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Laser and Fiber-Optical Networks Modeling (LFNM), 2013 12th International Conference on

Date 11-13 Sept. 2013

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Displaying Results 1 - 25 of 37
  • [Front cover]

    Publication Year: 2013 , Page(s): 1
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    Freely Available from IEEE
  • [Copyright notice]

    Publication Year: 2013 , Page(s): 1
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    Freely Available from IEEE
  • Program committee

    Publication Year: 2013 , Page(s): I
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  • Contents

    Publication Year: 2013 , Page(s): II - III
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    Freely Available from IEEE
  • Designing optical filters with electrical models of photonic crystal defects

    Publication Year: 2013 , Page(s): 1 - 3
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    A systematic approach for designing photonic crystal based band-pass filters with different filter characteristics has been presented in this paper. The filter characteristics are manipulated by varying the location of the defects in a photonic crystal waveguide. The photonic crystal waveguide is modeled as a dispersive transmission line and the defects are modeled by equivalent electrical T-networks. A filter then is visualized as a cascade of the T-networks with suitable interconnecting sections of transmission line. S-parameters are used to find the transmission and reflection frequency response of the filter. An optimization approach is used to obtain the most optimal locations of the defects which give the desired frequency response. It is shown that more than one defect combinations are possible for getting the desired filter characteristics. View full abstract»

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  • Influence of the moderate-strong pulsed laser field at the quantum electrodynamics processes

    Publication Year: 2013 , Page(s): 4 - 9
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    The review on the quantum electrodynamics (QED) processes proceeding in the moderate-strong pulsed light fields, realized in modern powerful pulsed lasers is presented. Resonant and nonresonant processes of quantum electrodynamics in strong laser fields are considered. Following QED processes of the second order in the fine structure constant in the pulsed laser field are considered: resonant and nonresonant spontaneous bremsstrahlung by an electron scattered by a nucleus, resonant and nonresonant scattering of a lepton by a lepton. The resonant peak's altitude and width are defined by the external pulsed wave properties. It is demonstrated that the resonant cross sections may be several orders of magnitude greater than the corresponding cross sections in the absence of an external field. Results obtained may be experimentally verified, for example, by the scientific facilities at the SLAC National Accelerator Laboratory and FAIR (Facility for Antiproton and Ion Research, Darmstadt, Germany). View full abstract»

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  • Role of periodicity in the scattering by a cloud of randomly located plasmonic nanowires

    Publication Year: 2013 , Page(s): 10 - 12
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    We consider the problem of the H-polarized plane wave scattering by a linear chain of silver nanowires in a cloud of similar arbitrarily located wires, in the visible range. Numerical solution uses the field expansions in local coordinates and addition theorems for cylindrical functions and has a guaranteed convergence. The total scattering cross-sections and near-zone and far-zone field patterns are presented. The observed resonance effects are studied and compared with their counterparts in the scattering by the same linear chain of wires in free space. View full abstract»

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  • Population dynamics in GaN/AlGaN quantum cascade structure under femtosecond pumping

    Publication Year: 2013 , Page(s): 13 - 14
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    Basing on the density matrix theory we have developed the theoretical model electron transport in GaN/AlGaN photodetectors including both coherent and incoherent constituents. The lifetimes utilized in the model are computed using Fermi's Golden Rule approach. The computational efficiency of the model is caused by a series of approximations, the most crucial of which is the thermalization model for electron distribution functions belonging to subbands. Obtained results evidence that depending on the molar fraction of the Al in AlGaN semiconductor alloy the electron transport can be governed by the coherent process or incoherent one basing on the electron-phonon scatterings mainly. View full abstract»

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  • Pair production to the lowest Landau levels by an electron in a magnetic field

    Publication Year: 2013 , Page(s): 15 - 16
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1351 KB) |  | HTML iconHTML  

    The process of electron positron pair production by an electron in a magnetic field has been studied in the lowest Landau levels (LLL) approximation. The process is most probable if the initial electron and the positron spins oriented along the field while the spins of the final electrons are oriented against the field. The process rate has been calculated for the indicated spin projections. View full abstract»

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  • Class D lasers vs. class B lasers: Dynamical spectra analysis

    Publication Year: 2013 , Page(s): 17 - 19
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    The numerical modeling and comparative analysis of multimode generation regimes is carried out for two alternative classes (B and D) of lasers with distributed feedback and strong in-homogeneous broadening of an active medium, where opposite relations between a photon lifetime and a polarization lifetime take place. View full abstract»

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  • Dumping effect on the forming of negative dielectric properties in crystal

    Publication Year: 2013 , Page(s): 20 - 22
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5017 KB) |  | HTML iconHTML  

    The physical conditions analysis for the appearance of negative values of the dielectric function (DF) within the T-L splitting frequency interval in polar crystals is presented. The simple quantitative criterion for existence of negative DF band is derived in the three equivalent forms as a proper combination of basic parameters of a single phonon vibration. Principal significance of the phonon damping will be demonstrated in report especially for the realization possibility for the wave penetration process of in the negative dielectric region. It is shown the phonon damping may transform the wave to evanescent type in the negative dielectric area or moreover it may also cause the collapse of the transmitted wave in a narrow layer near the crystal surface, several times less than the wavelength of incoming radiation. View full abstract»

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  • Interference of counter-propagating electromagnetic pulses on a dielectric slab

    Publication Year: 2013 , Page(s): 23 - 25
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    In the present paper the dynamics of interaction of counter-propagating pulses on a dielectric slab is studied. The possibility of redistribution of energy in the counter-propagating pulses is shown. The maximal energy redistribution in the diffracted field takes place under certain conditions. The conditions are found and its physical explanation is supplied. The problem of transient electromagnetic wave diffraction on homogeneous magneto-dielectric slab is solved analytically via Laplace transform. The analytical solution is in agreement with numerical simulation based on finite difference time domain approach. View full abstract»

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  • Nonrelativistic electron scattering on a nucleus in the field of a bichromatic laser pulse

    Publication Year: 2013 , Page(s): 26 - 28
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    Electron scattering on a nucleus in the field of a bichromatic pulsed laser wave is considered in the nonrelativistic case. The interference effect was detected when an electron scatters in the plane determined by the direction of laser wave propagation and the initial electron momentum. The electron emits and absorbs photons of both waves in a correlated manner in the interference region. Widening of partial differential cross sections is studied near the interference exit angle of the electron. It is shown that the partial probability of stimulated processes in the interference region may be five orders of the magnitude greater than corresponding probability of processes in any other geometry. The results may be experimentally verified, for example, in the FAIR project. View full abstract»

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  • Modeling of correctional amendments for pulse laser distance meter

    Publication Year: 2013 , Page(s): 29 - 31
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    Methods to form the correctional amendments for compensation of walk errors in real-time are investigated. Mathematical models of the correctional amendments are developed. Simulation of the process to form the amendments is carried out. Efficiency of error compensation methods is evaluated. View full abstract»

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  • One-photon emission of electron in the field two pulsed laser waves

    Publication Year: 2013 , Page(s): 32 - 34
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1522 KB) |  | HTML iconHTML  

    The process of one-photon emission by an electron in the field of two pulsed circularly polarized laser waves was studied. The probability of process was obtained. It is shown that the probability process of one-photon emission in interference domain may be greater then out it. The results can be tested in the experiments on the verification of quantum electrodynamics in the presence of strong fields (SLAC and FAIR). View full abstract»

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  • Gain coefficient in the course of the electron scattering by ions in a weak electromagnetic field: General relativistic case

    Publication Year: 2013 , Page(s): 35 - 37
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    For weak electromagnetic field the gain coefficient in the scattering of electrons by ions in the elliptically polarized light wave is theoretically studied in the general relativistic case. Simple analytical expression for a field amplification constant in logarithmic approach is obtained. It is shown for the ultrarelativistic electron energies the gain coefficient depends on energy as a cubic degree of energy and can be major enough. Results obtained may be experimentally verified, for example, by the scientific facilities at the SLAC National Accelerator Laboratory and FAIR (Facility for Antiproton and Ion Research, Darmstadt, Germany). View full abstract»

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  • Accurate calculation of hole bound states in quantum wells with polynomial potential profile

    Publication Year: 2013 , Page(s): 38 - 40
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    We demonstrate an explicit numerical method for accurate solving the eigenvalue problem for systems of coupled ordinary differential equations such as those describing hole bound states in quantum wells with a polynomial potential profile. Hole bound states energies and corresponding wave functions are calculated in the case of a finite parabolic quantum well. View full abstract»

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  • Formation of an electron-positron pair by a photon in the field of two pulsed laser waves

    Publication Year: 2013 , Page(s): 41 - 43
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1449 KB) |  | HTML iconHTML  

    The process of a formation of an electron-positron pair by a photon in the field of two pulsed circularly polarized laser waves was studied theoretically. The probability of studied process was obtained. It is shown that the probability process of formation of an electron-positron pair in an interference domain may be greater then out it. View full abstract»

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  • Fiber attenuation irregularities and simulation of Raman amplification band

    Publication Year: 2013 , Page(s): 44 - 46
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3526 KB) |  | HTML iconHTML  

    Analytical expression of wavelength dependence of signal attenuation coefficient in the range of S+L+C telecommunication window is obtained using polynomial approximation in single-mode silica fibers: DCF, TrueWaveRSTM and pure SMF. It allowed correcting the threshold conditions of Raman amplification. It is shown that Raman gain threshold increased adjusted for wavelength irregularity of attenuation in comparison with threshold at constant attenuation of optical wave. It led to significant narrowing of Raman amplification band by-turn, especially up to a few THz in DCF. Presented technique of simulation of Raman amplification band is useful for designing of wideband fiber Raman amplifiers. View full abstract»

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  • Laser-modified Compton scattering in the middle-intensity pulsed field

    Publication Year: 2013 , Page(s): 47 - 49
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    The scattering of photon by electron in the presence of the field of the middle-intensity circularly-polarized pulsed laser wave is analyzed at a laser pulse duration that is significantly greater than the characteristic oscillation time. The probability of such process is calculated for a range of external field intensities I ~ 1017 Wcm-2. It is demonstrated that the resonance probability of laser-modified process can be significantly greater than the probability of the Compton effect in the absence of the external field. In the range of the optical frequencies for nonrelativistic energies this excess relates amounts to four orders-of-magnitude. View full abstract»

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  • Interference e-μ scattering in two-mode pulse-wave laser field

    Publication Year: 2013 , Page(s): 50 - 52
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    Nonresonant process of electron scattering at the muon in the two-pulse field circularly polarized moderately strong electromagnetic waves in the interference region (IO) has been studied theoretically. A significant increase of the partial-scattering cross section of the process is found even in case of moderate laser pulse intensities. View full abstract»

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  • Energy loss of a charged particle in an electron gas in the second Born approximation

    Publication Year: 2013 , Page(s): 53 - 54
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    The scattering of a charged particle moving in an electron gas by quantum field theory methods has been reviewed. Probability of the process in the first Born approximation has been obtained (without the use of the Green's function). The analysis of the general expression for the probability in the second Born approximation has been done. View full abstract»

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  • Calculation of the electron thermal plasma permittivity

    Publication Year: 2013 , Page(s): 55 - 57
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    The expression for the permittivity of the electron gas with considering the temperature in the framework of quantum field theory is numerically calculated. The results are compared with analytical expressions that take into account temperature of the electron gas in the linear approximation. View full abstract»

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  • Resonance interference scattering of a lepton by a lepton in the bichromatic pulsed laser field

    Publication Year: 2013 , Page(s): 58 - 60
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    Resonance scattering of a lepton by a lepton in the field of two codirectional pulsed laser waves within the interference kinematical region is theoretically studied. Stimulated emission and absorption of waves' photons by lepton is correlated in the interference region. Resonance conditions in the interference region are specified. Analytical expressions for amplitude and differential cross section for circular polarization are obtained. The cross section contains a resonant peak, its altitude and width are determined by external waves parameters. Considerable effect of wave polarization on scattering of a lepton by a lepton is specified. The obtained results can be verified at the facility FAIR (Darmstadt, Germany). View full abstract»

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  • Soliton-like behavior of electrons in the electron cooling

    Publication Year: 2013 , Page(s): 61 - 63
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    Simulation of electron movement on a string in the presence of a charged particle is carried out. A sharp peak is found in dependence of the transferred energy on the impact parameter for the scattering of an electron on a negatively charged particle in the accompanying reference frame. Movement of the electron has soliton-like character near the peak. View full abstract»

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