KnE Energy https://knepublishing.com/index.php/KnE-Energy <p><strong><a href="https://knepublishing.com/index.php/index/about/contentAlert" target="_blank" rel="noopener">Click here</a> to register for new content alerts.</strong></p> <p>ISSN:&nbsp;<span lang="EN-GB">2413-5453</span></p> KnE Publishing en-US KnE Energy 2413-5453 Table of Contents https://knepublishing.com/index.php/KnE-Energy/article/view/2459 <p>.</p> . . Copyright (c) 2018 KnE Energy & Physics Large-scale Synthesis of Monodisperse PbS Quantum Dots https://knepublishing.com/index.php/KnE-Energy/article/view/2007 <p class="p1">&nbsp;PbS quantum dots (QDs) are a promising material for designing of modern solar energy convertors. Yet, their reproducible synthesis is still intractable, since typical methods do not allow controlling the growth of PbS nanocrystals due to the high reaction rates. Here we propose the two-step synthetic procedure, which allows controlling precisely nanocrystal growth on the second stage. The first step allows obtaining small PbS QDs by the standard hot injection method, which are then slowly grown to a desired size on the second stage. By use of this method, we were able to obtain gram-scale batches of PbS QDs with high reproducibility of the photoluminescence properties of the synthesis product.</p> <p class="p1"><span class="s1">Keywords: </span>PbS quantum dots, nanoparticles growth, infrared luminescence</p> K Vokhmintcev P Linkov P Samokhvalov K Takai A Baranov A Fedorov I Nabiev Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 1–6 1–6 10.18502/ken.v3i3.2007 Polymeric Layers for Optical Structures with Controllable Waveguide Parameters https://knepublishing.com/index.php/KnE-Energy/article/view/2008 <p class="p1">Anisotropic planar waveguides based on a liquid crystal monomer with principal refractive indices n<span class="s1"> U V Mahilny A I Stankevich Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 7–13 7–13 10.18502/ken.v3i3.2008 Periodic Structures Fabricated By STED-DLW Stereolithography: Morphology and Optical Properties https://knepublishing.com/index.php/KnE-Energy/article/view/2009 <p class="p1">Two-dimensional (photonic antennas) and three-dimensional (photonic crystals) periodic polymer structures were fabricated by STED-DLW stereolithography. Their morphological features were studied using scanning electron microscopy and atomic force microscopy; also their optical properties were investigated by Fourier spectroscopy and confocal microscopy.</p> <p class="p1"><span class="s1">Keywords: </span>STED-DLW stereolithography, optical properties, luminescent mapping, 3D structures</p> D A Kolymagin R D Zvagelsky D A Chubich A G Vitukhnovsky Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 14–22 14–22 10.18502/ken.v3i3.2009 Laser Printing of Gel Microdrops with Living Cells and Microorganisms https://knepublishing.com/index.php/KnE-Energy/article/view/2010 <p class="p1">We report the results of experiments on laser printing (wavelength λ=1064 nm) with gel microdrops acting as carriers of living microbial and cellular objects. The dynamics of transport processes with the help of high-speed optical video was studied, which allows to determine characteristics of the formed gel jets and to optimize the operating mode of the laser. It is shown that laser pulses of 4 to 20 ns duration and energy E ≤ 20 μJ should be used to minimize the negative effect on living systems. The results can be used to optimize the technologies of cellular printing and laser engineering of microbial systems (LEMS). LEMS technology is used to isolate hard-cultivated and non-cultivated by classical methods of microorganisms that can act as producers of new biologically active substances and antibiotics.</p> <p class="p1"><span class="s1">Keywords: </span>laser printing, gel, microdrop, living cell, microbial</p> N V Minaev V I Yusupov V S Zhigarkov E S Churbanova V S Cheptsov M V Gorlenko V N Bagratashvili Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 23–31 23–31 10.18502/ken.v3i3.2010 Equivalent Surface Temperature of Optical Elements Interacting with Laser Irradiation https://knepublishing.com/index.php/KnE-Energy/article/view/2011 <p class="p1">We propose a novel technique for measuring the surface temperature distribution of optical elements interacting with high power laser radiation. This technique is based on measuring temperature sensitive piezoelectric resonance frequencies of nonlinearoptical crystals that are transparent at involved laser radiation wavelengthes. Using small thermoresonators made of the lithium niobate (LiNbO<span class="s1">3</span>) crystal the kinetics of the surface temperature distribution of the silica lens heated by 11W CW laser radiation at 1064 nm was measured. According to measured data, the optical absorption coefficient of the lens was evaluated to be N V Kovalenko G A Aloian A V Konyashkin O A Ruabushkin Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 32–37 32–37 10.18502/ken.v3i3.2011 Methods of Interaction Field Extension for Precision Highspeed Femtosecond Laser Processing of Transparent Materials https://knepublishing.com/index.php/KnE-Energy/article/view/2012 <p class="p1">The results of experiments on the study of methods of the focal volume elongation in the direction of the propagation of femtosecond laser pulses are given. The lengthening of the focal volume due to linear effects - interface spherical aberration, beam self-diffraction, and nonlinear effects - Kerr self-focusing is demonstrated. The conditions and reasons for the formation of extended filamentary micromodifications with diameters about 2 μm and a length of more than 100 μm in polycarbonate samples using different methods of extending the interaction region are determined.</p> <p class="p1"><span class="s1">Keywords: </span>femtosecond laser, microstructures, microprocessing, photodegradation, filamentation.</p> D Ganin K Lapshin S Vartapetov Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 38–46 38–46 10.18502/ken.v3i3.2012 The Design Optimization and Experimental Investigation of the 4.4 μm Raman Laser Basedon Hydrogen-filled Revolver Silica Fiber https://knepublishing.com/index.php/KnE-Energy/article/view/2013 <p class="p1">Optical properties of hollow-core revolver fibers are numerically investigated depending on various parameters: the hollow-core diameter, the capillary wall thickness, the values of the minimum gap between the capillaries, the number of capillaries in the cladding and the type of glass (silica and chalcogenide). Preliminary, similar calculations are made for simple models of hollow-core fibers. Based on the obtained results, the optimal design of the revolver fiber for Raman laser frequency conversion (1.56 μm → 4.4 μm in <span class="s1">1</span>H<span class="s1">2</span>) was determined. As a result, efficient ns-pulsed 4.42 μm Raman laser based on <span class="s1">1</span>H<span class="s1">2</span>-filled revolver silica fiber is realized. Quantum efficiency as high as 36 % is achieved and output average power as high as 250 mW is demonstrated.</p> A N Kolyadin M S Astapovich A V Gladyshev A F Kosolapov A D Pryamikov K G Alagashev M M Khudyakov M E Likhachev I A Bufetov Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 47–64 47–64 10.18502/ken.v3i3.2013 Plasma-mediated Nanosecond-Laser Generation of Si Nanoparticles in Water https://knepublishing.com/index.php/KnE-Energy/article/view/2014 <p class="p1">Plasma-mediated nanosecond IR-laser ablation of Si in water was describe sublinear function mass loss by multi shot ablative and third-power function extinction coefficient of generated colloidal solutions of density laser intensity. The first addiction shows influence subcritical ablative plasma to ablative rate, also fast increase extinction coefficient of 100 nm size particles of silicon in colloidal solution implies plasma-mediated dissociation of the ablation products.</p> <p class="p1"><span class="s1">Keywords: </span>silicon nanoparticles, nanosecond laser ablation, sub-critical ablative plasma, extinction coefficient, scaling relationships, melt expulsion</p> A Ivanova A Ionin S Kudryashov I Saraeva Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 65–72 65–72 10.18502/ken.v3i3.2014 Optical Properties of Gel Titanium Dioxide Film, Modified By Metal Nanoparticles https://knepublishing.com/index.php/KnE-Energy/article/view/2015 <p class="p1">The physic-chemical and optical properties of composite titanium dioxide films with gold, cobalt, copper, nickel and iron nanoparticles made using gel technology were studied in the work. The of titanium dioxide films structure synthesized according to different technologies is compared. The differential scanning calorimetry method was used to determine the temperatures of phase transitions of manufactured samples of various modifications of titanium dioxide. The transmission spectra of samples modified by metal nanoparticles with different concentrations were studied.</p> <p class="p2"><span class="s1">Keywords: </span>sol-gel, gel method, titanium dioxide, modification, nanoparticles, gold, cobalt, copper, iron, nickel, spectroscopy.</p> S A Aliev N E Nikolaev N S Trofimov M S Kopyeva T K Chekhlova Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 73–82 73–82 10.18502/ken.v3i3.2015 Superconducting Single-photon Detectors Made of Ultra-thin VN Films https://knepublishing.com/index.php/KnE-Energy/article/view/2016 <p class="p1">We optimized technology of thin VN films deposition in order to study VN-based superconducting single-photon detectors. Investigation of the main VN film parameters showed that this material has lower resistivity compared to commonly used NbN. Fabricated from obtained films devices showed 100% intrinsic detection efficiency at 900 nm, at the temperature of 1.7 K starting with the bias current of 0.7·I<span class="s1"> P Zolotov A Divochiy Y Vakhtomin V Seleznev P Morozov K Smirnov Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 83–89 83–89 10.18502/ken.v3i3.2016 Preparation of Freestanding Porous Silicon Photonic Crystals https://knepublishing.com/index.php/KnE-Energy/article/view/2017 <p class="p1">Nowadays, the photonic crystals are of great interest and are widely used in photonics, biosensing, optoelectronics and other fields of research. The one-dimensional photonic crystals manufactured on the basis of porous silicon were proved to be the most suitable for applications due to their high sorption ability, large surface area, easiness of fabrication, and possibility to precisely control porosity and refractive index during electrochemical etching. However, the sensitivity of various kinds of gas and biological sensors as well as the performance of solar cells and other devices on the basis of porous silicon structures may be significantly increased by detaching the structures from the substrate. Here, we have developed and investigated the fabrication procedure of freestanding one-dimensional photonic crystals on the basis of porous silicon with the use of electropolishing method followed stabilization of freestanding porous silicon photonic structures through their oxidation. We have demonstrated that the developed and applied lift-off procedure does not violate the morphology and the photonic properties of the samples.</p> <p class="p1"><span class="s1">Keywords: </span>Porous silicon, photonic crystals, microcavity, thin films, freestanding photonic crystals.</p> I Kryukova D Dovzhenko A Chistyakov I Nabiev Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 90–95 90–95 10.18502/ken.v3i3.2017 Dynamics of Changes in Optical Absorption Induced By Nanosecond Laser Pulses in the Bi12Tio20:Al Crystal https://knepublishing.com/index.php/KnE-Energy/article/view/2018 <p class="p1">The dynamics of the changes in optical absorption in Bi<span class="s1">12</span>TiO<span class="s1">20</span>:Al crystal at the wavelength of 655 nm, which were induced by a packet of laser pulses with the wavelength of 526.5 nm, pulse width of 10 ns, repetition frequency from 10 Hz to 1 kHz and pulse energy of 9-15 μJ had been experimentally investigated.</p> <p class="p1"><span class="s2">Keywords: </span>light-induced absorption, bismuth titanium oxide crystal, impulse radiation</p> V G Dyu D V Sokolov T D Tokhmashev S M Shandarov Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 96–102 96–102 10.18502/ken.v3i3.2018 Correction of Y-Branches on Proton-exchanged Waveguides in Lithium Niobate By Femtosecond Writing Technology https://knepublishing.com/index.php/KnE-Energy/article/view/2019 <p class="p1">Correction Y-branches power dividers of the multi-function integrated optics chips on proton-exchanged waveguides in lithium niobate by the technology of direct femtosecond laser writing were investigated. Optimal correction parameters and their influence on temperature stability of Y-splitter are determined.</p> <p class="p1"><span class="s1">Keywords: </span>lithium niobate, Y-splitters, proton exchange, femtosecond writing, refractive index, integrated optics.</p> N N Skryabin M A Bukharin S M Kostritskii Yu N Korkishko V A Fedorov D V Khudyakov Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 103–108 103–108 10.18502/ken.v3i3.2019 Photoelectric Fields and Band Gap in Doped Lithium Niobate Crystals https://knepublishing.com/index.php/KnE-Energy/article/view/2020 <p class="p1">Photorefractive effect was researched and band gap was determined in nominally pure congruent and stoichiometric lithium niobate crystals, and in a series of congruent LiNbO<span class="s1">3 </span>crystals doped by Mg, Zn, B, Gd, Y, Er cations, and LiNbO<span class="s1">3 </span>single crystals with double doping Mg:Gd, Mg:Fe, Mg:Y, Mg:Ta by photoinduced light scattering and optical spectroscopy methods.</p> <p class="p1"><span class="s2">Keywords: </span>lithium niobate single crystal, doping, photorefractive effect, photoinduced light scattering, optical spectroscopy, band gap</p> N V Sidorov M N Palatnikov N A Teplyakova D V Manukovskaya A V Syuy E O Kile D S Shtarev Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 109–115 109–115 10.18502/ken.v3i3.2020 Nanogratings Formation in a System of Ultra-short Laser Pulses – Metalloorganic Gas – Deposited Metal – Sapphire in Sinergetic Interference Field with Waveguide Modes Participation https://knepublishing.com/index.php/KnE-Energy/article/view/2021 <p class="p1">Experimental results of laser-induced deposition of structured metal films from metalloorganic vapor have been analyzed. A new physical model has been put forward to explain the results. The model is based on the interference phenomena between the incident laser radiation and waveguide modes of a thermally induced gradient waveguide in the substrate.</p> <p class="p1"><span class="s1">Keywords: </span>femtosecond radiation, metal deposition, interference, waveguide modes, surface nanogratings.</p> V S Makin R S Makin Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 116–121 116–121 10.18502/ken.v3i3.2021 Conditions for the Dye Sensitization of Photoprocesses in Semiconductors https://knepublishing.com/index.php/KnE-Energy/article/view/2022 <p class="p1">The necessary requirements for the photoeffect sensitization are the existence of electron states in the semiconductors capable of accepting energy from the dye and subsurface band bending. Methods for control of the sensitization efficiency are discussed.</p> <p class="p1"><span class="s1">Keywords: </span>Internal Photo Effect, Semiconductors, Dye Sensitization.</p> M A Goryaev Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 122–129 122–129 10.18502/ken.v3i3.2022 Experimental Research of XeBr Excimer Molecule Luminescence in Ar-Xe- C2HBrClF3 Gas Mixture with High Energy Particles Excitation https://knepublishing.com/index.php/KnE-Energy/article/view/2023 <p class="p1">The results of experimental research of spectral and time-resolved properties of XeBr excimer molecule luminescence in high-pressure gas mixtures of Ar-Xe-C<span class="s1">2</span>HBrClF<span class="s1">3 </span>under fast electron (E<span class="s1"> A V Podkopaev A I Mis'kevich Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 130–137 130–137 10.18502/ken.v3i3.2023 Organic Chromophores with Nonlinear Optical Properties for Electro-optical Modulators https://knepublishing.com/index.php/KnE-Energy/article/view/2024 . K S Levchenko K A Chudov N O Poroshin E V Zinoviev P A Chicheva E A Shohina P S Shmelin E P Grebennikov Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 138–146 138–146 10.18502/ken.v3i3.2024 Terahertz Radiation of a Low-inductance Discharge in Vacuum with Laser-plasma Initiation https://knepublishing.com/index.php/KnE-Energy/article/view/2025 <p class="p1">The results of the study of terahertz radiation, which is generated by the plasma of a low-inductance discharge with micropinchs, are presented in this paper. The discharge was initiated by focused radiation from a pulsed Nd:YAG laser (pulse duration is 10 ns, pulse energy is 0.8 J). The energy that was stored in the capacitor of the discharge system was ∼ 40 J. The principal role of micropinch for the generation of THz radiation was proposed. The oscillogram of the diode current was obtained to visualize the presence of micropinch plasma. The power of the THz source was calculated and an experimental study of the spectrum of this source was carried out.</p> K I Kozlovskii M I Lisovsky A P Melekhov A A Plekhanov A A Chistyakov Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 147–153 147–153 10.18502/ken.v3i3.2025 Taking into Account the Increase in the Dye Molecules Absorptivity in Modeling of Graetzel Solar Cell with Metallic Nanoparticles https://knepublishing.com/index.php/KnE-Energy/article/view/2026 <p class="p1">Using a model developed by Professor Kucherenko M.G. a mathematical description of the effect of metal nanoparticles on the absorbing capacity of organic dye molecules in Graetzel cells was carried out. The enhanced absorption spectra of the dyenanoparticle system and the current-voltage characteristics of the investigated solar cells are calculated.</p> D A Kislov Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 154–164 154–164 10.18502/ken.v3i3.2026 Dynamics of Switching Waves in a Nanofluid in a Light Field https://knepublishing.com/index.php/KnE-Energy/article/view/2027 <p class="p1">The dynamics of the concentration of nanofluids placed in a light field with a Gaussian intensity profile is studied theoretically. The investigation is based on the analytical and numerical solutions of the system of linearized heat conduction and convectiondiffusion equations. The convection-diffusion equation contains terms that correspond both to the Soret effect and to the transfer of nanoparticles, caused by the action of a light field on them (electrostriction). The dependence of the coefficient of thermal conductivity of the medium on the concentration is taken into account. It is shown that under these conditions single travelling waves appear in the medium, the velocity of which depends not only on the thermal physical parameters of the medium, but also on the polarization of the particles. Conditions under which the stratification of the medium is possible are found.</p> A Livashvili V Krishtop G Kostina P Vinogradova N Kireeva Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 165–172 165–172 10.18502/ken.v3i3.2027 Calculation of Field Characteristics in Periodic Nanostructures from Composite Elements with Activated Plasmon Modes https://knepublishing.com/index.php/KnE-Energy/article/view/2028 <p class="p1">Modeling of the electromagnetic field of the optical frequency in periodic structures composed of parallel conducting nanorods as well as composite spherical nanoparticles with an excitonogenic envelope in hexagonal 2d-lattices - in the quasistatic approximation and the FDTD method. The qualitative agreement of these approaches is shown when calculating field characteristics in lattices of cylindrical elements.</p> M G Kucherenko A P Rusinov D A Kislov Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 173–189 173–189 10.18502/ken.v3i3.2028 Formation of Surface Plasmon-Polariton Vortices at Reflection from Curvilinear Boundary https://knepublishing.com/index.php/KnE-Energy/article/view/2029 <p class="p1">We present the results of simulation of interference of surface plasmon-polaritons (SPPs) which are falling and reflecting from the curvilinear boundary of inhomogeneity area in the metal layer. The plasmon vortices with a screw phase dislocation appear in the singular points of the field as a result of the SPP interference after reflection from the boundary of inhomogeneity in the dovetail form. The position of the plasmon vortices on the surface of metal layer can be controlled by means of the external electrostatic field. Negative charges localized at the control probes cause the change of the boundary curvature of the permittivity of inhomogeneity area on the metal layer, which leads to displacement of the vortex localization points. When the vortex is localized under the readout nanowire probe with angular thread, the maximum or minimum of the signal takes place in the probe depending on the helicity of the thread and the topological charge of the vortex.</p> <p class="p1"><span class="s1">Keywords: </span>surface plasmon-polariton, plasmon vortex, nanowire.</p> V S Pereskokov I V Dzedolik Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 190–203 190–203 10.18502/ken.v3i3.2029 The Features of Surface Plasmon-Polariton Pulses Generation Via Cooperative Effects in Waveguide Spaser https://knepublishing.com/index.php/KnE-Energy/article/view/2030 <p class="p1">The problem of sub-picosecond plasmon-polariton pulse formation in metal/dielectric interface due to collective decay of excited quantum dots, placed in the dielectric layer near the metal surface, is considered. Theoretical approach to selection of semiconductor quantum dots and dielectric host medium to increase the energy transmission of quantum dot collective excitations into surface plasmon-polariton modes of waveguide spaser is developed.</p> M Yu Gubin A V Shesterikov M G Gladush A V Prokhorov Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 204–214 204–214 10.18502/ken.v3i3.2030 Polariton Propagation in Imperfect Resonantly Absorbing Bragg grating https://knepublishing.com/index.php/KnE-Energy/article/view/2031 <p class="p1">The nonlinear polariton transmission through resonantly absorbing Bragg grating (RABG) with randomly varying lattice spacing is studied. In this work are presented the results of numerical simulation of propagation stability of polaritonic solitary wave consisting of matter wave coupled with counter propagating light waves which propagate through dielectric medium, containing periodically placed in the dielectric waveguide thin dielectric films with metallic nanoparticles (or quantum dots, nanoagregates with nonlinear dielectric properties). The influence of lattice spacing deviations from mean value (average) of the lattice spacing is described in the model equations by random multiplicative noise set in the phases of forward and backward electric components of electromagnetic wave. As the initial condition it was used the solitary wave solution of the model describing nonlinear wave propagation in perfect nonlinear RABG. The results of numerical simulations show that phase fluctuations lead to periodic oscillations (with the period 2 E V Kazantseva Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 215–227 215–227 10.18502/ken.v3i3.2031 Raman Nonlinearity Contribution to Spatio-Temporal Pulse Dynamics Under Filamentation in Yag Crystal https://knepublishing.com/index.php/KnE-Energy/article/view/2032 <p class="p1">We report on numerical study of the nonlinear pulse propagation under filamentation of femtosecond near-infrared radiation under normal dispersion regime in YAG crystal. Influence of the Raman and Kerr tandem action on a spatial and temporal dynamics of the laser pulse were discussed. We have shown that Raman nonlinearity provides an asymmetry of temporal pulse profile: the leading edge becomes more bright and propagates at larger distances in comparison with trailing edge.</p> <p class="p1"><span class="s1">Keywords: </span>filamentation, supercontinuum generation, Raman nonlinearity.</p> K V Lvov S Y Stremoukhov F V Potemkin Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 228–234 228–234 10.18502/ken.v3i3.2032 Field Distribution into Binary Linear Waveguide Array https://knepublishing.com/index.php/KnE-Energy/article/view/2033 <p class="p1">The binary (two-component) linear waveguide array that is formed either from identical waveguides but with alternating distances between adjacent waveguides, or waveguides with a positive refractive index, but having distinctions in the refractive index or the waveguide thickness. The exact solution of the coupled wave equations describing the field distribution over waveguides is found. These solutions describe the discrete diffraction in the model under consideration.</p> <p class="p1"><span class="s1">Keywords: </span>coupled waveguides, binary array, discrete diffraction, generation function method.</p> A I Maimistov A A Dovgiy Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 235–240 235–240 10.18502/ken.v3i3.2033 Spin-orbital Conversion of Bessel Light Beams By Liquid Crystal Elements https://knepublishing.com/index.php/KnE-Energy/article/view/2034 <p class="p1">For the first time, the spin-orbital conversion of the linearly polarized Bessel beams in the process of their propagation in the electrically-controlled liquid crystal cell has been realized experimentally. Variations in the polarization, phase, and spatial structure of the beam have been analyzed. It has been shown that, when a Bessel beam is propagating along the liquid crystal director, the generated beam is orthogonally polarized, whereas the topological charge is varied by two unities.</p> <p class="p1"><span class="s1">Keywords: </span>Bessel light beams, spin-orbital conversion; liquid crystals</p> S A Nazarov D V Gorbach E A Melnikova S N Kurilkina A L Tolstik Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 241–248 241–248 10.18502/ken.v3i3.2034 Resonance Absorption of Light By Subwavelength Diffractive Gratings https://knepublishing.com/index.php/KnE-Energy/article/view/2035 <p class="p1">Diffraction of light of a visible spectral range by subwavelength metal gratings is investigated theoretically and experimentally. The influence of different grating parameters (filling factor, shape and depth, material, angle of incidence, wavelength and polarization of radiation) on diffraction efficiency is investigated. The conditions are found under which there are only zero diffraction order and the minus first order. It is established that the zero order can be suppressed by selecting the depth and shape of the grating relief. High diffraction efficiency in the -1st order is observed with increasing depth of the grating relief (more than 70% at a depth h = 80 nm). It is shown that under certain conditions an effect of plasmon resonance occurs, at which there is a complete absorption of the incident radiation. The considered optical elements can be used in systems for image processing, projection displays, in the development of a variety of sensors, etc.</p> <p class="p1"><span class="s1">Keywords: </span>subwavelength grating, diffraction efficiency, plasmon resonance</p> N I Petrov V A Danilov V V Popov B A Usievich Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 249–258 249–258 10.18502/ken.v3i3.2035 Forming of the Optical Beam with the Rotating Polarization Vector https://knepublishing.com/index.php/KnE-Energy/article/view/2036 <p class="p1">A method for the optical beam production with the rotating polarization vector based on the interference of two beams with the circular polarizations is proposed. The frequency shift between beams is implemented by means of acousto-optic (AO) diffraction. The method is used for the amplitude light modulation with the frequency nf where f is acoustic frequency and n is integer. AO modulators are fabricated from paratellurite crystal. Modulators allow modulating the optical radiation with wavelength of 0.63 mcm at the quadruple frequency of the acoustic wave. The modulation frequency achieves 180 MHz.</p> <p class="p1"><span class="s1">Keywords: </span>acousto-optic diffraction, Bragg regime, frequency shift, rotating polarization vector.</p> V M Kotov G N Shkerdin S V Averin Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 259–266 259–266 10.18502/ken.v3i3.2036 Manipulation of Microparticles By Bessel Light Beam https://knepublishing.com/index.php/KnE-Energy/article/view/2037 <p class="p1">We consider perspectives of optical manipulation of microscopic objects in the area of biology, biophysics and medicine. The first part of the work is devoted to a brief review of the microparticles’ manipulation. The second part contains calculations of the focusing of laser radiation parameters and some results on the formation of Bessel light beams. The experimental setup based on the optical manipulation technique of micron-sized particles was developed.</p> D U Tashtimirova E A Savchenko E T Aksenov V D Kuptsov Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 267–272 267–272 10.18502/ken.v3i3.2037 Vortex Interferometric Microscopy with Laguerre-Gaussian Beams https://knepublishing.com/index.php/KnE-Energy/article/view/2038 <p class="p1">In the present research, we discuss the results of analysis of coherent light beams carrying an optical vortex and propagating through the isotropic medium with a complex surface microrelief and its application to super resolution microscopy. It was shown, that phase analysis of singular beam with single charged centered optical vortex allow to retrieve information about sample surface relief. High spatial resolution caused by vortex helical phase sensitivity to disturbances in wave front after reflection or spreading through studying sample, which can be optically transparent or have a reflecting surface. This method applicable for non-destructive testing of live cells and biological tissues in real-time regime with exceeding optical diffraction limit. Vertical resolution of a microscope based on the phase singularity of Laguerre-Gaussian beams of low order can be achieved down to 5,27 nm for helium-neon laser source for optically transparent and reflecting surfaces.</p> <p class="p1"><span class="s1">Keywords: </span>optical vortex, phase, microscopy, singularity</p> B V Sokolenko S I Khalilov A V Prisyazhniuk D A Poletaev Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 273–280 273–280 10.18502/ken.v3i3.2038 Method of Laser Cross-correlation Optical Spectroscopy for Investigation of Dispersion Medium https://knepublishing.com/index.php/KnE-Energy/article/view/2039 <p>In the paper, we suggest one of the possible schemes of a cross-correlation optical spectroscopicdevice for investigation of turbid colloidal solutions and suspensions. This devise is designed fordeterminationof the hydrodynamic radii of nanoparticles. The cross-correlation function is constructed for two signals of light intensity scattered on a cuvette with the investigated dispersion medium. The construction of crosscorrelation optical spectroscopicdevice makes it possible to detect single scattered light by suppressing multiple scattering. We carried out an analysis of literature containing theory of light scattering and results of applying cross-correlation method for investigation of solutions and suspensions. Based on the analytical review, the scheme of cross-correlation optical spectroscopicdevice was developed and constructed.</p> <p class="p1"><span class="s1">Keywords: </span>specklefield, cross-correlation, optical spectroscopy, size distribution, dispersion medium</p> Z A Zabalueva E K Nepomnyashchaya E N Velichko E T Aksenov Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 281–286 281–286 10.18502/ken.v3i3.2039 Laser Desorption of Traces of Explosives in Ion Mobility Spectrometry https://knepublishing.com/index.php/KnE-Energy/article/view/2040 <p class="p1">The efficiency of a YAG:Nd<span class="s1">3+</span>laser (λ = 1064 nm) and a diode continuous laser (λ = 440 nm) to initiate laser desorption of traces of trinitrotoluene (TNT) and cyclotrimethylenetrinitramine (RDX) is quantitatively compared with use of mass spectrometry. It is shown that a pulsed neodymium laser is more promising for creating a device of contactless sampling for ion mobility spectrometers.</p> А Е Аkmalov G E Kotkovskii А А Chistyakov Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 287–296 287–296 10.18502/ken.v3i3.2040 Laser Conoscopy Study of Optical Anomalies in Uniaxial Crystals https://knepublishing.com/index.php/KnE-Energy/article/view/2041 <p class="p1">New experimental possibilities of detecting fine optical anomalies in uniaxial crystals are demonstrated on a level with numerical estimation of refractive index and mechanical stress variations that cause distortions of the optical indicatrix. New possibilities are due to the use of an exact equation for isochromes derived for uniaxial crystals without mathematical simplifications commonly used by other authors. It allows one to calculate and graphically reproduce the theoretical form of isochromes of any orders in the conoscopic picture of an ideal crystal with known principal refractive indices, the thickness and orientation of the crystal surfaces, and also the wavelength of the radiation and the parameters of the optical circuit. A computer comparison of the theoretical image with an experimental conoscopic picture of a real crystal, fixed by a color digital camera on a semitransparent screen, is performed. The data on the variations of refractive indices and mechanical stresses in the crystal are retrieved from the mathematical processing of differences in the conoscopic images. The applications of the proposed method for the analysis of optical homogeneity of paratellurite and lithium niobate single crystals are presented.</p> <p class="p1"><span class="s1">Keywords: </span>method of conoscopy, isochromes, piezo-optic effect</p> A Kolesnikov S Tretiakov I Kaplunov R Grechishkin E Vorontsova P Ivanova Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 297–303 297–303 10.18502/ken.v3i3.2041 Registration of CBS Effects from Wedge-shaped Samples Containing Particles of Alumina https://knepublishing.com/index.php/KnE-Energy/article/view/2042 <p class="p1">The paper looks at recent results of research dealing with a coherent backscattering (CBS) on the particles of alumina. It was developed a system of registration of CBS with a tunable dynamic sample. During the experiment the transport mean free path over the width of the peak of angular profile of signal intensity of CBS was determined. Moreover, new scientific data about the CBS’s profiles from randomly inhomogeneous environments were obtained.</p> S M Ismailov V G Kamenev Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 304–308 304–308 10.18502/ken.v3i3.2042 Scattered Light Measurement for the Birefringence Distribution Estimations https://knepublishing.com/index.php/KnE-Energy/article/view/2043 <p class="p1">The technique based on the digital processing of recorded scattered light distribution enabling for the measurement of the birefringence profile in non-uniform anisotropic materials was proposed.</p> <p class="p1"><span class="s1">Keywords: </span>measurement technique, birefringence distribution, scattered light, tempered glass</p> A N Vasilenko I U Primak A V Khomchenko Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 309–316 309–316 10.18502/ken.v3i3.2043 The Laser-only Single-event Effects Test Method for Spacecraft Electronics Based on Ultrashort-pulsed-laser Local Irradiation https://knepublishing.com/index.php/KnE-Energy/article/view/2044 <p class="p1">The substantive laser method for studying the radiation hardness of semiconductor devices, not requiring calibration by ions, called ”local irradiation”, is described. The essence of the local approach is in irradiating the sample sensitive volume with the ultrashort-pulsed laser beam at some distance from its focus plane, where the beam becomes rather wide and divergent. Assuming the single-photon absorption, the relationship between the laser pulse energy and the excess charge actually generated in irradiated sensitive volume is obtained by accurate measurement of the electrical response, that makes possible to take into account non-uniform optical losses and avoid additional calibration by ions. Some results, obtained using both the front-side and the backside local irradiation of devices, are presented. Comparison with results obtained by traditional methods using focused laser radiation with subsequent calibration by ions showed that laser-only measurements, based on described local irradiation, give the correct estimates of radiation hardness parameters.</p> <p class="p1"><span class="s1">Keywords: </span>Ultrashort laser pulse, single-event effect, local laser irradiation, semiconductor device, integrated circuit.</p> O Mavritskii A Chumakov A Egorov A Pechenkin D Savchenkov Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 317–326 317–326 10.18502/ken.v3i3.2044 Refraction of the Flat Optical Beam in a Transparent Heterogeneous Environments https://knepublishing.com/index.php/KnE-Energy/article/view/2045 <p class="p1">Presents a method of visualization and laser diagnostics of optically inhomogeneous media based on the phenomenon of refraction of the structured laser radiation (SLR). The described method of studies of the diffusion layer of the optical refractography method. Experimental setup for digital recording refractive pattern (refractograms). Shown for examples application of methods of the laser refractography thermal processes.</p> O A Evtikhieva S M Khaing B S Rinkevichyus Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 327–336 327–336 10.18502/ken.v3i3.2045 Investigation of the Characteristics of the Three-axis Ring Typed Angular Velocity Transducer Based on Optical Tunneling Effect https://knepublishing.com/index.php/KnE-Energy/article/view/2046 <p class="p1">The structure of a three-axis ring type angular velocity transducer based on the optical tunnel effect (OTE) is proposed. In this article considered the primary motion, which is excited by the electrostatic means and on the secondary displacements which provide the applied angular velocity information.</p> <p class="p1"><span class="s1">Keywords: </span>three-axis transducer, angular velocity, optical tunneling effect, ring resonator.</p> V I Busurin V V Korobkov P V Mulin Y N Win Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 337–342 337–342 10.18502/ken.v3i3.2046 Application of Laser Radiation for Fabrication of Micromechanical Actuator Based on Two-Way Shape Memory Effect https://knepublishing.com/index.php/KnE-Energy/article/view/2047 <p class="p1">The work deals with production and research of experimental samples of micromechanical actuator based on the rapidly quenched TiNiCu alloy, in which a two-way shape memory effect is formed as result of impact of the laser radiation. By the technique of focused ion beams an element with thickness of 5 microns, width of 7 microns and 100 microns in length was obtained, bending reversibly to 2.5 microns in the heating-cooling cycle.</p> <p class="p1"><span class="s1">Keywords: </span>shape-memory alloy, thin ribbon, two-way shape memory effect, laser treatment, micromechanical actuator</p> K A Borodako K A Dmitrieva A V Shelyakov A A Ivanov A A Timofeev Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 343–348 343–348 10.18502/ken.v3i3.2047 Optoelectronic Methods of IR-Photometry in Solving Thermal and Physical Problems https://knepublishing.com/index.php/KnE-Energy/article/view/2048 <p class="p1">Results of the application of optoelectronic IR-photometry methods for solving the actual thermophysical problems using high-speed photodiode temperature (pyrometric) sensors are presented. The latest achievements of the Ioffe Institute in the field of middle IR spectral range (3-6 μm) photodiode production technology are used in the sensor development. The above-mentioned middle-IR photodiode sensors are based on heterostructures from A3B5 solid solutions and they do not require forced cooling. New data on thermophysical processes taking place under the complex experimental conditions, including dynamically changing properties of the object, have been obtained. The new experimental results are based on high-speed non-contact measurements of the absolute temperature of objects directly in the exposure region of laser radiation and / or powerful electromagnetic fields. In the context of creating new experimental techniques for determining the thermophysical parameters of new promising materials the efficiency of middle- IR photodiode temperature sensors has been shown. In particular, a simple and effective measuring method for determining the heat transfer coefficient of solid objects and the pyroelectric coefficient of ferro- and pyroelectric materials is offered. The measuring method is based on laser thermowave techniques and direct noncontact measurements of the sample surface temperature under the pulsed / periodic laser action. The proposed experimental techniques make it possible to significantly improve the accuracy of measurements of thermophysical parameters of materials, and in particular, to eliminate a considerable spread of data on the parameters of the pyroelectric effect in ferroelectric materials.</p> <p class="p1"><span class="s1">Keywords: </span>Pyrometric sensors, mid-IR photodiodes, laser thermowave techniques, heat transfer coefficient, pyroelectric coefficient</p> S E Aleksandrov G A Gavrilov A A Kapralov B A Matveev K L Muratikov G Y Sotnikova Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 349–361 349–361 10.18502/ken.v3i3.2048 Piezoelectric Resonance Temperature Sensor for Active Fibers https://knepublishing.com/index.php/KnE-Energy/article/view/2049 <p class="p1">A novel method for temperature measurement of active fibers under conditions of</p> <p class="p1">lasing and radiation amplification is introduced. This method allows determination of the longitudinal temperature distribution of active fibers at different optical pump powers. A piezoelectric resonator made of the quartz crystal in the form of a hollow cylinder is used as a temperature sensor. Investigated segment of the active fiber is put thorough the hole of the resonator. Heating temperature of the resonator is determined by measuring a frequency shift of the piezoelectric resonance, which is preliminary calibrated under uniform heating conditions. In order to evaluate the heating temperature of the investigated fiber segment, the last one was substituted with a copper wire coated with polymer. A copper wire was heated by transmitting an electric current and its temperature was determined by measuring the resistance change. Numerical simulations revealed that the heating temperatures of the active and copper fibers differ by less than 9% at 11 W/m thermal load level. Heat transfer coefficient was evaluated using cooling kinetics and stationary state temperature of the ”copper” fiber. Heating temperature of the active fiber of the ytterbium fiber laser was measured at different pump levels (up to 150W).</p> <p class="p1"><span class="s1">Keywords: </span>optical fiber, active fiber heating, fiber laser, temperature sensor, piezoelectric resonance</p> D R Kharasov A V Konyashkin O A Ryabusshkin Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 362–372 362–372 10.18502/ken.v3i3.2049 Study of Gamma-ray Induced Attenuation of Fluorine-doped Single-mode Radiation Hard Optic Fiber https://knepublishing.com/index.php/KnE-Energy/article/view/2050 <p class="p1">The paper presents the measurements results of optic fiber’s radiation induced attenuation. The approach of optic fiber’s radiation test at negative temperatures is introduced. The results of an investigation of the decay of an optical signal during a pulsed electron.</p> <p class="p1"><span class="s1">Keywords: </span>radiation hardness, fiber-optic communication, radiation-induced attenuation</p> D S Ukolov M E Cherniak R K Mozhaev Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 373–378 373–378 10.18502/ken.v3i3.2050 A Determination of the Initial Level of the Brillouin Frequency Shift in Optical Fibers of Different Kinds https://knepublishing.com/index.php/KnE-Energy/article/view/2051 <p class="p1">A dependence of the hyper-acoustic wave velocity on characteristics of the optical fiber core is analyzed in this paper. The values of Brillouin frequency shifts for various types of optical fibers at room temperature and without longitudinal tensile force are presented. Having database of profiles of the Mandelstam – Brillouin backscattering spectrums for fibers of different kinds and manufacturers allow to classify the optical fibers in the optical cables and detect damaged sections of fiber optical communication line.</p> <p class="p1"><span class="s1">Keywords: </span>optical fiber, strain, Brillouin frequency shift, Brillouin reflectometry, hyper-acoustic wave.</p> I V Bogachkov Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 379–387 379–387 10.18502/ken.v3i3.2051 Use of 3×3 Coupler in the Fiber Optic Strainmeter Based on Mach-Zehnder Interferometer https://knepublishing.com/index.php/KnE-Energy/article/view/2052 <p class="p1">In this paper a strainmeter based on the fiber optic Mach-Zehnder interferometer with 3x3 coupler for a phase shift demodulation is presented. Laboratory experiments on registration of harmonic deformation with the use of strainmeter were carried out. The experiment demonstrates efficiency of the strainmeter.</p> <p class="p1"><span class="s1">Keywords: </span>strainmeter, interferometer, coupler</p> О T Kamenev Y S Petrov A A Podlesnykh Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 388–392 388–392 10.18502/ken.v3i3.2052 Research of Quantum Well Laser Diode’s and Heterostructural P-I-N Photodiode’s of Fiber-Optic Modules Radiation Hardness to Gamma-ray and Neutron Irradiation https://knepublishing.com/index.php/KnE-Energy/article/view/2053 <p class="p1">The paper presents the measurements results of optical and electrical parameters of quantum well laser diodes and heteroepitaxial photodiodes under gamma-ray and neutron irradiation. The testing results of transceiver modules gamma irradiation tolerance are introduced. The most vulnerable elements of module are highlighted.</p> <p class="p2"><span class="s1">Keywords: </span>laser diode, photodiode, radiation hardness, VCSEL, transceiver modules, fiber-optic communication</p> R K Mozhaev M E Cherniak Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 393–399 393–399 10.18502/ken.v3i3.2053 The application of the Raman Spectroscopy Method for Evaluating Implants from the Dura Mater https://knepublishing.com/index.php/KnE-Energy/article/view/2054 <p class="p1">The results of a comparative spectral evaluation of the component composition of the surfaces of implants from the dura mater manufactured using the Lioplast technology with the use of ultrasound and sterilization are presented. Based on the analysis, coefficients were introduced reflecting the change in the relative concentration of components that determine the quality of the implants. It is established that Raman spectroscopy can be used to assess the change in the composition of implants based on the dura mater during their manufacture.</p> <p class="p1"><span class="s1">Keywords: </span>Raman spectroscopy, coefficients, spectral features, implants, dura mater.</p> P E Timchenko E V Timchenko L T Volova O O Frolov N K Kiyko AY Kulabukhova Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 400–406 400–406 10.18502/ken.v3i3.2054 On the Difference in Action of the Laser Light with Wavelength Near 2mm on Biotissue in Gas and Water Media https://knepublishing.com/index.php/KnE-Energy/article/view/2055 <p class="p1">It is shown that unlike action in the air environment, section of the biotissue in the water environment (physiological solution) is performed by the steam-gas stream which is formed as a result of superintensive boiling in thin (about 0.1 mm) a liquid layer in which absorbed laser radiation. Coagulation of the biotissue, adjacent to a section, happens due to heat which is produced via vapor condensation.</p> <p class="p1"><span class="s1">Keywords: </span>laser radiation in urology, a laser enucleation of the BPH, laser removal of the bladder cancer.</p> A Z Vinarov A M Dymov N I Sorokin V P Minaev V Y Lekarev Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 407–418 407–418 10.18502/ken.v3i3.2055 Spectral Studies of Rat Bone Tissue in Modeling Osteoporosis and Effectiveness of Treatment By Hydroxyapatite https://knepublishing.com/index.php/KnE-Energy/article/view/2056 <p class="p1">Presents the result of experiments on the study of the model of osteoporosis in rats using Raman spectroscopy and the effectiveness of its treatment with hydroxyapatite. Were revealed spectral differences between groups of samples (control group, group with the model of osteoporosis and a group with the model of osteoporosis after treatment with hydroxyapatite). In addition, optical coefficients were introduced to evaluate the effectiveness of treatment.</p> <p class="p1"><span class="s1">Keywords: </span>Raman spectroscopy, optical coefficients, osteoporosis, hydroxyapatite, collagen matrix</p> E V Timchenko P E Timchenko E V Pisareva M Y Vlasov L T Volova A S Tyumchenkova Y V Fedorova Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 419–428 419–428 10.18502/ken.v3i3.2056 Determination of Diffusion Coefficient in Hydrogel https://knepublishing.com/index.php/KnE-Energy/article/view/2057 <p class="p1">Background Oriented Schlieren method was used to obtain diffusion coefficient of glucose in hydrogel in the experiment with radial symmetry.</p> <p class="p2"><span class="s1">Keywords: </span>background oriented schlieren, diffusion, hydrogel, holographic sensors, glucose.</p> T Mironova A Kraiski Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 429–436 429–436 10.18502/ken.v3i3.2057 Plasmonic Magnetooptic Structures for Visualization of Magnetic Information https://knepublishing.com/index.php/KnE-Energy/article/view/2058 <p class="p1">Optical head with magnetized garnet layer is used to detect presence of thin ferromagnetic layers such as printed text. Mathematical model of the system was created. Incident P-polarized light affected by garnet layer changes its polarization due to Faraday effect. We can detect presence or absence of magnetic information after studying changes in polarization of the reflected light.</p> <p class="p1"><span class="s1">Keywords: </span>Magnetoplasmonic, Faraday effect, magnetoplasmonic structure, Magneto-optic plasmon resonance.</p> S A Baryshev S B Odinokov A S Kuznetsov Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 437–449 437–449 10.18502/ken.v3i3.2058 Holographic Structure Transfer from Dichromated Gelatin Layers to a Polymethylmethacrylate Substrate https://knepublishing.com/index.php/KnE-Energy/article/view/2059 <p class="p1">It is shown that the formation of a holographic structure on the polymethylmethacrylate (PMMA) surface is based on the use of the destructive effect of short-wave UV radiation with a wavelength less than 270 nm through windows previously formed in a thin layer of dichromated gelatin (DCG) covering the substrate. The optimization of the PMMA surface treatment by isopropanol and methylisobutyl ketone (MIBK) developers was made, which allowed creating on the PMMA substrates relief-phase holographic gratings with the high diffraction efficiency (DE) of about 25% and maximum depth of the surface relief of the order of 1 μm.</p> <p class="p1"><span class="s1">Keywords: </span>holographic gratings, surface relief, UV radiation, dichromated gelatin, polymethylmethacrylate, methylisobutyl ketone (MIBK).</p> N M Ganzherli S N Gulyaev I A Maurer D R Khazvalieva Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 450–457 450–457 10.18502/ken.v3i3.2059 Analysis of Temperature Modes of Hologram Recording on Photothermoplastic Materials https://knepublishing.com/index.php/KnE-Energy/article/view/2060 <p class="p1">Theoretical study of the process of hologram recording on photothermoplastic media</p> <p class="p1">in which a linear relationship between the change in the refractive index and the</p> <p class="p1">temperature expansion of the medium is assumed. The results of the study allow us</p> <p class="p1">to estimate the required laser radiation power for the information recording as the</p> <p class="p1">function of the spatial frequency and the radiation exposure duration.</p> <p class="p1">A solution was found for the heat conduction equation for photothermoplastic</p> <p class="p1">materials heated by an interference laser field. The solution obtained allows us</p> <p class="p1">to determine the required value of the recording temperature for given spatial</p> <p class="p1">frequencies, depending on the thermophysical parameters of the medium, and also</p> <p class="p1">on the power and duration of the heating radiation.The use of the results of the study made it possible to find analytical expressions for the dependence of the diffraction efficiency of thermal gratings on the spatial frequency, pulse duration, and thermophysical parameters of the medium. It is established that to increase the recording density in these media, materials with a low thermal diffusivity are necessary, while recording should be performed by the short pulses to minimize the length of thermal diffusion.</p> <p class="p1"><span class="s1">Keywords: </span>Diffraction efficiency; Hologram; Photothermoplastic materials; Temperature; Heating</p> N K Dzhamankyzov Y K Ismanov K M Zhumaliev S A Alymkulov Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 458–468 458–468 10.18502/ken.v3i3.2060 Phase Filters for 3D Localization of Point Light Sources https://knepublishing.com/index.php/KnE-Energy/article/view/2061 <p class="p1">The work relates to the engineering and research of phase filters for three-dimensional localization of point light emitters. These phase filters form a light field having two clearly visible maxima in their intensity distribution (i.e. two-lobe fields). By means of numerical simulation, the influence of the amplitude and phase distortions of the wave front of the illuminating beam on the two-lobe field formation has been studied in the work.</p> <p class="p1"><span class="s1">Keywords: </span>spiral light beams, amplitude distortions, phase distortions, threedimensional localization, two-lobe field.</p> V G Volostnikov E N Vorontsov N N Losevsky S P Kotova D V Prokopova S A Samagin Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 469–481 469–481 10.18502/ken.v3i3.2061 Study of Dimensional Stability of Metal-ceramic Prostheses By Holographic Interferometry https://knepublishing.com/index.php/KnE-Energy/article/view/2062 <p class="p1">Presents results of a study of deformation of metal-ceramic bridge prostheses manufactured in a variety of ways. Registration of deformations was carried out using double-exposure holographic interferometry. According to the experimental data, an optimal method of making dentures.</p> <p class="p1"><span class="s1">Keywords: </span>bridge prosthesis, deformation, holographic interferometry, the method of two exposures</p> A V Osintsev Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 482–489 482–489 10.18502/ken.v3i3.2062 Determination of the Working Liquids Technical Condition By Analysis of Digital Speckle Images Parameters https://knepublishing.com/index.php/KnE-Energy/article/view/2063 <p class="p1">The article discusses the practical realization for the optical control method of technical working fluids condition by the analysis of digital speckle images parameters is discussed. The experimental research results on the application of this method for estimation of aviation fuel and motor oil technical condition are presented.</p> <p class="p1"><span class="s1">Keywords: </span>motor oil, aviation fuel, speckle, autocorrelation, impurities, diagnostics</p> P V Pavlov A N Malov A V Neupokoeva Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 490–497 490–497 10.18502/ken.v3i3.2063 Method of Asymmetric Optical Encryption of Images Using Spatially Incoherent Illumination https://knepublishing.com/index.php/KnE-Energy/article/view/2064 <p class="p1">The method of asymmetric encryption of images based on the double optical encryption with spatially incoherent illumination is presented. Numerical simulations of the presented method in various modifications are carried out and their efficiency is estimated. The modification providing the best balance between maintaining the advantages peculiar to the optical encryption and quality of the decoded images is chosen. In this case the value of the normalized standard deviation (NSTD) of the decoded image from original one for asymmetric encryption differs no more than by 8% from NSTD of standard optical encryption with spatially incoherent illumination.</p> N N Evtikhiev V V Krasnov A V Shifrina Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 498–508 498–508 10.18502/ken.v3i3.2064 Objects Reconstruction By Compressive Sensing from Single-pixel Registrations Using DMD https://knepublishing.com/index.php/KnE-Energy/article/view/2065 <p class="p1">Compressive sensing allows to reconstruct information from a number of sparse signals. Use of digital micromirror device (DMD) between object and single-pixel detector planes is example of sparse signals registration technique. Detection of illumination from the objects by a single-pixel detector using a DMD was modeled. Grayscale, binary and color object images were used as objects. By compressed sensing images obtained under various recording conditions were reconstructed. Obtained results were analyzed. Reconstruction quality estimations and processing times are given.</p> <p class="p1"><span class="s1">Keywords: </span>compressed sensing, single-pixel imaging, digital micromirror device, image quality.</p> M N Kulakov R S Starikov P A Cheremkhin Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 509–522 509–522 10.18502/ken.v3i3.2065 Coefficients Quantization at Off-axis Digital Hologram Wavelet Compression https://knepublishing.com/index.php/KnE-Energy/article/view/2066 <p class="p1">Digital holographic information is compressed for storage of 2D- or 3D-objects amplitude and phase distributions, fast transmission, analyzing and displaying of these data. In this paper features of application of wavelet transforms for off-axis digital holograms compression are considered. The combined technique based on zero and twin orders elimination, wavelet compression of the amplitude and phase components of obtained Fourier spectrum and further additional compression of wavelet coefficients by thresholding and quantization is analyzed. Numerical experiments on reconstruction of images from the compressed holograms are performed. The comparative analysis of applicability of various wavelets and additional quantization of coefficients is performed. Obtained results demonstrate possibility of 180 and more times compression using iterative and noniterative methods of coefficients quantization and threshold zeroing less 80% of wavelet coefficients.</p> <p class="p1"><span class="s1">Keywords: </span>digital holography, hologram compression, wavelets, quantization, thresholding, digital image processing.</p> N N Evtikhiev E A Kurbatova P A Cheremkhin Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 523–534 523–534 10.18502/ken.v3i3.2066 Optical-electronic System and Software Complex for Research and Identification of Macro- and Micro-optical Elements of Security Holograms https://knepublishing.com/index.php/KnE-Energy/article/view/2067 <p class="p1">The paper presents an automated optical-electronic software and hardware complex for carrying out activities to identify and control the authenticity of diffraction and holographic optical security elements. The developed complex makes it possible to significantly simplify the work of the expert in conducting forensic studies of objects marked with security holograms.</p> S B Odinokov V D Cheburkanov V V Kolyuchkin N V Piryutin V E Talalayev I K Tsyganov Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 535–541 535–541 10.18502/ken.v3i3.2067 Zero Order Correction of Shift-multiplexed Computer Generated Fourier Holograms Recorded in Incoherent Projection Scheme https://knepublishing.com/index.php/KnE-Energy/article/view/2068 <p class="p1">Application of computer holography methods provides the possibility to obtain the high quality holograms of objects that exist as digital models without the necessity of complex and high precision optical schemes. Computer generated Fourier holograms (CGFH) are widely used for record and optical restoration of relatively simple 2D raster objects. Application of incoherent photolithography methods such as incoherent projection allows the record of CGFHs as micro-holograms onto the photosensitiv medium with desired reduction of hologram sizes using relatively simple optical setup. The reconstruction optical schemes of CGFHs can be implemented in augmented reality displays and optical sight indicators. In this article the specificity of CGFH shift-multiplexed record process and particularly the method of zero order correction is discussed.</p> <p class="p1"><span class="s1">Keywords: </span>computer generated hologram, Fourier hologram, incoherent projection scheme.</p> E Zlokazov P Cheremkhin V Krasnov Copyright (c) 2018 KnE Energy & Physics 2018-04-25 2018-04-25 542–548 542–548 10.18502/ken.v3i3.2068