotemporal instabilities are observed, as the input intensity is increased and also as the distance between the dipole partners is decreased. A transverse beam displacement of counterpropagating dipole beams is also found. The difference between the in-phase and out-of-phase components of the dipole is significant, but only for a smaller distance between the dipole partners.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 885-890
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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