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Opto - Electronics Review
EN The analysis of the tuned, liquid crystalline Fabry-Perot interferometer (FPTI) has been done by means of 4 x 4 matrix. Wide-ange incidence has been analysed in terms of Trollinger-Chipman correction for extraordinary wave. Results have been applied to determine constraints in design of the monochro[...]
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Optica Applicata
EN We report on the method of the chromatic dispersion determination of anisotropic refractive indices of homogeneously oriented layers of liquid crystals (LC). The experimental data have been obtained from transmission spectra of a plane parallel Fabry-Perot filter (FPF) filled with the liquid crystal[...]
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Opto - Electronics Review
EN The liquid crystal (LC) filters with hybrid, circular-planar, and circular-homeotropic alignments of the LC layer have been analysed in detail. The exploited alignment of the LC layer assures the uncommon polarizing properties of the filter. We manage to observe that transmissions in such a filter c[...]
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Biuletyn Wojskowej Akademii Technicznej
PL W artykule podjęto temat wyboru techniki fotoporządkowania ciekłego kryształu. Technologia ta jest alternatywą dla najczęściej stosowanego rubbingu, czyli jednostronnego polerowania warstw poliimidowych i poliamidowych. Zarówno w przypadku rubbingu (buffingu), który ma naturę kontaktową, jak i bezko[...]
EN In this study we consider the topic of the photoalignment of liquid crystal material. It is an alternative method to the rubbing of polyimide and polyamide layers. Both techniques provide the anisotropy in organic layers. This anisotropy aligns overlaying liquid crystal. The rubbing is a well known [...]
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Biuletyn Wojskowej Akademii Technicznej
PL Przedstawiony jest wpływ dyspersji optycznej współczynników załamania ciekłego kryształu oraz porządkującego warstwy poliimidu na charakterystyki widmowe filtra Fabry-Perot (FPF). Rozpatrywany jest filtr o specjalnej konstrukcji, wypełniony ciekłym kryształem. Pokazano sposób korekcji dyspersji ciek[...]
EN We report the effect of anisotropic refractive indices dispersion in liquid crystalline (LC) layer as well as in polyimide layer on Fabry-Perot Filter (FPF) spectrum. The experimental data have been obtained from transmission spectra of a plane parallel Fabry-Perot Filter (FPF) filled with liquid cr[...]
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Opto - Electronics Review
EN Liquid crystal devices as a medium for holograms storage have been investigated. Long term memory effects in LC cells have been observed. Experiments proved that certain combination of insulating alignment layers has a major influence on the long term memory effect. Optimal liquid crystal cell const[...]
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Journal of Achievements in Materials and Manufacturing Engineering
EN Purpose: The main aim of this work is to present our investigation in the field of photoalignment. In this work we introduce useful photoalignment techniques and discuss in detail the results of photocrosslinking and photodegradation in photosensitive polymer materials. Design/methodology/approach: [...]
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Biuletyn Wojskowej Akademii Technicznej
PL Opisano kilka różnych konstrukcji ciekłokrystalicznych modulatorów światła, wykorzystujących nematyczne i cholesteryczne ciekłe kryształy, a także kompozyty ciekłokrystaliczne typu PDLC. Podkreślono użyteczność podobnych konstrukcji do różnych zastosowań. Przedstawiono przykłady zastosowania tych [...]
EN Several different constructions of liquid crystal light modulators are described. This includes devices using nematic and cholesteric devices, moreover polymer-dispersed liquid crystals. The possibility of an application of similar devices for different purposes is underlined. Examples of an applica[...]
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Opto - Electronics Review
EN We investigate linear and nonlinear light propagation in a voltage-tunable array of waveguide channels in undoped nematic liquid crystals. This novel geometry, based on a photonic structure with a periodic modulation of refractive index controlled by an electric field, offers a wealth of possibiliti[...]
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Opto - Electronics Review
EN Photonic liquid crystal fibers have already been demonstrated as a promising perspective for creation of new classes of dynamically tunable optical fiber devices. By combining different geometries of photonic crystal fibers with a variety of different liquid crystals it is possible to obtain a new g[...]
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Opto - Electronics Review
EN Image analysis using polarizing methods allows removing the polarized light component from recorded images. This is known as polarization difference imaging (PDI). The use of liquid crystals (LC) in PDI was proposed in 2002. Modified LC unit with a properly oriented LC layer was proposed by the auth[...]
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Opto - Electronics Review
2017 Vol. 25, No. 4 290--295
EN In this work, an electrically tunable long-period fiber grating (LPFG) coated with liquid crystal layer (LC) is presented. As a LC layer, a prototype low-birefringence 1550A LC mixture was chosen. As a LPFG host, two types of gratings were studied: the LPFGs based on a standard telecommunication fib[...]
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Opto - Electronics Review
EN The paper reviews and discusses the latest developments in the field of the photonic liquid crystal fibers that have occurred for the last three years in view of new challenges for both fiber optics and liquid crystal photonics. In particular, we present the latest experimental results on electrical[...]
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Elektronika : konstrukcje, technologie, zastosowania
PL W pracy przedstawiono najnowsze wyniki badań nad ciekłokrystalicznymi światłowodami fotonicznymi pod wpływem zewnętrznych oddziaływań, takich jak temperatura, pole elektryczne i ciśnienie hydrostatyczne. Zaprezentowano również potencjalne możliwości zastosowania ciekłokrystalicznych światłowodów fot[...]
EN In this paper latest research activities on photonic liquid crystal fibers under the influence of external fields such as temperature, electric field and hydrostatic pressure were presented. Potential application possibilities of the photonic liquid crystal fibers to multi-parameter sensing are also[...]
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Opto - Electronics Review
EN The paper presents the latest experimental results on propagation properties of a photonic crystal fiber infilled with a nematic liquid crystal characterized by either extremely low (of the order of ~0.05) or relatively high (of the order of ~0.3) material birefringence. The nematic liquid crystal w[...]
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Optica Applicata
2012 Vol. 42, nr 1 167--180
EN High-birefringence nematic liquid crystals recently developed in the Military University of Technology (Poland) are examined for selected physical properties. In particular, for six liquid crystal mixtures there were determined: two components of dielectric permittivity for voltage frequencies in th[...]
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Opto - Electronics Review
EN A new method for quick and pretty accurate measurements of splay, twist and bend elastic constants of nematic liquid crystals is experimentally verified. The main concept relies on exploiting only the electric field and determining magnitudes of nematic elastic constants from threshold fields for Fr[...]
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Opto - Electronics Review
EN Liquid crystal cell (LCC) for space-borne laser rangefinder to space mission applications was developed, manufactured and tested under cooperation between Military University of Technology (MUT) in Poland and Vavilov State Optical Institute (Vavilov SOI) in Russia. LCC operates in twisted nematic mo[...]
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Opto - Electronics Review
EN There exists the problem in diagnostics of dense plasma (so-called Thomson diagnostics). For this purpose the plasma is illuminated by series of high energy laser pulses. The energy of each separate pulse is as large as 3 J, so it is impossible to generate a burst of such pulses by a single laser. I[...]
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Opto - Electronics Review
2016 Vol. 24, No. 4 169--182
EN There exists a need in a quality and accuracy of a three-dimensional laser metrology operating in numerically controlled automatic machines. For this purpose, one sends three laser beams mutually perpendicular. These three beams of the wavelength λ = 0.6328 μm are generated by the same laser and are[...]
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