Transversal diffraction autosolitones present in optical system containing Kerr nonlinear slice, Zemike filter and feedback mirror are mathematically described. Model ofthis system utilizing liquid crystal -photoconductor spatial light modulator is experimentally investigated. Optical array memory device for digital infonnation storage based on these autosolitones is experimentally developed.
A fine scale drift wave mode possessing unusually high frequency 2-3 MHz and radial wave number is observed using the correlative upper hybrid resonance backscattering technique at the FT-2 tokamak under conditions when the ETG mode should be unstable. The radial wave number spectrum of turbulence is measured and shown to be maximal at values 120-170 cm −1 corresponding to the largest ETG instability growth rate.
A giant linear electro-optics (Pockels) effect (up to 17 pm V −1 ) (for wavelength about 435 nm) in ZnO crystalline films doped with fluorine and deposited on bare glass has been found. For description of the observed phenomenon, a complex approach including self-consistent band structure calculations together with an appropriate molecular dynamics simulation of the interface structure was applied. Experimental ellipsometric and refractive index measurements confirm an efficiency of the mentioned approach for description of the observed interface (between the film and glass) processes. The origin of the observed effect is caused by substantial non-centrosymmetric charge density distribution between the ZnO wurtzite-like crystalline films and the bare glass substrate, as well as by additional charge density polarization caused by fluorine atoms.(Some figures in this article are in colour only in the electronic version)
We have measured the low-temperature specific heats in the range 1.5-6 K, the magnetic susceptibilities in the range 77-300 K and the electrical resistivities in the range 2-300 K for four Ni,m-xTix (x=40, 55, 65 and 70) metallic glasses. The density of states near the Fermi level is found to be an increasing function of Ti concentration. A detailed comparison has been made on the electronic structure among the four similar metallic glasses Cu-Zr, Cu-Ti, Ni-Zr and Ni-Ti. The Debye temperature & in Ni-Ti is found to be the highest among these four systems. The Debye temperature & is discussed in relation to the crystallisation temperature T, and also the characteristic temperature A involved in an expression for the temperature dependence of the electrical resistivity.
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