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    Tytuł:
    Examination of Temperature Influence on Wide-Angle Paratellurite Crystal Acousto-Optic Filters Operation
    Autorzy:
    Mantsevich, S.
    Korablev, O.
    Kalinnikov, Yu.
    Ivanov, A.
    Kiselev, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1383183.pdf
    Data publikacji:
    2015-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.25.Fx
    Opis:
    The effect of temperature on a wide-angle paratellurite acousto-optic tunable filter is analyzed on the example of two different acousto-optic tunable filter configurations. The acousto-optic tunable filter operation was between -50°C to +40°C; also the survival of an acousto-optic tunable filter device at -130°C was demonstrated. The phase matching ultrasound frequency varies with temperature. We link this temperature shift to photoelastic characteristics of the $TeO_2$. A generalization is made for all wide-angle acousto-optic tunable filters based on $TeO_2$ crystal. In addition, the temperature influence on the acoustic walk off angle was examined.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 1; 43-45
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Two-Dimensional Bragg-Ewalds Dynamical Diffraction and Spontaneous Gratings: Qualitative Nonlinear Optics Treatment
    Autorzy:
    Lymar, V. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035709.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.25.Fx
    Opis:
    A stimulated light scattering in thin waveguide film, filled by point Kerr-type dipoles, under inclined pumping beam incidence is examined. The iterative procedure of successive approximations is applied to define qualitatively the space spectrum of waveguide mode scattered field at the condition of its self-consistency with dipole oscillations. A comparison with experimental data is discussed briefly.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 2-3; 275-281
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diffraction of Laguerre-Gaussian Beam by a Helical Axicon
    Autorzy:
    Topuzoski, S.
    Janicijevic, Lj.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791237.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.25.Fx
    42.60.Jf
    Opis:
    In this article the transformation of the Laguerre-Gaussian beam with radial mode number n and azimuthal mode number l, into a vortex, diverging or nondiverging Bessel beam with increased, decreased or zeroth phase singularity order has been investigated theoretically. We deduce and study analytical expressions for the amplitude and intensity distribution of the diffracted wave field in the process of Fresnel diffraction, using the stationary phase method, and also, for the vortex radius and the propagation distance of the output field.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 557-559
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diffraction by a Half-Plane in a Chiral Medium (Normal Incidence)
    Autorzy:
    Przeździecki, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929338.pdf
    Data publikacji:
    1993-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    41.20.-q
    42.25.Fx
    Opis:
    An exact, closed form solution is presented for a diffraction problem by a half-plane embedded in a chiral medium. The incidence direction of an electromagnetic plane wave is assumed to be normal to the edge of the half-plane. The problem has been reduced to a boundary value problem for two modal potentials satisfying distinct Helmholtz equations and coupled by the boundary conditions at the half-plane. A solution is constructed with the aid of the Wiener-Hopf technique. A basic feature of the problem is its two-mode character exhibited by: two families of diffracted rays, reflection coupling of the modes, excitation of lateral waves.
    Źródło:
    Acta Physica Polonica A; 1993, 83, 6; 739-750
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exact Phase and its Eikonal Approximation for Class of Reflectionless Index Profiles
    Autorzy:
    Sharma, S. K.
    Ghosh, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1963260.pdf
    Data publikacji:
    1997-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.25.Fx
    41.20.Jb
    Opis:
    We examine the problem of transmission of electromagnetic waves in a multiparameter reflectionless dielectric. It is shown that it is possible to obtain an analytic form for the phase of the exact transmission amplitude. In the high frequency limit the exact result is found to lead to the eikonal approximation. Interestingly, the high frequency limit and long-range approximation required for the validity of the eikonal approximation are not independent here.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 3; 555-561
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Methods of Determining the Beat Length of Planar Waveguides
    Autorzy:
    Gut, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399348.pdf
    Data publikacji:
    2013-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.25.Ja
    42.25.Lc
    42.25.Fx
    Opis:
    The paper presents two methods of determining the planar waveguide birefringence and the measuring stands, which are used to determine the beat length of planar waveguide structures. The light is introduced into the waveguide through a prism coupler. The first method applies measurements of scattered light. The second method uses an immersion coupler. The most fundamental property of an immersion coupler is the possibility to change fluently the propagation length while immersing the waveguide.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 3; 425-427
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Regular Trends of Acousto-Optic Interaction in Terahertz Region of Electromagnetic Radiation
    Autorzy:
    Nikitin, P.
    Voloshinov, V.
    Gerasimov, V.
    Knyazev, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1383228.pdf
    Data publikacji:
    2015-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.20.hb
    42.25.Fx
    Opis:
    Basic problems of acousto-optic interaction in terahertz region of electromagnetic spectrum are considered. We obtained experimental results that are fitted by generalized theoretical model developed with the goals to describe the interaction in detail. Our analysis showed that crystalline germanium is one of the best materials to observe the acousto-optic interaction in the terahertz range. The carried out study proved that a germanium based acousto-optic device could be used for fast and reliable deflection of monochromatic radiation in the terahertz spectral region.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 1; 49-51
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Application of Scattered Light in the Metrology of Planar Waveguides
    Autorzy:
    Gut, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1417959.pdf
    Data publikacji:
    2012-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.25.Ja
    42.25.Lc
    42.25.Fx
    Opis:
    The paper presents a measuring stand which permits to determine the attenuation and modal birefringence of planar waveguide structures. The light is introduced into the waveguide through a prismatic coupler. This permits to determine attenuations of the subsequent modes. Mounting the polarizer in front of the lens of the camera it becomes possible to determine on the same test stand the modal birefringence of orthogonal pair of modes of the same order.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 5; 818-820
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Point Spread Function of Asymmetrically Apodized Optical Systems with Complex Pupil Filters: The One-Dimensional Case with Slit Aperture
    Autorzy:
    Keshavulu Goud, M.
    Komala, R.
    Naresh Kumar Reddy, A.
    Goud, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419735.pdf
    Data publikacji:
    2012-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.25.Fx
    42.30.Kq
    42.79.Ci
    Opis:
    Aimed at high resolution, an asymmetric point spread function has been obtained with good and bad sides by introducing three level asymmetric pupil functions. The good side has decreased side lobes while the bad side has increased side lobes. The asymmetry has been found to increase with the width of the edge strips within the slit aperture. On the other hand, there does not appear dependence of the asymmetry of the point spread function on the degree of amplitude apodization. But the magnitude of reduction of optical side-lobes is found to increase to a great extent by the amplitude apodization.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 1; 90-95
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Acoustic Anisotropy on Frequency Bandwidths of Bragg Diffraction in Two Orthogonally Polarized Diffraction Orders
    Autorzy:
    Zakharov, A.
    Voloshinov, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1383297.pdf
    Data publikacji:
    2015-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.25.Fx
    42.79.Jq
    43.35.Sx
    Opis:
    This paper theoretically and experimentally examines a specific regime of acousto-optic diffraction during which an arbitrarily polarized incident light in a paratellurite crystal is scattered simultaneously into two orthogonally polarized diffraction maxima. We examined acoustic energy walk-off in the crystal and its influence on phase matching as well as on distribution of light energy between the two diffraction orders. This influence was theoretically considered by means of wave vector diagrams illustrating momentum conservation law during the photon-phonon interaction. We obtained expressions for mismatch parameters in the ordinary +1 and extraordinary -1 diffraction orders both depending on the walk-off angle. The obtained parameters were used in the Raman-Nath system of coupled-wave equations to calculate the diffracted light intensities and frequency bandwidths of diffraction. We measured the bandwidths in experiments carried out in the (11̅0) plane of paratellurite crystal at the walk-off angle equal to 54°.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 1; 63-65
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Extinction Paradox
    Autorzy:
    Żakowicz, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2030470.pdf
    Data publikacji:
    2002-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.80.Cy
    42.25.Fx
    61.10.Dp
    Opis:
    The extinction paradox, the difference of classical and quantum scattering cross-sections for the scattering of particles by a rigid sphere (σ$\text{}^{Q}$=2π a$\text{}^{2}$=2σ$\text{}^{C}$ for ka ≫ 1), is analyzed in a simpler 2D model of a rigid cylindrical potential. Rigorous solutions of the Schrödinger equation for particle beams, including also finite width beams, are derived and employed in the description of the scattering process. The scattering particle fluxes, with a thorough treatment of the forward directions, are being studied. It is pointed out that for wide beams (w ≫ a) the scattered flux can reach the value determined by the quantum theory, provided that it is measured at distances R ≫ waλ. Moderately narrow beams (1≪ w≪ a) behave as classical trajectories, and their scattering can be described in classical terms. Thus, the classical limit of quantum scattering requires not only that the de Broglie wavelength λ$\text{}_{B}$ is much smaller than the size of the scatterer (a ≫ λ$\text{}_{B}$), but also that the transverse width of beams of de Broglie's waves is small, w≪ a.
    Źródło:
    Acta Physica Polonica A; 2002, 101, 3; 369-385
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magneto-Optic Periodic Strip Structures
    Autorzy:
    Ciprian, D.
    Pištora, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014935.pdf
    Data publikacji:
    2001-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.25.Fx
    78.20.Ls
    75.70.-i
    Opis:
    The paper deals with the optical response from periodic lamellar magnetic structure consisting of permalloy strips on Si substrate covered by Cr protection layer. The ultrathin structure is magnetized in polar geometry and the spectral dependence of magneto-optic response is computed using rigorous coupled wave analysis. The results are compared with the data obtained from magneto-optical ellipsometry experiments. Further model computation helps to understand the basic features of the Kerr rotation spectra and reveal the possible reason of deviation between the experimental data and the model computation.
    Źródło:
    Acta Physica Polonica A; 2001, 99, 1; 33-46
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Imperfect Cloaking Devices Based on Metamaterials
    Autorzy:
    Isić, G.
    Gajić, R.
    Novaković, B.
    Popović, Z. V.
    Hingerl, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047887.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    41.20.Jb
    42.25.Fx
    78.20.Ci
    Opis:
    Cloaking devices designed using the coordinate transform approach were shown to be realizable, at least in principle, within the realm of electromagnetic metamaterials. In this paper we investigate the strictness of conditions imposed on the parameters of metamaterial cloaks by calculating the degree of wave scattering when those parameters have variations with respect to theoretically ideal values. A simple idea is used to obtain analytic results for the case of the nonideal two-dimensional cloaking cylinder. Also, results of realistic finite element simulations of the Helmholtz equation are presented and it is found that they are in excellent agreement with the analytic results.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 1083-1088
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Holographic Interferometer as a Correlator of Phase Distortions with Response in the Form of Interference Pattern
    Autorzy:
    Derzhypolska, L. A.
    Gnatovskiy, O. V.
    Yezhov, P. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047890.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.25.Dd
    42.25.Fx
    42.25.Hz
    42.25.Kb
    42.30.Ms
    Opis:
    Considered in the work are known properties of holographic interferometer as according to the correlator with output signal in the form of interference fringes. It is known that a space correlation has various ratios of intensity between central correlation peak and background part for objects with different phase microrelief of a surface. Correspondingly an interference pattern must have different space distribution of contrast. A magnitude of contrast depends on changes in distribution of microrelief of investigated object, whereas the interference pattern depends on macroscopic modification of a form of the object. Used here is a scheme of Fourier holography with a random phase modulator in signal beam, reference beam is a point source, and restoring beam is the random phase modulator with random phase shift against initial random phase modulator. Also investigated is a recording of holographic interferogram with these random phase modulators. As the results of original theoretical consideration there was obtained an expression for fringe contrast and intensity of correlation peak. This model was tested by simulating of forming of holographic interferogram and reconstruction of the cross-correlation peak with phase distortions of various statistical distributions. Compared here are theoretical results, simulation results, and results obtained in real experiment.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 1095-1100
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Anderson Localization of Electromagnetic Waves in Dielectric Media: Model Studies
    Autorzy:
    Rusek, M.
    Orłowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044616.pdf
    Data publikacji:
    2006-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.25.Fx
    42.25.Hz
    72.10.Fk
    78.20.Ci
    Opis:
    Anderson localization of electromagnetic waves in random arrays of dielectric cylinders confined within a planar metallic waveguide is studied. The disordered dielectric medium is modeled by a system of randomly distributed 2D electric dipoles. An effective theoretical approach based on the method of images is developed. A clear distinction between isolated localized waves (which exist in finite media) and the band of localized waves (which appears only in the limit of the infinite medium) is presented. The Anderson transition emerging in the limit of an infinite medium is observed both in finite size scaling analysis of transmission and in the properties of the spectra of some random matrices. The sound physical interpretation of the obtained results suggests deeper insight into the existing experimental and theoretical work.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 1; 109-119
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Laser Sheet Scattering and the Cameras Positions in Particle Image Velocimetry
    Autorzy:
    Ilić, J.
    Čantrak, Dj.
    Srećković, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047893.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.25.Fx
    42.62.Eh
    42.68.Mj
    42.79.Qx
    Opis:
    Simulations of laser sheet scattering by microparticles, based on the generalized Lorenz-Mie theory for the case of numerous random spatial distributions of scattering particles, were done, using the novel computational time saving strategy. This type of scattering by particles immersed in a fluid flow and its recording on cameras, presents the essence of particle image velocimetry systems. The continuous and large change of the intensity of a scattered light falling on the camera causes the sequences of images of varying quality, which makes many of them useless. This paper shows how the problem could be alleviated by determining the angles of low relative standard deviation of scattered light intensity and using them for recording, as well as by avoiding the angles of high relative standard deviation of scattered light intensity.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 1113-1118
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quasi-Collinear Acousto-Optic Interaction in Inhomogeneous Acoustic Field
    Autorzy:
    Maslakov, A.
    Trushin, A.
    Voloshinov, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1383207.pdf
    Data publikacji:
    2015-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.79.Jq
    42.79.Ci
    42.30.-d
    42.25.Fx
    Opis:
    In studying characteristics of quasi-collinear acousto-optic tunable filters, we observed a new effect not explained by existing theories. As found, at high levels of driving power corresponding to high diffraction efficiency, a transition of energy from a diffracted light beam to a non-diffracted one vanished. In addition, the increase of the acoustic power was accompanied by a significant broadening of the filter frequency bandwidth. This effect could not be described in terms of the traditional consideration of acousto-optic diffraction based on a plane wave approximation and a model of a homogeneous acoustic column. The goal of this research was to develop a mathematical model capable of a correct description of the new effects. The paper examines a case of the quasi-collinear acousto-optic diffraction taking into account the two-dimensional spatial structure of the acoustic field. We gave a theoretical description of the effect of diffracted light beam intensity saturation at high level of acoustic driving power. It was shown that this effect was caused by the diffraction distortion of the acoustic field phase fronts in the plane of the acousto-optic interaction.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 1; 46-48
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetooptics in Layered Nonlinear Structures
    Autorzy:
    Boardman, A. D.
    Xie, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035662.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.Tg
    42.65.Wi
    42.25.Fx
    78.20.Ls
    Opis:
    The magnetooptics of an asymmetric layered waveguide structure is discussed to investigate the possibility of creating new devices that combine both nonreciprocity and nonlinearity. After addressing some fundamental magnetooptic properties and the kind of materials needed, a straightforward envelope theory is given that exploits the Voigt effect instead of the more obvious Faraday effect. It is emphasised that this choice leads to desirable design features. It is proposed that the introduction of an applied magnetic field to a waveguide structure can be achieved through the use of thin current-carrying strips. It is emphasised that the strips can be arranged to any degree of complexity and that a high degree of control over spatial soliton dynamics can be achieved. Spatial soliton light beams are selected because they can be generated, within a waveguide, in a stable form. The attractive features of using the type of magnetooptic waveguide investigated here are highlighted with examples and it is concluded that the formats proposed can be used for the fully integrated isolator capacity that modern laser systems demand.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 2-3; 121-131
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Scattering of Light by Photonic Crystals
    Autorzy:
    Hoenders, B. J.
    Doosje, M.
    Knoester, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2030312.pdf
    Data publikacji:
    2002-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.Qs
    42.25.Fx
    42.25.Bs
    03.50.De
    41.20.Jb
    Opis:
    A new method is developed to calculate the scattering of light at the surface of a photonic crystal. The problem is solved in terms of virtual surface-current distributions and the calculation takes full advantage of the infinite-space plane-wave expansion method for obtaining the photonic band structure. Working with surface currents makes the calculations less time-consuming by means of reduction of the dimensionality in the problem. The method is applied to a semi-infinite dielectric continuum and for semi-infinite two-dimensional photonic crystals of small and large dielectric contrast.
    Źródło:
    Acta Physica Polonica A; 2002, 101, 1; 133-146
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coherent Beam Splitting by a Thin Grating
    Autorzy:
    Božić, M.
    Dimić, D.
    Davidović, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791193.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.75.-b
    03.75.Be
    03.75.Dg
    42.25.Fx
    42.25.Hz
    Opis:
    The wide use of beam splitters in quantum interferometry, attosecond metrology, modern quantum information processing, foundations of quantum mechanics, has been based on coherence of beams emerging from a beam splitter. Here we further develop the approach in which a beam splitter is regarded as a transformer of an incident wave field (photon field or matter wave field) into a field which has narrow maxima at the points along and in close vicinity of two or more particular lines. This description was derived by considering a thin grating as a model of a beam splitter for photons, atoms and molecules. It is applied to answer some questions raised in the discussions on the interpretation of wave particle duality.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 479-482
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optoelectronic Device Based on Gunn Effect Extended Diode Structure
    Autorzy:
    Tralle, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047347.pdf
    Data publikacji:
    2007-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.25.Fx
    42.79.Dj
    42.79.Gn
    42.82.Et
    42.82.Fv
    Opis:
    We discuss the possibility of light control by means of light diffraction by space charge waves which are the periodic domain trains induced at some circumstances in GaAs Gunn effect diode. The two possible regimes of the proposed device are considered: the first one which is analogous to the Bragg diffraction in case of light-acoustic diffraction and the other one, which we call "intermediate", since the parameter Q which distinguishes the Raman-Nath (Q<1) and the Bragg diffraction (Q>10), in this case is≈1 (actually, only bit smaller than 1). Among the advantages of this hypothetical device are the simpler control of operation and perhaps, possibility to couple it with the waveguides and switchers for surface electromagnetic waves and other miniaturized photonic circuits.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 6; 835-846
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Light-Induced Scattering and Energy Transfer between Orthogonally-Polarized Waves
    Autorzy:
    Ellabban, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812354.pdf
    Data publikacji:
    2008-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.Hw
    42.40.Ht
    42.40.Eq
    42.25.Fx
    72.40.+w
    Opis:
    We present a detailed experimental investigation on polarization-isotropic and polarization-anisotropic holographic scattering in lithium niobate crystal doped with iron when recording parasitic gratings with an ordinary polarized pump beam. The kinetics of both types of scattering during the whole process of recording are studied. Holographic scattering is presented as a simple technique to monitor the energy transfer between beams of different polarization. Moreover, the spectral and the angular dependence of the transmitted intensity of the crystal during the reconstruction of the auto-generated parasitic gratings are measured.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 6; 1647-1658
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transformation of Hyperfine Interactions in Co-Substituted Nanoperm-Type Alloys during Annealing
    Autorzy:
    Hatala, T.
    Miglierini, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1507056.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    71.55.Jv
    42.25.Fx
    75.75.-c
    Opis:
    Structure and magnetic order of rapidly quenched $(Fe_{1-x}Co_{x})_{79}Mo_8Cu_1B_{12}$ alloys is investigated by $\text{}^{57}Fe$ Mössbauer spectrometry in transmission geometry and by conversion electron Mössbauer spectrometry. The effect of heat treatment upon hyperfine interactions was studied as a function of Co contents (x = 0, 0.5). Magnetic dipole interactions developed in both alloys when sufficient number of ferromagnetic nanograins is created after heat treatment. The kinetics of crystallization was derived from in situ diffraction of synchrotron radiation. The progress of crystallization is different at both sides of the ribbon-shaped samples.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 764-765
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Optical Hydrophone for the Single-Shot Field Measurements of High Power Pressure Pulse Fields
    Autorzy:
    Jamshidi-Rad, A.
    Ueberle, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1383349.pdf
    Data publikacji:
    2015-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    06.20.-f
    42.25.Fx
    43.35.Sx
    43.35.Yb
    Opis:
    The measurements of ultrasonic fields are often performed using polyvinylidene fluoride (PVDF) membrane hydrophones. Recently, optical hydrophones have gained popularity. Refractive type optical hydrophones are based on the change of refractive index at a glass-water interface when the shockwave passes the sensitive area. A major disadvantage of the optical and the PVDF hydrophones is the fact that they provide a single spot sensitive area, with the result that field measurements need a repositioning of the probe. In this work we introduce a multi-spot optical hydrophone with six measurement spots, for the single shot field measurement of shockwave fields. We measure a highly stable shockwave source with a calibrated hydrophone and the multi-spot optical hydrophone and we find good agreement for the calculated energy values of the shockwave field (depending on the energy settings 4% ± 1%).
    Źródło:
    Acta Physica Polonica A; 2015, 127, 1; 69-71
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Refractive Indices Dispersion on Parameters of Imaging AOTFs Operating with Non-Polarized Light
    Autorzy:
    Yukhnevich, T. V.
    Voloshinov, V. B.
    Pritulenko, I. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2048161.pdf
    Data publikacji:
    2015-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.25.Fx
    42.25.Ja
    42.25.Lc
    42.30.Va
    42.79.Jq
    43.38.+n
    43.35.+d
    Opis:
    The paper presents results on investigation of paratellurite based imaging tunable acousto-optic filters operating with arbitrary polarized light. We analyzed influence of dispersion of refractive indices in the crystal on a simultaneous satisfaction of the Bragg matching condition for ordinary and extraordinary polarized optical beams. The analysis was carried out at different optical wavelengths over the wide tuning range of the filters 400-1150 nm. Theoretical and experimental analysis of the problem proves that in a paratellurite tunable acousto-optic filter, the Bragg matching angle common for the two optical polarizations is varying in the limits up to 0.3°. This variation of the incidence angle may be as wide as a quarter of the filter angular aperture thus proving that the examined phenomenon should be considered in design of the imaging tunable acousto-optic filters.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 1; 78-80
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-25 z 25

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