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51.
The method of strong interaction of nonlinear waves has been developed to analyse the second harmonic generation of intense laser radiation in the transient regime. Analytic solution for frequency conversion efficiency – taking into account the pump radiation depletion, influence of phase mismatch, dispersion of group velocities and higher nonlinearities – has been first obtained. A comparison of theoretically derived results and known experimental data has been conducted, and a general agreement of these results has been obtained. The optimal conditions of the second harmonic generation of neodymium laser radiation into femtosecond pulse duration range have been determined. 相似文献
52.
B. A. Ivanov G. G. Avanesyan A. V. Khvalkovskiy N. E. Kulagin C. E. Zaspel K. A. Zvezdin 《JETP Letters》2010,91(4):178-182
The dynamics of a magnetic vortex in a thin magnetically soft ferromagnetic disc with a submicron diameter has been analyzed.
Under the action of field pulses with a duration of the order of 10–100 ps, the vortex undergoes a complex motion. The analysis
of the results of a micromagnetic simulation indicates that this motion is non-Newtonian. It can be described by an equation
containing the third time derivative of the displacement of the vortex core. 相似文献
53.
V. V. Kulagin 《Optics and Spectroscopy》2001,91(4):551-556
The recording of weak classical forces with the help of a resonance optical detector without reciprocal effect is considered. Parametric regeneration of an optical cavity by way of introducing an additional quadratic nonlinear element with illumination at the double frequency is proposed for improving the sensitivity of the system. The limiting sensitivity of such a converter is estimated for a squeezed state of the pumping field and its outlook for practical realization are discussed. 相似文献
54.
N. A. Kulagin A. A. Levin E. Langer D. C. Meyer I. Doicinovic J. Puric 《Crystallography Reports》2008,53(6):1061-1067
The X-ray diffraction and X-ray spectroscopic properties of strontium titanate single crystals and their surface exposed to plasma have been investigated. Both undoped SrTiO3 crystals and crystals containing impurity ions of the iron or lanthanum groups have been analyzed. Data on the plasma-induced formation of ordered crystallites on the sample surface were obtained by electron and atomic force microscopy. The crystallites are from 10?7 to 10?9 m in size and their hypothetical orientation [321] is independent of the sample orientation and irradiation dose. 相似文献
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58.
N. S. Ginzburg N. I. Zaitsev E. V. Ilyakov I. S. Kulagin Yu. V. Novozhilova R. M. Rozental’ A. S. Sergeev 《Technical Physics》2001,46(11):1420-1427
Experimental and theoretical studies on the self-modulation mode of generation in a high-power BWT with the electrodynamic system representing a slightly corrugated waveguide are presented. The BWT is fed by an electron beam with the energy 150 keV and the current 150 A. The system operates at the E 01 mode with the mean frequency 8.7 GHz. Dynamic chaos is obtained by a three-fold increase in the length of the interaction space in comparison with the prototype exhibiting stationary generation. The stationary generation was changed to periodic sinusoidal self-modulation and then to chaotic self-modulation as the current increases from 6 to 60 A. The generation mode is simplified when the current ranges from 70 to 90 A and becomes complicated again for the current exceeding 100 A. Experimental observations are in good agreement with the results of simulation predicting a certain simplification of the self-modulation mode at the currents 70–90 A owing to the effect of high-frequency space charge. Under the conditions of chaotic generation, the mean power was as high as 2 MW at the relative spectral width of the signal 4% and the total duration of the microwave pulse 10 μs. 相似文献
59.
The results of the studies on the transformation of the frequency of laser radiation in polyimide films doped by C70 are presented. The nonlinear susceptibility (χ(3)) of polyimide 6B films with various concentrations of C70 is studied by third-harmonic generation. At a wavelength of 1064 nm, the value of χ(3)(−3ω; ω, ω, ω) is 9×10−13 esu. The effect of the nonlinear variation in the refractive index of the fullerene-containing films on the phase matching between the pumping and third-harmonic waves is analyzed. The third harmonic of the Nd: YAG laser radiation was generated with the efficiencies 6×10−6 and 10−6 in the films with the C70 concentration of 0.5 and 0.2%, respectively. 相似文献
60.
Semenov A. D. Golikova E. V. Grigor'ev V. S. Kulagin K. M. 《Russian Journal of General Chemistry》2002,72(1):17-25
Structural and mechanical properties of aqueous dispersions of Aerosil OX50 were studied by rotary viscometry. The thixotropic properties of concentrated (20-50 wt %) Aerosil dispersions used in the sol-gel synthesis of quartz glass are due to structurization caused by appreciable overlapping of the electrical double layers of the particles. The particle interaction occurring in a limited volume is accompanied by formation of periodic colloidal structures of the second kind. The viscoplastic properties and extrema in the pH dependence of the viscosity are explained in terms of collective interaction of Aerosil particles according to the Deryagin-Landau-Verwey-Overbeek (DLVO) theory. 相似文献