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    Wyświetlanie 1-14 z 14
    Tytuł:
    Cytotoxic Effects of Different ICG Concentrations and Laser Parameters on Neuroblastoma
    Autorzy:
    Ak, A.
    Kaya, Ö.
    Coşan, D.
    Gülsoy, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402428.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.62.-B
    87.19.XJ
    Opis:
    Photodynamic therapy (PDT) is a minimally invasive treatment for cancer therapy. It can be administered in combination with other treatments such as chemotherapy, radiotherapy, and surgical excision. PDT involves a photosensitizing agent that is activated by exposure to a specific wavelength of light. PDT is a cold photochemical process, there is no tissue heating. In our study, we investigated whether different laser parameters with different concentrations of indocyanine green (ICG) have cytotoxic and anti-proliferative effects on neuroblastoma. Plates were divided groups as control, only ICG concentrations (25 and 50 μg/ml), only laser treatment I (50 J/cm²), only laser treatment II (100 J/cm²), 25 μg/ml ICG + laser treatment I and 25 μg/ml ICG + laser treatment II, 50 μg/ml ICG + laser treatment I and 50 μg/ml ICG + laser treatment II. Neuroblastoma cell lines were irradiated with an in-house developed diode laser system (λ=809 nm, 70 mW/cm², 50 & 100 J/cm²) in continuous wave operation mode after ICG application. Cell proliferation was measured by XTT assay after light irradiation. Cell proliferation was decreased in a dose-dependent manner in 25 and 50 μg/ml ICG concentrations when compared with control. The applied ICG concentrations (especially 50 μg/ml) had cytotoxic effects for neuroblastoma cell lines, SH-SY5Y. There was no difference between laser treatment groups (L 50 & 100 J/cm²). However, PDT groups (laser exposure with ICG) showed significant inhibition of cell viability (p<0.05). Additionally, laser exposure did not increase the well temperature above the incubation parameter. In conclusion, PDT has cytotoxic effects in neuroblastoma cell lines. Appropriate ICG dose - laser parameter combinations must be determined for each cell type. Different energy densities may cause different effects of PDT on inhibition of cell viability.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-381-B-383
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigations of Quantum Cascade Lasers for Free Space Optics Operating at the Wavelength Range of 8-12 μm
    Autorzy:
    Nowakowski, M.
    Gutowska, M.
    Szabra, D.
    Mikołajczyk, J.
    Wojtas, J.
    Bielecki, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1493253.pdf
    Data publikacji:
    2011-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.62.-b
    01.50.Pa
    Opis:
    The paper presents analysis and preliminary investigations of quantum cascade lasers for free space optics. The lasers radiate in the long wavelength IR spectral range (8-12 μm). Because of lower effects of radiation scattering than in the case of 1.5 μm free space optics, better transmission range can be obtained. The main task of the work was experimental investigation of quantum cascade lasers taking into consideration free space optics applications. In the research, quantum cascade lasers operating in both pulse and continuous wave modes were used. The lasers spectra as well as the operation characteristics (e.g. voltage vs. current) were measured. In conclusion, the quantum cascade lasers parameters for free space optics system applications are summarized.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 4; 705-708
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure Changes of Nickel-Base Superalloys Induced by Interaction with Femtosecond Laser Beam
    Autorzy:
    Petronic, S.
    Drecun-Nesic, S.
    Milosavljevic, A.
    Sedmak, A.
    Popovic, M.
    Kovacevic, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791235.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    01.55.+b
    42.62.-b
    81.05.Bx
    Opis:
    The investigation was performed on nickel-base superalloys, with nickel being the most influential alloying ingredient. After thermo-mechanical preparation and corresponding processing, femtosecond laser beam machining has been performed. The laser wavelength was 800 nm. The exposition time, during which the samples have been exposed to the pulses of femtosecond laser beam varied, as well as the average output power. The changes of both the output power and the exposition time enabled the samples to be irradiated with different total energy during each exposition. The changes in samples microstructure were observed with optical and scanning electron microscopy, with energy-dispersive spectrometry, and analyzed as well. Microhardness measurements of both base material and ablated spots have been performed.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 550-552
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ruby Laser Interaction with Austenite Structural Materials
    Autorzy:
    Milosavljević, A.
    Petronić, S.
    Srećković, M.
    Ristić, S.
    Nešić, I.
    Pljakić, R.
    Negovanović, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1808064.pdf
    Data publikacji:
    2009-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    01.55.+b
    42.62.-b
    81.05.-t
    Opis:
    The investigations were carried out on chrome nickel steel and nickel based superalloy samples thermo-mechanically treated to obtain optimal mechanical properties and surface stability. Chrome nickel steel and a few nickel based superalloys samples were exposed to the laser beam before creep deformation process. The second group of nickel based superalloy samples were exposed after the creep deformation. The damages occurred by exposing of chrome nickel steel and nickel base superalloy samples to the ruby laser were analyzed by scanning electron microscope and energy-dispersive X-ray spectrometry. In this paper, the influence of laser dynamical regime (MW/$mm^{2}$) to the microstructural changes of heat treated chrome nickel steel and nickel based superalloy are analyzed and discussed.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 4; 823-825
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multispectral Laser Head for Terrain Identification and Analysis
    Autorzy:
    Mierczyk, Z.
    Zygmunt, M.
    Kaszczuk, M.
    Muzal, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399385.pdf
    Data publikacji:
    2013-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.70.Ce
    65.40.G-
    42.62.-b
    Opis:
    The reflectance profilometer, constructed in Institute of Optoelectronics, Military University of Technology, is an optoelectronic device based on the laser remote sensing technique, designed for use on unmanned aerial vehicles. The main task of the profilometer is to analyze the reflectance signals for laser radiation from the multispectral range: 850, 905, and 1550 nm. On the basis of the analysis the profilometer enables two fundamental functions: to define the shape of the ground and identify elements of terrain coverage, along with analysis of its physicochemical properties. The reflectance profilometer is a system based on a modern concept of measurement, allowing to obtain unique information about tested objects, whose measurements or detection are not possible by means of thermal imaging systems and systems operating in the visible range. The received information is visualized in 3D format, which allows for more accurate, precise and comprehensive way of analyzed area model presentation.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 3; 502-504
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Models of Interactions of Laser Beams with Materials of Interest for Optical Components and Provoked Damages
    Autorzy:
    Srećković, M.
    Ilić, J.
    Kovačević, A.
    Pantelić, S.
    Latinović, Z.
    Borna, N.
    Ćosović, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047854.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.40.Wx
    61.80.Ba
    42.62.-b
    Opis:
    Models of interactions of laser beams with materials of interest for optical components are presented in this paper. Special attention is paid to damages which appear within both active materials and optical components along the path of a propagating beam with theoretical treatment via various models.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 935-940
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optodynamic Characterization of Laser-Induced Bubbles
    Autorzy:
    Gregorčič, P.
    Možina, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047899.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.62.-b
    47.40.-x
    47.55.dd
    Opis:
    Laser-induced bubbles can be caused by an optical breakdown in water. They are a result of the optodynamical process where the energy of a high intensity laser pulse is converted into the mechanical energy through an optodynamic conversion. At this process the absorbed optical energy causes plasma expansion that in turn initiates dynamic phenomena: spreading of a shock wave and the development of a cavitation bubble. When the cavitation bubble reaches its maximum radius it starts to collapse due to the pressure of the surrounding liquid. This collapse in turn initiates a new bubble growth and bubble collapse. The process therefore repeats itself, resulting in so-called cavitation-bubble oscillations, with a new shock wave being emitted after every collapse. We present an optodynamic characterization of cavitation bubble's oscillations based on a laser beam-deflection probe. Employed setup enabled us one- or two-dimensional scanning with deflections of a laser probe beam. Deflections were detected with a fast quadrant photodiode.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 1137-1143
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fine-Scale Structure Investigation of Nimonic 263 Superalloy Surface Damaged by Femtosecond Laser Beam
    Autorzy:
    Milosavljevic, A.
    Petronic, S.
    Sreckovic, M.
    Kovacevic, A.
    Krmpot, A.
    Kovacevic, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791236.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    01.55.+b
    42.62.-b
    81.05.Bx
    81.20.Vj
    Opis:
    Due to the specific conditions of manufacturing, processing and utilization of nickel-base superalloys, the implementation of contemporary precision techniques is necessary in the research of the alloys features. Multi-component nickel-base superalloys, with about of 50% of nickel content, are commonly exploited in the conditions of high temperatures and pressures as well as in various aggressive operating environments. For successful quality control, which includes the monitoring of the changes in the alloy microstructure, fine-scale structure investigations are necessary. In this work, the samples of nickel-base superalloys have been exposed to 800 nm femtosecond laser in various operating regimes. Surface damages and dents caused by femtosecond laser pulses have been observed by optical and scanning microscopy.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 553-556
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on the Breakdown Mechanism of Fabrication of Micro Channels in Fused Silica Substrates with ps Laser Pulses
    Autorzy:
    Li, S.
    Bai, Z.
    Qin, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400288.pdf
    Data publikacji:
    2013-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.50.Jm
    52.40.Hf
    61.80.-x
    42.62.-b
    Opis:
    A new microchannel fabrication technology for fused silica substrate is presented. A mode-locked laser was used to fabricate straight microchannels in a fused silica substrate by laser plasma-induced plasma. The depth of the channels is up to 5 mm and there are no thermal cracks around the channel. We studied the ionization mechanism of optical breakdown formed by laser pulses and discussed the optical breakdown threshold. A mechanism is proposed to explain the formation of the microchannels and the characteristics of the microchannels are analyzed through the laser pulse characteristics.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 1; 67-72
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Laser Interaction with Material - Theory, Experiments and Discrepancies
    Autorzy:
    Srećković, M.
    Ilić, J.
    Davidović, M.
    Djokić, B.
    Tomić, Ž.
    Latinović, Z.
    Družijanić, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1795618.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    01.55.+b
    42.62.-b
    42.25.Bs
    81.40.Wx
    61.80.Ba
    Opis:
    The experimental treatment of chosen material with laser beams, starting from continuous wave up to fs pulses, produces the necessity to find the common and sophisticated theoretical approaches to interaction modeling. For chosen materials, some laser treatment and damage analyses are performed. The provoked stresses and parameters of transport processes (penetration depth) are calculated by using the programs for electrical circuit analyses. Some inconsistencies in the treatment of large area laser-material interaction are discussed.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 618-621
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface Modification of Metallic Targets with Ultrashort Laser Pulses
    Autorzy:
    Gakovic, B.
    Stasic, J.
    Petrovic, S.
    Radak, B.
    Krmpot, A.
    Jelenkovic, B.
    Trtica, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1795615.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.62.-b
    61.80.Ba
    61.82.Bg
    79.20.Eb
    Opis:
    Interaction of pulsed femtosecond Ti:sapphire laser (160 fs), operating at high repetition rate (75 MHz) at 800 nm, with nickel-based superalloy Inconel 600 and tungsten-titanium (WTi) target was studied. The WTi target was in form of thin film deposited on silicon substrate. Low laser fluence of maximum 50 mJ/cm^{2} had modified the target surface during irradiation/exposure time of seconds or minutes. The radiation absorbed from the laser beam generates at the surface a series of effects, such as direct material vaporization, formation of clusters, etc. Morphological features of the targets can be summarized as: (a) intensive removal of material and crater appearance; (b) creation of nanostructures; (c) microcracking, etc. Ablation of Inconel 600 surface is effective, resulting in formation of holes with small diameter ( ≤ 10 μm) and relatively large depth ( ≤ 50 μm). In case of WTi target/thin film, the surrounding rim is not so expressed, and crater depths are lower. It can be concluded that the average laser power of the order of watts, pulse energies of the order of nanojoules and high repetition rates (MHz range) can successfully modify metallic materials.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 611-613
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Single Pulse Laser Ablation of AISI 316L Stainless Steel Surface Using Nd:YAG Laser Irradiation
    Autorzy:
    Demir, P.
    Kacar, E.
    Akman, E.
    Demir, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1195232.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.62.-b
    44.05.+e
    44.10.+i
    61.82.-d
    61.82.Bg
    79.20.Eb
    Opis:
    The interaction of single-pulse Nd:YAG laser, operating at 1064 nm wavelength and 6 ns pulse duration, with AISI 316L stainless steel target surface was investigated experimentally and theoretically. Surface modification of stainless steel using laser irradiation was studied by observing the effects of varying incident laser pulse intensities on surface morphology. Surface structure of laser treated stainless steel was determined by optical microscopy and profilometry analyses. Numerical calculation by heat transfer equation was performed for single laser pulse irradiation. The results, obtained by theoretical and experimental processes, of the interaction between single-pulse Nd:YAG laser irradiation and AISI 316L stainless steel target surface are reported.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 439-441
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Applications of a compact "water window" source for investigations of nanostructures using SXR microscope
    Autorzy:
    Torrisi, A.
    Wachulak, P.
    Fahad Nawaz, M.
    Bartnik, A.
    Adjei, D.
    Vondrová, Š.
    Turňová, J.
    Jančarek, A.
    Fiedorowicz, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1065141.pdf
    Data publikacji:
    2016-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.38.-r
    42.30.-d
    42.62.-b
    87.59.-e
    68.37.Yz
    07.85.Tt
    41.50.+h
    42.79.Dj
    Opis:
    A compact soft X-ray microscope based on a nitrogen double-stream gas puff target soft X-ray source, operating at He-like nitrogen spectral line at the wavelength of λ =2.88 nm is presented. The desk-top size microscope was successfully demonstrated in transmission mode using the Fresnel zone-plate objective and it is suitable for soft X-ray source microscopy in the "water window" spectral range (λ = 2.3÷ 4.4 nm). Details about the soft X-ray source source, the microscope and an example of application in the biomedical field are shown and discussed.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 2; 169-171
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure Development in Multilayer $TiB_x // TiSi_y C_z$ Coatings during Post-Deposition Heat Treatment
    Autorzy:
    Twardowska, A.
    Rajchel, B.
    Morgiel, J.
    Mędala-Wójcik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398372.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Cd
    81.20.-n
    42.62.-b
    61.43.Dq
    68.37.-d
    68.37.Lp
    68.65.Ac
    64.70.Kb
    Opis:
    Multilayer amorphous $TiB_{x} // TiSi_{y}C_{z}$ coatings were formed by duplex treatment: dual beam ion beam assisted deposition and pulsed laser deposition. Post-deposition heating was applied to activate crystallization in the coating. In situ transmission electron microscopy heating experiments were conducted in the temperature range 20-600°C. Crystallization of TiB₂ phase in $TiB_{x}$ layers begun at 450°C, while $TiSi_{y}C_{z}$ layers retained nearly amorphous up to 600°C.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 1124-1126
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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