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10th International Conference on Laser and Fiber-Optical Networks Modeling (LFNM 2010). 2nd IEEE International Workshop on THz Radiation: Basic Research and Applications (TERA 2010)
Outside the framework of the dipole approximation (with an accuracy of about v/c) the effective interaction force between stripped uranium nuclei in the presence pulsed field of two laser waves is theoretically studied. Possibility of essential slowing-down of uranium nuclei after interaction with each other is obtained. The given phenomenon is stable, concerning minor changes of initial conditions...
The properties of the optical connection of single-mode fibers by laser beams counter-propagating from the ends of these fibers are considered numerically and experimentally. It is established that effective connection of single-mode fibers at the wavelength of 1.55 μm is possible during self-channeling and interaction of optical beams at 0.63 μm in a photo-polymerizing medium. It is shown by computer...
We study de nonlinear optical properties of organic materials. Multiple rings appear as a CW Ar laser passes through a nonlinear organic liquid. The rings formation is due to spatial self-phase modulation and is observed with 50 mW of continuous wave of Ar laser. We show the dependence between power and rings formed. As a first approximation to value the nonlinear refractive index we use the number...
The process of optical formation of dielectric waveguiding structures in transparent photopolymerizable composition (PPC) containing non-polymerizable component (NC) is considered. It is shown, that using NC does not break modes of influencing radiation self-channeling, and on the contrary, allows to provide conditions of matching of the synthesized waveguiding structures with optical fibers. Results...
The behaviour of a scalar optical beam at the boundary between two dissimilar nonlinear media is of fundamental interest in photonics. Here, we report the first systematic generalization of our Kerr analyses to a wider class of power-law materials. Universal refraction laws will be given, and theory-simulation agreement demonstrated.
Theoretical model of how LBIC signal from p-n junction being scanned by two laser beams is formed was proposed. Physical effects which make impact in overall phase of the LBIC signal were pointed out. Experimental research of illuminating surface of laser diode was conducted. Experimental dependencies of the phase of LBIC signal on the coordinate of scanning laser beams were obtained. Possibilities...
Modeling of the random lasing in diffusive regime by Monte-Carlo method and Kubelka-Munk theory has been carried out. It has been obtained the experiment-corresponded dependencies of radiation parameters on media characteristics. The optimal samples parameters for effective lasing have been found.
We propose ultra-compact all-optical XOR and AND logic gates based on multi-mode interference (MMI) without using nonlinear optics. Numerical simulations show that the least ON to OFF logic-level contrast ratio is 13.3 dB for XOR logic gate and 4.3 dB for AND logic gate in the whole C-band.
The resonant scattering of a photon by an electron through direct diagram was studied in the low intense pulsed plane wave. The resonant amplitude and the cross-section were obtained. It is shown that the resonant cross-section is several orders of magnitude greater than the nonresonant one.
The scattering of Gaussian beam on the metamaterial slab with negative refractive index is considered. Modeling is based on the spectral decomposition of the beam field in plane waves. The effect of different parameters on the polarization characteristics of the electromagnetic field reflected from the metamaterial layer and transmitted through it is investigated. The possibility of control of the...
Nonlinear-optical response of metal-alkanoates anisotropic glasses based on cobalt-alkanoate was studied using method of the dynamic holography. Fundamental optical (refractive index n and absorption coefficient α) and nonlinear-optical (nonlinear susceptibilities χ(3) and polarizabilities γNL) parameters of the mesomorphic glasses based on cobalt-alkanoates can be tuned via varying chain length anion...
Double-charge femtosecond vortices were synthesized with the polarization-singularity beam converter [1]. The vortex was focused using moderate and high numerical aperture optics (NA = 0.45 and 0.9) to ablate fused silica and soda-lime glasses. The results demonstrate that the ablation can be controlled on a sub-micrometer scale with a high degree of repeatability.
The experimental results causing the trench of subwavelength nanostructures formation in semiconductor's 4H-SiC surface and inside volume along the femtosecond beam path are considered. The given qualitative explanation of the observed phenomenon is based on universal polariton model of laser-induced material damage with extension of excitation the cylindrical surface plasmon polaritons and their...
In this paper we propose an efficient numerical technique to model the propagation of an ultrashort pulsed optical beam in dispersive dielectric medium. The method has been efficiently used for the modeling of non-dispersive medium. A moving numerical time window along the propagation of the field allows large saving of computational time and memory in comparison with the conventional FDTD to solve...
Temperature dependences of electron threshold current density in ZnSe-based laser heterostructures for the temperature range of 12-300 K and electron energies of 3.5-8.1 keV have been studied in detail. The minimum value of threshold current density of 0.2 A/cm2 has been measured at the electron energy E = 8 keV and temperature T = 50 K. The analysis of experimental and simulated data indicates on...
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