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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)
The transformation of an incident plane harmonic wave caused by instant creation of a plasma sphere is investigated. Two stages of field evolution is shown. At the early stage a spatial and temporal field structure is similar partly to the case of an unbounded medium. Transients in the form of a nonstationary wave spectrum are observed at the second stage. The exact expressions for the transformed...
The nonresonant scattering of a photon by an electron (Compton scattering) in the field of a pulsed light wave is investigated theoretically. The approximation when a pulsewidth is considerably greater than the characteristic time of the wave oscillation is considered. The analytical expressions for the amplitude and cross-section of mentioned process are derived. It is concluded, that the total cross-section...
The process of resonant scattering of a lepton by a lepton in the field of pulsed light wave in general relativistic case is studied theoretically. It is demonstrated, that the obtained resonant differential cross-section of the scattering of an electron by an electron (an electron by a positron, an electron by a muon) in the pulsed light field may be several orders of magnitude greater than the corresponding...
Resonant two-photon annihilation of an electron-positron pair in the field of a moderately strong circularly polarized wave is investigated theoretically. The partial cross-section is derived. It is shown that the resonant differential cross-section can differ from that in the absence of the external field.
Resonant spontaneous bremsstrahlung by an electron scattered by a nucleus in the field of pulsed light wave is theoretically investigated. The bremsstrahlung cross section contains a resonant peak. It is demonstrated, that the resonant cross section of the spontaneous bremsstrahlung may be several orders of magnitude greater than the corresponding cross section in the external field absence. Obtained...
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.
We have discovered that if input grating coupler is used to excite SEW the generated wave is differed essentially from SEW. This wave is conventionally named “pressed wave” by us. We examine the evolution of wave field with distance from input grating coupler and compare that with analogous dependence for SEW. It is shown that unlike SEW the intensity of pressed wave decreases not exponentially while...
Numerical calculations of energy characteristics of quantum-well structures based on Si1-xGex-Si have been performed using the four-band k·p method. It is shown that varying the thickness of the active layer and the height and width of potential barriers one can control the frequency ω of optical transitions. The analytical expressions for ħω are established, which are in good agreement with the numerical...
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...
The electromagnetic field amplification constant in the scattering of the nonrelativistic electrons by ions in the elliptically polarized light wave is theoretically studied for any intensities for which radiation amplification takes place. The anomalous amplification effect in the moderate-strong electro-magnetic field is predicted.
We report the spatial anisotropy of the acoustooptical figure of merit M2 in LiNbO3:MgO and GaP crystals. The analysis is based on the indicative surfaces being calculated for different geometries of the acoustooptical diffraction. Basing on these results the most efficient geometries of the acoustooptical cells made of these crystals are determined. It give a possibility to increase the application...
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