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1
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Optical Nonlinearities in PbSe Nanocrystals

100%
Aleksejenko G., Pačebutas V., Krotkus A.
Acta Physica Polonica A
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2005
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vol. 107
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issue 2
294-297
EN
The linear and nonlinear optical response of colloidal PbSe nanocrystals was investigated. Optical nonlinearity and its recovery dynamics in this system was measured and compared with other available experimental data. The saturation irradiance value for the bleaching effect and absorption cross-section were determined.
2
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Three-Frequency Wave Interactions in the Field of 100 fs Ti:Sapphire Laser pulse in PPLN

100%
Shutov I., Shumitsky A., Ozheredov I.
Acta Physica Polonica A
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2007
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vol. 112
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issue 5
915-920
EN
The paper contains experimental results of three-frequency parametric conversion in the field of femtosecond laser pulses in periodically poled lithium niobate crystal. The spectral distribution and the power of radiation at the periotically poled lithium niobate output pumped by Ti:sapphire laser were measured. Special attention is paid to realization of parametric amplification at low frequency pumping. In order to interpret the results obtained we used simultaneous phase matching condition of two coupled three-frequency processes.
3
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In situ Investigation of OH^{-} Absorption in LiNbO_{3} and LiNbO_{3}:MgO Crystals during Reducing/Oxidizing Annealing

100%
Sugak Y., Sugak D., Zhydachevskii Y., Solskii I., Buryy O., Ubizskii S., Becker K.
Acta Physica Polonica A
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2010
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vol. 117
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issue 1
170-173
EN
The work presents experimental results of an in situ investigation of the OH^{-} absorption in pure and MgO-doped LiNbO_{3} crystals during reducing (95% Ar + 5% H_{2}) and oxidizing (O_{2}) high-temperature treatments in the temperature range from room temperature to 820 K. The absorption spectra measured in situ at high temperatures in reducing/oxidizing atmospheres have been analyzed. The origin of the changes in optical absorption caused by heating of the crystal is discussed in terms of the OH-bonds orientation change.
4
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Crystal Structure of the High Temperature Phase of Strontium Barium Niobate

100%
Paszkowski R., Zubko M., Wokulska K., Kusz J., Dec J.
Acta Physica Polonica A
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2016
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vol. 130
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issue 4
856-858
EN
Pure and undoped strontium-barium niobate Sr_{0.40}Ba_{0.60}Nb₂O₆ (SBN40) single crystals grown by the Czochralski method were investigated by single crystal X-ray diffraction methods. The study below T_{C} (429 K for SBN40) confirmed the structure with P4bm space group. Above this temperature the structure transforms into the paraelectric, centrosymmetric one with P4/mbm space group. Analysis of the recorded diffraction patterns allowed to observe several signs of crystal structure modulation. On the registered diffraction images satellite reflections were found. A modulation vector q=(δ,±δ,), where δ=0.3075(6) (at room temperature) was found and it was similar to that occurring in the SBN61. In addition, above the phase transition temperature on the (hk) planes with l integer a weak diffuse scattering was observed.
5
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Third-Order Nonlinear Optical Properties and Reverse Saturable Absorption in 2,3-Butanedione Dihydrazone Using z-Scan Technique

100%
Singh V., Aghamkar P., Lal B.
Acta Physica Polonica A
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2013
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vol. 123
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issue 1
39-44
EN
Using chemical route a 2,3-butanedione dihydrazone (BDDH) compound was prepared. The third-order nonlinear optical properties of BDDH were investigated by using single beam z-scan technique with Q-switched, frequency doubled Nd:YAG laser (λ = 532 nm) at 5 ns pulse. Effect of excitation intensity on nonlinear optical properties has been studied and found that experimental and computed values are well in agreement. Also, we found the measured nonlinear optical coefficients are nearly ten times larger than the reported. The excited state absorption cross-section of BDDH was found to be larger than that of the ground state absorption cross-section, indicating the reverse saturable absorption.
6
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Development of Growth Technologies for the Photonic Single Crystals by the Czochralski Method at Institute for Single Crystals, NAS of Ukraine

100%
Kosmyna M., Nazarenko B., Puzikov V., Shekhovtsov A.
Acta Physica Polonica A
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2013
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vol. 124
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issue 2
305-313
EN
The present paper briefly overviews the application of the Czochralski method for growth of a set of oxide crystals for photonics, as well as the design of equipment at the Institute for Single Crystals, NAS of Ukraine. The examples of crystal growth and their characterization are described. The simultaneous Q-switched lasing and self-Raman frequency conversion were demonstrated in Nd-doped PbWO_4 and PbMoO_4 crystals grown by the Czochralski method. The slope lasing efficiency obtained for a PbMoO_4:Nd^{3+} laser is the best result for all the crystals with the scheelite-type structure. A detection unit with high scintillation characteristics based on a large volume (V ≈ 350 cm^3) CdWO_4 crystal was produced. Crystal growth procedures and properties of new double tungstate and vanadate crystals are presented, too.
7
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Highly Nonlinear Multi-Material Chalcogenide Spiral Photonic Crystal Fiber for Supercontinuum Generation

100%
Kalra S., Vyas S., Tiwari M., Buryy O., Singh G.
Acta Physica Polonica A
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2018
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vol. 133
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issue 4
1000-1002
EN
In this paper, we have numerically simulated a highly nonlinear multi-material chalcogenide photonic crystal fiber in order to investigate both the linear and the nonlinear parameters for generating a supercontinuum. The photonic crystal fiber is designed with borosilicate and As₂S₃ glass, where borosilicate is doped in a spiral shape in the cladding region of the fiber. The designed fiber was carefully anlaysed for the parameters, effective refractive index, effective mode area, dispersion and nonlinearity coefficient. The estimated parameters are found satisfactory and suitable for further simulation and investigation of the design for broadband supercontinuum generation.
8
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Optical Properties of LiNbO₃-Ag Nanocomposites

100%
Bolesta I., Vakiv M., Haiduchok V., Kushnir O., Demchuk A., Nastyshyn S., Gamernyk R.
Acta Physica Polonica A
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2018
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vol. 133
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issue 4
860-863
EN
The article presents the experimental results of the investigation of the absorption spectra and nonlinear refraction of the metal-dielectric nanocomposite that contains the lithium niobate pyroelectric crystal coated with the silver nanofilms on its surface. The atomic force microscopy surface research of these crystals with and without films are also provided. The nanowidth silver films impact on optical spectra and nonlinear refraction of LiNbO₃-Ag nanocomposite was analyzed depending on the sign of the side charge of the crystal, that contain nanofilms.
9
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Growth and Optical Properties of Li_2B_4O_7 Single Crystals Pure and Doped with Yb, Co and Mn Ions for Nonlinear Applications

100%
Podgórska D., Kaczmarek S., Drozdowski W., Berkowski M., Worsztynowicz A.
Acta Physica Polonica A
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2005
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vol. 107
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issue 3
507-518
EN
The paper reports on the growth conditions of Li_2B_4O_7 single crystals in both pure and Yb, Co, Mn doped systems. The crystals were grown by the Czochralski method using an intentional concentration of the above-mentioned ions at a level of 0.5 mol.%. The pure and Mn-doped crystals were found to be highly transparent and clear. The crystals doped with Yb_2O_3 had a lot of precipitations making them opaque. The Co-doped crystals were purple-blue in colour and highly transparent. The growth of Yb and Co doped Li_2B_4O_7 crystals was reported for the first time in this paper. Absorption was measured in the range of 200 to 3200 nm, moreover analysis of changes in the absorption spectrum ofγ-irradiated pure and doped Li_2B_4O_7 crystals was performed. Some thermoluminescence properties were measured, e.g. energies and lifetimes of the traps of different charge carriers occurring in the crystals at low temperatures.
10
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Second Harmonic Generation in AlGaAs Nanowaveguides

88%
Rutkowska K., Duchesne D., Volatier M., Arès R., Aimez V., Morandotti R.
Acta Physica Polonica A
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2011
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vol. 120
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issue 4
725-731
EN
In this paper, we investigate semiconductor nanowaveguides (i.e. ridge waveguides with core-widths narrower than 1 μm) intended to act as novel optical light sources through nonlinear wavelength/frequency conversion. In particular, numerical calculations have been performed in order to design suitable photonic devices (fabricated in the AlGaAs/GaAs platform) capable of high efficiency second harmonic generation. Particular interest has been dedicated to the effective conversion of optical signals from 1520-1600 nm (the third telecom window) down to 760-800 nm. We demonstrate that the output wavelength (resulting from modal phase-matching) can be dynamically tuned by proper adjustment of the temperature and/or geometrical parameters of the waveguides. In addition, by changing the waveguide width it is also possible to modify the device dispersion characteristics, giving the possibility to work in the region of anomalous dispersion and thus allowing for the generation of temporal solitons.
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