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Journal of Telecommunications and Information Technology
2006 nr 4 96-101
EN This report presents principal optical properties of semiconducting large-sized nanocrystalline (LSNC) material with thickness within 10-50 nm range. A quantitative parameter for description of the LSNC state is introduced. Influence of the surrounding polymer matrices on the properties of the LSNC [...]
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Optica Applicata
2006 Vol. 36, nr 4 s. 575--580
EN When looking for solitons in nonlinear systems, it is often useful to have a simplifying tool. One such tool is the variational method. On the other hand, in the presence of fast oscillations, the wavefunction of the system can split into two distinct parts. This is not describable by the classical [...]
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Optica Applicata
EN Influence of CO2 pulsed microsecond laser on two-photon absorption (TPA) at wavelengths of Nd:YAG (1060 nm and 1320 nm) and Er glass lasers (1540 nm) for As2Se2S glasses was studied. Dependence of the TPA versus the photoinducing power densities at wavelength 9.2 ?m is studied. The highest values of[...]
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Opto - Electronics Review
EN We have demonstrated the co-existences of second harmonic generation (SHG) and χ (2) grating using acoustical and optical fields in Ru derivatives incorporated within the PMMA polymer matrices. The investigated compounds possess metastable trapping levels originated both from the d-states[...]
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Journal of Telecommunications and Information Technology
2009 nr 1 34-37
EN We report about a novel kind of supercontinuum generation in a photonic crystal fibre in which the spectral broadening occurs only on the blue side of the pump wavelength. As a consequence a limit to the extent of the supercontinuum is set and thus a way for tailoring the broadened spectrum accordin[...]
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Optica Applicata
EN It is shown that the interaction of two strong pumps with four weak signal beams, not coplanar with the pump beam, gives rise to the exponential amplification of the weak beams in a Kerr-type negative medium. The theory developed is applied to the case of noise formation in iron-doped lithium niobat[...]
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Opto - Electronics Review
EN In this paper the size-dependence of energy relaxation, which is induced by the electron-phonon (e-ph) interactions and the electron-surface (e-s) interactions in noble metal nanoparticles, is investigated. Then based on the analysis and the derivation of the e-s coupling constant in metal nanospher[...]
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Opto - Electronics Review
EN We investigated the formation and interaction of bright spatial solitons in photorefractive nonlinear media. We demonstrate solition formation, self-bending, coherent and incoherent collision resulting in energy exchange, solition fusion, birth of new solitions and anomalous repulsion of solitions. [...]
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Computational Methods in Science and Technology
EN In this presentation we intend to focus on the exchange of experience between nonlinear optics (optical pulse and beam propagation in nonlinear media) and atom optics (dynamics of coherent waves generated from Bose-Einstein condensates). A common ground here is the nonlinear Schrödinger equation, wh[...]
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Polish Journal of Chemistry
2007 Vol. 81, nr 5-6 1063-1070
EN Two new chiral 4-[(E)-2-ferrocenylvinyl]-1-methylpyridinium iodides, having in the 2-position of the ferrocenyl group (R)-1-N,N-dimethylaminoethyl and (S)-2-methoxymethylpyrrolidin- 1-yl substituents were synthesized. The latter compound showed weak second harmonic generation efficiency (0.5 x urea)[...]
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Optica Applicata
EN In this paper, an ultrafast optical switching for thin polymer films (polyarylans with allylic groups) is presented. It was realized using the Nd:YAG Sagnac interferometer. Investigated polymers appeared to be suitable candidates for elements of integrated optical telecommunication systems.
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Optica Applicata
EN The second-harmonic conversion efficiency was calculated for the biaxial molecular crystal (-)2-a-(methylbenzylamino)-5-nitropyridine (MBANP) under high power conditions. The de-pendence of the second-harmonic efficiency on the beam walk-off angles and the crystal length is discussed. A maximum effi[...]
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Polish Journal of Chemistry
2002 Vol. 76 / nr 10 1495-1503
EN Methacrylate monomers containing a carbazole fragment and a chromophoric azophenyl sulfonyl group were synthesized, being characterized as definite chemical species and as potential intermediates for photorefractive applications. Quantum chemical calculations were carried out to get values of dipole[...]
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Optica Applicata
2013 Vol. 43, nr 4 651--661
EN Thermo-optic and electrostrictive contributions to the nonlinear refractive index were observed in a titanium dioxide thin film with embedded gold nanoparticles. A sol–gel method was employed for preparing thin solid film samples. The nanosecond nonlinear optical properties and the Young’s modulus p[...]
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Optica Applicata
2014 Vol. 44, nr 3 389--398
EN In this paper, the experimental data on nonlinear refraction of silver nanoparticle composites using a standard Z-scan technique are presented. It was found that the colloids of silver nanoparticles of various size possess a defocusing ability. Based on general considerations, one can conclude therm[...]
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Optica Applicata
2018 Vol. 48, nr 3 349--359
EN We report that defect solitons can be supported by kagome photonic lattices with a defect in biased photovoltaic-photorefractive crystals. For a positive defect, these defect solitons exist only in the semi-infinite bandgap and are stable in the low power region but unstable in the high power region[...]
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Opto - Electronics Review
EN Discrete optical systems can be realized as arrays of parallel, weakly coupled, channel waveguides where light normally undergoes "discrete diffraction" via the weak coupling between adjacent channels. Here we describe how light can be forced to maintain a constant field profile on propagation in wa[...]
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Opto - Electronics Review
EN We present a summaty of the recent results of our studies of nonlinear localization effect in optically-induced periodic index structures in photorefractive crystals. We demonstrate the generation of spatial bright solutions, controllable excitation of gap solitons and their anomalous steering prope[...]
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Materials Science Poland
2019 Vol. 37, No. 3 310--316
EN An organic single crystal of 4-chloroanilinium hydrogen (2R,3R)-tartrate monohydrate (4CAHT) was grown by slow evaporation solution growth technique at room temperature. Single crystal XRD study confirmed that the crystal belongs to monoclinic system with the space group P21. Powder XRD a[...]
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Optica Applicata
EN This paper studies the perturbation theory of optical solitons with log law nonlinearity. The adiabatic dynamics of the Gausson parameters are determined in the presence of the perturbation terms. The fixed point is also found and finally the numerical simulation is carried out.
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