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Article
Radiative properties of organic molecules in strong photon fields
We have experimentally investigated the dependence of the luminescence intensity of ethanol solutions of 2-(4-pyridyl)-5-phenyloxazole on the intensity of the exciting radiation from an XeCl laser (λex = 308 nm, ...
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Article
Specific Features of XeCl*-Laser Radiation Absorption by Concentrated Solutions of Organic Dyes
The transmission of focused laser radiation with power densities in the range (1–250) MW/cm2 through solutions of laser dyes (substituted paraterphenyls and rhodamine 6G) is investigated. The dependence of the tr...
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Article
Emission of Concentrated Solutions of Organic Compounds Excited with High-Power Laser Radiation
Specific features of emission of concentrated (C ≤ 1.2·1019 cm–3) solutions of organic molecules (rhodamine 6G, rhodamine C, phenalemine 512, and substituted paraterphenyl (LOC-1)) are investigated as functions o...
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Article
Broadband emission of dye mixtures in films and polymer matrices
Emission of mixtures of organic compounds in thin acrylic films and matrices is investigated from the blue to red range of the spectrum. The present paper is aimed at studying the feasibility of obtaining whit...
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Article
Investigation of Spectral-Luminescent and Lasing Properties of Bifluorophoric Molecules. I. Bifluorophores of Linear Structure
Eight bifluorophoric (BF) molecules on the basis of paratherphenyl, stilbene, phenyl, biphenyl (donors) and coumarin 120 and phenylphtalimide (acceptors) connected by the bridging -CH2- were experimentally studie...
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Article
Transient Absorption of Organic Molecules under High-Power Laser Excitation
In the present work, results of investigations into the transient absorption of some organic compounds by the method of pulsed flash photolysis are given. Experimental investigations were carried out using an ...
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Article
Spectral, luminescent, and lasing properties of pyran derivatives in thin acrylic films under optical excitation
Absorption and fluorescence spectra and lasing ability of pyran derivatives in thin polymeric layers (0.5–0.8 μm) based on polymethylmethacrylate and copolymerized methylmethacrylate and methacrylic acid are i...
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Article
Two-photon—induced fluorescence and electronic structure of substituted dicyanomethylene pyrans in solutions under femtosecond excitation
The method of two-quantum etalon is used to determine the two-photon absorption cross sections of eight dicyanomethylene (DCM) pyran dyes (DCM derivatives). Measurements of two-photon absorption of femtosecond Ti...
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Article
Technique of synthesis and optical properties of CdS/polymethylmethacrylate nanocomposites
The technique of synthesis of polymethylmethacrylate — cadmium sulfide nanocomposites involving precipitation of CdS nanoparticles from polymethylmethacrylate solution in methylmethacrylate monomer with its subse...
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Article
Anti-stokes fluorescence of polymethine dyes excited by a titanium-sapphire laser
Fluorescence of symmetric polymethine dye solutions (λ abs max ≈ 700 nm) upon anti-Stokes excitation by cw radiation of a titanium-sapphire laser (781 nm) is first i...
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Article
Spectral and luminescent properties of sensitizers based on psoralen substitutes
Psoralens (furocoumarines) are photosensitizers of vegetative origin increasing the sensitivity of biological objects to near-ultraviolet radiation (UV-A, 320–400 nm). In the present work, the influence of sub...
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Article
Parametrical conversion of the frequency of organic lasers into the middle-IR range of the spectrum
The possibility of parametrical conversion of visible radiation of solid-state organic lasers into the middle-IR range of the spectrum in nonlinear GaSe1–x S x ...
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Article
A double-frequency solid-state laser on organic compounds
A double-frequency narrow-band tunable laser with a solid-state organic active medium pumped by the 2nd harmonic of a YAG–Nd3+ laser has been developed. The laser emits in the range from uv (with frequency doubli...
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Article
Effect of excited state absorption on the transmissivity of organic-dye-based media under two-photon excitation
duration ranging from femtoseconds to nanoseconds has been simulated. The effect of the absorption from excited singlet and triplet states on the transmissivity of the medium under two-photon excitation has be...
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Article
Limiting the intensity of femtosecond pulses with anti-stokes excitation of organic dye solutions
Results of experimental investigations into the nonlinear absorption of the symmetric polymethine 1-butyl -3,3-dimethyl-2-[5-(1-butyl-3,3-dimethyl-3H-benz[e]indoline-2-uledene)-1,3-pentadienyl]-3H-benz[e]indol...
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Article
Optical properties of CdS/MMA dispersions and CdS/PMMA nanocomposites prepared by one-step, size-controlled synthesis
Results of investigations into the optical properties of semiconductor quantum dots (including absorption, fluorescence, and nonlinear scattering) in CdS/MMA dispersions and CdS/PMMA composites prepared by one...
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Article
Investigation of the toxicity of aqueous media after high-energy exposure by the spectralluminescent methods
The spectral and luminescent characteristics of aqueous solutions in the presence of phenol and natural organic acids are investigated after high-energy exposure (to a diffuse barrier discharge or an electron ...
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Article
Luminescent solar concentrators. I. Concentrators based on mixtures of dyes in PMMA. Spectral and luminescent properties, reabsorption and energy transfer
Spectral and luminescent properties of efficient and stable commercial organic dyes in solutions and polymethylmetacrilate (PMMA), absorbing and emitting in wavelength ranges 300–680 nm and 390–750 nm, respect...
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Article
Stability and spectral-luminescence properties of CdS and ZnS nanoparticle dispersions, synthesized in various solvents
Stable colloidal solutions of CdS and ZnS nanoparticles of diameter 3–6 nm in ethyl acetate (EA), 2-hydroxy ethyl methacrylate (HEMA), and H2O have been obtained. The size of the synthesized nanoparticles did not...
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Article
Silver-nanoparticle based bactericidal coating for poly(glycolide-co-lactide) suture threads obtained by the method of laser ablation of bulk targets in alcohol solutions
A laser ablation method is suggested to synthesize a dispersion of silver nanoparticles to create a bactericidal coating of biodegradable suture material from poly(glycolide-co-lactide) using a bulk target imm...