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    Tytuł:
    Magnetothermoelastic vibrations on a viscoelastic microbeam subjected to a laser heat source
    Autorzy:
    Abouelregal, A. E.
    Zenkour, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/38614523.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    thermoviscoelasticity
    microbeams
    laser pulse
    magnetic field
    Opis:
    The linear theory of viscoelasticity remains an important field of research like most solids and polymer materials when exposed to a vicious dynamic loading effect. This article introduces a new model for describing the behavior of thermoviscoelastic microbeams considering the effects of temperature change and the longitudinal magnetic field. The governing equations in this model are derived based on the Euler–Bernoulli beam theory, Kelvin–Voigt model of viscosity, the generalized thermoelasticity, and the classical Maxwell equations. The two ends of the microbeam are clamped and subjected to the influence of a laser pulse with a temporal intensity profile. The analytical solutions to the physical fields are evaluated using the Laplace transform and its inversion transforms are performed numerically. The thermo-viscoelastic responses of the microbeam are calculated numerically and investigated graphically. The effect of different parameters such as viscosity, laser intensity, and the magnitude of the magnetic field are studied in detail.
    Źródło:
    Archives of Mechanics; 2021, 73, 1; 3-26
    0373-2029
    Pojawia się w:
    Archives of Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A generalized thermoelastic medium subjected to pulsed laser heating via a two-temperature model
    Autorzy:
    Abouelregal, Ahmed E.
    Zenkour, Ashraf M.
    Powiązania:
    https://bibliotekanauki.pl/articles/949139.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    two-temperature model
    thermoelasticity
    non-Gaussian laser pulse
    laser intensity
    Opis:
    This article investigates stress and induced temperature in an isotropic, homogeneous, thermoelastic half-space using a two-temperature generalized thermoelasticity model. The bounding plane surface of the present half-space continuum is subjected to a non-Gaussian laser pulse. Laplace’s transform space is considered to deduce a closed-form solution to the problem. In addition, the inversions of Laplace’s transformations have been carried numerically to obtain field quantities in the transient state. The effects of parameters of two-temperature, laser-pulse and laser intensity are investigated. A concluding remark for the graphical forms of the derived expressions is presented.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2019, 57, 3; 631-639
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Control of the propagation of intense laser pulses in gas for laser plasma acceleration
    Autorzy:
    Giulietti, D.
    Cecchetti, C. A.
    Drenska, N. V.
    Faccini, N.
    Gatti, C.
    Gatti, G.
    Giulietti, A.
    Gizzi, L.
    Labate, L.
    Levato, T.
    Martellotti, S.
    Pathak, N.
    Valente, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/147890.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    intense laser pulses
    ultra-short laser pulse
    laser plasma
    plasma acceleration
    Opis:
    The role of the propagation mechanisms of intense and ultra-short laser pulses in gas is presented, as well as the first results of the laser plasma acceleration (LPA) tests at Frascati National Laboratories (INFN), in the frame of NTA-PLASMONX project.
    Źródło:
    Nukleonika; 2012, 57, 2; 221-225
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical simulation of thermal processes proceeding in a multi-layered film subjected to ultrafast laser heating
    Symulacja numeryczna procesów cieplnych zachodzących w wielowarstwowych mikroobszarach poddanych działaniu ultrakrótkiego impulsu laserowego
    Autorzy:
    Majchrzak, E.
    Mochnacki, B.
    Suchy, J. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/281751.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    microscale heat transfer
    thin films
    laser pulse
    numerical modelling
    Opis:
    In the paper, the mathematical model, numerical algorithm and examples of computations concerning thermal processes proceeding in a multi-layered thin film subjected to an ultrafast laser pulse are discussed. The equations describing a course of the analysed process correspond to the dual-phase-lag model and contain both the relaxation time tau q and additionally the thermalization time tau T. At the stage of numerical simulation, the finite difference method has been used. The algorithm is based on an artificial decomposition of the domain considered, while common thermal interactions between successive layers are taken into account using conditions of heat flux and temperature continuity at points corresponding to internal boundaries (1D task has been considered).
    W pracy przedstawiono model matematyczny, algorytm numeryczny i przykłady symulacji dotyczących przebiegu procesów cieplnych w wielowarstwowym mikroobszarze nagrzewanym ultraszybkim impulsem generowanym przez laser. Równanie opisujące przebieg procesu odpowiada modelowi z dwoma opóźnieniami wynikającymi z czasu relaksacji i czasu termalizacji. Na etapie obliczeń numerycznych wykorzystano metodę różnic skończonych. Algorytm bazuje na sztucznej dekompozycji obszaru wielowarstwowego, przy czym wzajemne oddziaływania między warstwami uwzględniono poprzez założenie ciągłości strumienia ciepła i pola temperatury na powierzchniach kontaktu. Biorąc pod uwagę geometrię obszaru, rozpatrywano zadanie jednowymiarowe.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2009, 47, 2; 383-396
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A two dimensional problem on laser pulse heating in thermoelastic microelongated solid
    Autorzy:
    Ailawalia, Praveen
    Sachdeva, Sunil Kumar
    Pathania, Devinder Singh
    Powiązania:
    https://bibliotekanauki.pl/articles/240726.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    laser pulse
    thermoelasticity
    normal mode
    microelongation
    impuls laserowy
    termosprężystość
    Opis:
    In the present discussion, the plane strain deformation due to laser pulse heating in a thermoelastic microelongated solid has been discussed. The analytic expressions for displacement component, force stress, temperature distribution and micro-elongation have been derived. The effect of pulse rise time and micro-elongation on the derived components have been depicted graphically.
    Źródło:
    Archives of Thermodynamics; 2019, 40, 2; 69-85
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magneto-thermoelastic problem in the context of four theories under influence of laser pulse and gravity field
    Autorzy:
    Abo-Dahab, Sayed
    Abd-Alla, Abdelmooty
    Alqarni, Abdelkalk
    Powiązania:
    https://bibliotekanauki.pl/articles/240083.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    generalized thermoelasticity
    gravity
    laser pulse
    magnetic field
    half-space
    Opis:
    The paper is devoted to study the effect of gravity, magnetic field and laser pulse on the general model of the equations of generalized thermoelasticity for a homogeneous isotropic elastic half-space. The formulation is applied under four theories of generalized thermoelasticity: the coupled theory, Lord-Schulman theory, Green-Lindsay theory as well as Green-Naghdi theory. By employing normal mode analysis, the analytical expressions for the displacement components, temperature and the (mechanical and Maxwell’s) stresses distribution are obtained in the physical domain. These expressions are also calculated numerically and corresponding graphs are plotted to illustrate and compare the theoretical results. The effect of gravity, magnetic field and laser pulse are also studied and displayed graphically to show the physical meaning of the phenomena. A comparison has been made between the present results and the results obtained by the others. The results indicate that the effects of magnetic field, laser pulse and gravity field are very pronounced.
    Źródło:
    Archives of Thermodynamics; 2020, 41, 1; 31-66
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Two-temperature theory for a heated semi-infinite solid by a pulsed laser radiation
    Autorzy:
    Zenkour, Ashraf M.
    Abouelregal, Ahmed E.
    Powiązania:
    https://bibliotekanauki.pl/articles/240137.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermoelasticity
    two-temperature
    non-Gaussian laser pulse
    laser intensity
    phase lags
    Opis:
    In this paper, the two-temperature thermoelasticity model is proposed to a specific problem of a thermoelastic semi-infinite solid. The bounding plane surface of the semi-infinite solid is considered to be under a non-Gaussian laser pulse. Generalized thermoelasticity analysis with dual-phase-lags is taken into account to solve the present problem. Laplace transform and its inversion techniques are applied and an analytical solution as well as its numerical outputs of the field variables are obtained. The coupled theory and other generalized theory with one relaxation time may be derived as special cases. Comparison examples have been made to show the effect of dual-phase-lags, temperature discrepancy, laser-pulse and laser intensity parameters on all felids. An additional comparison is also made with the theory of thermoelasticity at a single temperature.
    Źródło:
    Archives of Thermodynamics; 2020, 41, 2; 85-101
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stabilny sterownik półprzewodnikowych laserowych diod impulsowych dla dalmierza laserowego
    Stable pulsed laser diode driver for rangefinder
    Autorzy:
    Jakubaszek, M.
    Zygmunt, M.
    Muzal, M.
    Młodzianko, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/208834.pdf
    Data publikacji:
    2014
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    półprzewodnikowe diody laserowe
    sterowniki impulsowych diod laserowych
    dalmierze laserowe
    pulse laser driver
    pulse laser rangefinders
    semiconductor pulse laser driver
    Opis:
    W artykule przedstawiono podstawowe metody sterowania impulsowymi diodami laserowymi stosowanymi w układach nadajników dalmierzy laserowych wraz ze wskazaniem ich wad i zalet. Na podstawie tej analizy zaproponowano układ sterownika oraz przedstawiono teoretyczne podstawy jego działania. Układ testowy został wykonany i przebadany w Instytucie Optoelektroniki Wojskowej Akademii Technicznej.
    This article presents comparison of methods of driving pulse laser diodes. Based on the results of shown analyses, the new design of pulse laser diode driver, using MOSFET transistor, was developed. The driver allows stable pulse laser pumping that is required for stable pulse laser emission in high accuracy lasers’ rangefinders. Design and theory of operation of the driver is shown, as well as working parameters acquired by testing of the prototype module.
    Źródło:
    Biuletyn Wojskowej Akademii Technicznej; 2014, 63, 1; 43-61
    1234-5865
    Pojawia się w:
    Biuletyn Wojskowej Akademii Technicznej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Generalized thermoelastic functionally graded half space under surface absorption of laser radiation
    Autorzy:
    Allam, M. N. M.
    Tayel, I. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/279539.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    laser pulse
    generalized thermoelasticity
    non-homogeneous medium
    numerical inverse of Laplace transform
    Opis:
    The subject of this paper is to study the thermoelastic behavior of a functionally graded semi-infinite medium heated uniformly by a laser beam having temporally Gaussian distribution. The surface of the medium is taken as traction free. The general solution is obtained in the Laplace transform domain. The inverse of the Laplace transform is computed numerically using the Riemann-sum approximation method. The numerical results for temperature, displacement and stress are obtained and presented graphically for the generalized theory of thermo-elasticity with one relaxation time.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2017, 55, 1; 155-165
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Absorption coefficient along a propagated ultra-short laser pulse in the air based on Kramers–Kronig relations
    Autorzy:
    Malekshahi, M
    Naghavi, K
    Powiązania:
    https://bibliotekanauki.pl/articles/173894.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    ultra-short laser pulse
    refractive index
    self-phase modulation
    absorption coefficient
    Kramers–Kronig relations
    Opis:
    In this manuscript, some effects such as nonlinear Kerr, stimulated Raman, and plasma generation effects lead to obtaining the nonlinear refraction index of the air along an intense ultra-short laser pulse based on one-dimensional propagation analysis. The variations in the pulse frequency by the self-phase modulation effect are investigated for achieving the functionality of the refractive index to the frequency. The mentioned functionality allows implementing Kramers–Kronig relations to measure the absorption coefficient. Results indicate that the front of the laser pulse faces a high rate of the energy loss whereas the back of the pulse experiences a gain. The implementation of Kramers–Kronig relations for a theoretical calculation of absorption coefficient variation along a laser pulse propagating in the air in which we have simultaneously taken into account the three above-mentioned effects distinguishes our work from other studies.
    Źródło:
    Optica Applicata; 2015, 45, 4; 501-512
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ponderomotive self-focusing of a short laser pulse under a plasma density ramp
    Autorzy:
    Kant, N.
    Saralch, S.
    Singh, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/146636.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    self-focusing
    underdense plasma
    plasma density ramp
    ponderomotive force
    short laser pulse
    Gaussian beam
    Opis:
    The ponderomotive self-focusing of a short laser pulse in an underdense plasma under a plasma density ramp is analyzed. The pulse may acquire a minimum spot size due to the ponderomotive self-focusing. Beyond the focus, the nonlinear refraction starts weakening, and the spot size of the laser pulse increases, resulting in an oscillatory self-focusing and defocusing behavior of the beam with the propagation distance. In order to minimize the defocusing, we introduce a localized upward plasma density ramp. Due to the upward plasma density ramp, the laser beam retains a minimum spot size. Self-focusing becomes stronger with a mild ripple as the propagation distance increases. The conditions for the ponderomotive self-focusing for suitable parameters of the laser beam and the plasma are determined. The plasma density ramp of the considered type may be observed in gas jet plasma experiments.
    Źródło:
    Nukleonika; 2011, 56, 2; 149-153
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Irreversible blocking of polar excitations on frog sciatic nerve using semiconductor pulse laser irradiation
    Autorzy:
    Hirayama, Y.
    Ishizuka, S.
    Yamakawa, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/385078.pdf
    Data publikacji:
    2009
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    irreversible blocking
    semiconductor pulse Laser Irradiation
    frog sciatic nerve
    Opis:
    The final purpose of our research is to cripple the epileptogenic focus by laser irradiation. However, the effect of laser irradiation on brain nerves is not well known. In this paper, we observed laser irradiation to the transmission of action potential of a bullfrog sciatic nerve in the experiment. In addition the marginal amplitude of laser energy is obtained. The bullfrog nerve preparations were stimulated supramaximal intensity pulse. The pulse width and the pulse interval are 1 msec and 1 sec, respectively. A semiconductor pulse laser irradiation (the wavelength, the pulse width and the frequency are 808 nm, 990 µsec and 50 Hz, respectively) was employed until when the amplitude of the action potential decreases to 10 %. The laser light was irradiated to the portion between two electrode pairs for recording. The energy of the laser is variable between 13.9- 202.5 mJ/cm2. The laser irradiator is connected to an optical fiber whose diameter is 1 mm. The action potential of the sciatic nerve is observed at 1 day after in order to confirm irreversibility. The experiment was delivered by the laser pulse, the energy of which over 32.9 mJ/cm2. The peak of action potential was decreased gradually by laser irradiation with depending on the time of irradiation. The time to blocking is reciprocally proportional to laser energy. At a day after the experiment, the action potential was not recovered. This result shows the laser irradiation give irreversible blocking to polar excitations. We observed the frog sciatic nerve is damaged by laser irradiation. The results show a possibility that the epileptogenic focus can be crippled by laser irradiation. We are going to have more experiments and obtain important laser parameters. In the future, the experiment and the result are expanded using rat brain and applied human surgery.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 4; 210-212
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Collinear double-pulse laser-induced breakdown spectroscopy using Nd:YAG laser generating two nanosecond pulses of regulated energy ratios
    Autorzy:
    Skrzeczanowski, Wojciech
    Skórczakowski, Marek
    Żendzian, Waldemar
    Powiązania:
    https://bibliotekanauki.pl/articles/27311741.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    dual-pulse laser
    double-pulse LIBS
    signal enhancement
    self-absorption
    factorial analysis
    Opis:
    In the paper results of single- and double-pulse LIBS (Laser-Induced Breakdown Spectroscopy) measurements in collinear geometry are described. The experiments were performed using a unique self-made Nd:YAG laser operating in the Q-switching regime, where the laser transmission losses are switched. Such a laser allowed for an easy and quick change of the operating mode (one and two pulses), free shaping of the energy ratio of the two pulses (division of the energy of a single pulse into two parts) and a smooth change of the delay time between pulses in the range from 200 ns to 10 μs. To our knowledge, such a laser was used in LIBS measurements for the first time. LIBS experiments revealed strong self-absorption depending on energy ratios carried out in the first and second laser pulse in the double-pulse mode. This was confirmed also by statistical factorial analysis of LIBS spectra. Plasma temperature and LIBS signal enhancement were measured both for energy proportions between the first and the second laser pulse and for the first-to-second-pulse delay.
    Źródło:
    Metrology and Measurement Systems; 2023, 30, 2; 273--287
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Femtosecond photonics for three-dimensional high density optical data storage
    Autorzy:
    Kawata, Y.
    Tsuji, M.
    Inami, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/384323.pdf
    Data publikacji:
    2009
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    femtosecond pulse laser
    two-photon absorption
    confocal microscopy
    optical memory
    Opis:
    We have developed a high density optical data storage by using two-photon absorption process. We have developed a multilayered medium in which photosensitive layers and transparent pressure-sensitive adhesives layer were piled up alternately. We also demonstrate the development of compact high power fiber laser as a light source of high density optical data storage system.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 4; 9-11
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of pulsed laser radiation on a thermoviscoelastic semi-infinite solid under two-temperature theory
    Autorzy:
    Othman, M. I.
    Abouelregal, A. E. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/240353.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    generalized thermo-visco-elasticity
    two-temperature
    Non-Gaussian laser pulse
    laser intensity
    phase lags
    Kelvin-Voigt model
    termolepkosprężystość
    dwustopniowy
    niegaussowski impuls laserowy
    intensywność lasera
    model Kelvina-Voigta
    Opis:
    The purpose of this paper is to study the thermoviscoelastic interactions in a homogeneous, isotropic semi-infinite solid under two-temperature theory with heat source. The Kelvin-Voigt model of linear viscoelasticity which describes the viscoelastic nature of the material is used. The bounding plane surface of the medium is subjected to a non-Gaussian laser pulse. The generalized thermoelasticity theory with dual phase lags model is used to solve this problem. Laplace transform technique is used to obtain the general solution for a suitable set of boundary conditions. Some comparisons have been shown in figures to estimate the effects of the phase lags, viscosity, temperature discrepancy, laser-pulse and the laser intensity parameters on all the studied fields. A comparison was also made with the results obtained in the case of one temperature thermoelasticity theory.
    Źródło:
    Archives of Thermodynamics; 2017, 38, 3; 77-99
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Poszerzenie widma impulsu laserowego poprzez zastosowanie przewężki dwustronnej na standardowym włóknie jednomodowym
    Broadening of a pulse laser spectrum obtained by bionical taper on a standard single mode optical fiber
    Autorzy:
    Stasiewicz, K. A.
    Młyńczak, J.
    Jaroszewicz, L. R.
    Kopczyński, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/211082.pdf
    Data publikacji:
    2007
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    poszerzenie impulsu
    efekt supercontinuum
    przewężka światłowodowa
    laser impulsowy
    broadening of a pulse
    supercontinuum generation
    optical fiber taper
    pulse laser
    Opis:
    Praca przedstawia eksperymentalne wyniki poszerzenia impulsu laserowego dużej mocy w standardowych światłowodach telekomunikacyjnych. Poszerzenie uzyskano poprzez wykorzystanie technologii przewężki dwustronnej, której optymalizacja dla danego typu włókna pozwala na sterowanie tak szerokością impulsu jak i składem widmowym wychodzącej wiązki, prowadząc w konsekwencji do generacji światła białego.
    The papers describes the results of a laser pulse broadening in tapered standard single mode fiber. Additional description of a set - up for taper manufacturing, with a principle of its operation, based on elongation procedure of fiber-optics in a low-pressure gas burner, is also presented. A virtue of such a set-up is the possibility of different kinds of taper manufacturing, like punctual, long distance on regular or increasing distance. Tapering process allows us to change a diameter of an optical fiber what means boundary condition changes, beam is propagating in a core (made from silica) surrounded by air. There is a large refractive index step between these two media, allowing for confined pulse (with high power) in a very small area. This effect causes increasing intensity of a propagated beam and amplifies nonlinear effects, like self-phase modulation etc. The article presents the results of pulse broadening obtained in different tapers, made on a single-mode fiber for a wavelength of 1310 nm and a core diameter of about 9 žm. As a light source, the pumped laser operated at a wavelength of 532 nm, which emitted the pulses of 0.6 ns with a repetition rate of about 1 kHz, has been used. All the measured fibers with a taper have a length of about 3 m, where about 1.2 m was for the input (for easier launching) and the output (for easier connection with an optical spectrum analyzer). Experimental results show the pulse broadening in the used taper structures. The best result are obtained for a long distance taper, where the elongated part was about 50 mm (flame brush is travelling to and from along the constant length). For this taper, it can be observed more flat spectrum broadening to the longer wavelength, together with increasing average power of a laser. Theoretically the best broadening we should obtain for a taper length of about 100 mm what will be one of the next subjects of our research. Other tapers also cause broadening effects but their spectra are not so flat. Interesting example is a taper with an increasing length of elongation. We observed additional spectral pick at the wavelength of about 630 nm and 950 nm. These picks are connected with the smaller core diameter obtained in this type of tapering process (the smaller core, the larger broadening). The worst results were for a punctual taper. In this case, a diameter of a taper is very small (about several micrometers) but the losses are very high. The presented results show that biconical tapered single mode optical fiber is a good way to obtain spectral broadening (supercontinuum effect).
    Źródło:
    Biuletyn Wojskowej Akademii Technicznej; 2007, 56, 4; 155-165
    1234-5865
    Pojawia się w:
    Biuletyn Wojskowej Akademii Technicznej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of plasma expansion plumes in view of pulses laser irradiating centimeter-scale spherical space debris
    Autorzy:
    Fang, Yingwu
    Powiązania:
    https://bibliotekanauki.pl/articles/27310108.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    plasma expansion plume
    pulse laser
    centimeter-scale spherical space debris
    dynamic model
    Opis:
    The objective of this article was to investigate the dynamic evolution behaviors of plasma expansion plumes by pulses laser irradiating centimeter-scale spherical space debris. A calculated model of centimeter-scale spherical space debris irradiated by pulses laser was firstly deduced based on FEM (finite element method)/COMSOL, and the action rules of plasma expansion plumes by pulses laser-generated irradiating the debris were simulated for different laser powers and action times. The results showed that the velocity of plasma expansion plumes was increased with the increase of laser powers and action times. Especially, when the laser power was 700 kW and the action time was close to 25 μs, the maximum velocity of plasma expansion plumes approached 1.91 km/s, and the diffusion radius of plasma expansion plumes was increased by about 2.5 mm. Further, the diffusion radius was about twice that of 400 kW when the action time reached about 48 μs. As a result, by simulating the transient flow process of nanosecond pulses laser irradiating small spherical space debris, the flow field evolution information and plasma plumes evolution characteristics of centimeter-scale space debris at nanosecond time resolution were revealed.
    Źródło:
    Optica Applicata; 2023, 53, 3; 363--375
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pomiary charakterystyk wiązek laserowych stosowanych do obróbki materiałów
    Measurements of characteristics of laser beams applied in processing of materials
    Autorzy:
    Sarzyński, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/160069.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
    Tematy:
    impuls laserowy
    parametr M2
    wiązka gaussowska
    prawa podobieństwa układów ogniskujących
    laser pulse
    M2 parameter
    Gaussian beam
    similarity laws for focusing systems
    Opis:
    W pracy zamieszczono wyniki pomiarów charakterystyk laserów stosowanych do obróbki materiałów. Zamieszczono schemat układu pomiarowego. Opisano charakterystyczne cechy wiązek Gaussowskich i sposób obliczania parametru M2, charakteryzującego jakość wiązki laserowej. Podano prawa podobieństwa dla różnych układów ogniskujących. Mierzono rozkłady gęstości energii w przekroju poprzecznym wiązki, czasowy kształt impulsu, stabilność mocy wiązki w funkcji czasu oraz wyznaczano parametr M2. Pomiary przeprowadzono dla lasera He-Ne, lasera włóknowego ciągłego działania SPI-100C o mocy 100 W, włóknowego lasera impulsowego Ylia M20EG oraz pikosekundowego lasera Nd:YAG. Podano przykłady czynników zwiększających błędy pomiarowe. Zamieszczono przykłady zastosowania wyników pomiarów do procesu znakowania laserowego.
    The results of measurements of characteristics of laser beams applied in processing of materials are described in the paper. The scheme of experimental setup is described. The specific properties of Gaussian laser beams are posted. The procedure for determination of laser beam quality parameter, the so called M2 parameter is discussed. The laws of similarity of beams focused by different lenses are included. Distributions of energy density in the beam cross-section, temporal pulse shape, stability of laser Power versus time were measured. The M2 parameter was calculated. The measurements were performed for He-Ne, fiber CW SPI-100C, pulsed Ylia M20EG and picosecond lasers. Some examples of factors influencing measurements errors are listed. Some examples of laser marking process are provided.
    Źródło:
    Prace Instytutu Elektrotechniki; 2012, 256; 251-267
    0032-6216
    Pojawia się w:
    Prace Instytutu Elektrotechniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Generation of two identical ns laser pulses at single μs spacing by switching output mirror transmission
    Autorzy:
    Skórczakowski, Marek
    Żendzian, Waldemar
    Jankiewicz, Zdzisław
    Powiązania:
    https://bibliotekanauki.pl/articles/220917.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    double pulse Q-switched laser
    pulsed holographic interferometry
    transmission losses switching
    diode pumped Q-switched laser
    Opis:
    Generation of two identical ns laser pulses spaced by a single μs time interval by means of sequential switching of the output mirror transmittance in a diode-pumped Nd:YAG laser is reported, to our knowledge, for the first time. The theoretical study of the process of transmission losses switching is developed. This analysis confirms the possibility of generation of two identical Q-switched laser pulses with 100% efficiency with respect to the referenced single pulse energy. The detailed characterization of the laser in free-running, single and double Q-switching regimes is presented. The laser can be applied in different branches of metrology as PIV, LIBS or holographic interferometry.
    Źródło:
    Metrology and Measurement Systems; 2020, 27, 3; 513-530
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photothermal transformation in heterogeneous semiconductors structures under its pulse laser irradiation: role of electron-hole diffusion
    Transformacja fototermiczna w heterogenicznych strukturach półprzewodnikowych przy impulsowym pobudzeniu laserowym: rola dyfuzji elektron-dziura
    Autorzy:
    Isaiev, M.
    Kuryliuk, V.
    Kuzmich, A.
    Burbelo, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/356401.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    photothermal transformation
    heterogeneous structures
    electron-hole diffusion
    pulse laser irradiation
    transformacja fototermiczna
    struktura heterogeniczna
    dyfuzja elektron-dziura
    impulsowe pobudzenie laserowe
    Opis:
    In this paper photothermal transformation in semiconductor structures with modified properties of subsurface layer under its irradiation by pulse laser (~10 ns) radiation was analyzed. It was show that the presence of this surface modified layer leads to increasing of surface temperature in comparison with homogeneous case. Moreover, this increasing could even compensate the temperature decreasing induced by thermal source redistribution caused by charge carrier diffusion.
    W pracy zaprezentowano wyniki badań konwersji fototermicznej w półprzewodnikowych strukturach ze zmodyfikowanymi własnościami warstwy wierzchniej, pod wpływem impulsów laserowych o długości 10 ns. Obecność takiej zmodyfikowanej warstwy prowadzi do zwiększenia powierzchniowej temperatury w porównaniu do temperatury jednorodnej struktury. W pracy pokazano, że wzrost temperatury może kompensować spadek temperatury indukowanej przez przepływ związany dyfuzją nośników ładunku.
    Źródło:
    Archives of Metallurgy and Materials; 2013, 58, 4; 1351-1354
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Generacja mikrosekundowych impulsów laserowych
    Generation of microsecond laser pulses
    Autorzy:
    Ostrowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/159806.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
    Tematy:
    laser Nd:YAG
    wewnątrz-rezonatorowa konwersja częstotliwości
    czerwony laser
    wydłużanie impulsu
    intracavity frequency conversion
    red laser
    pulse stretching
    Opis:
    W artykule zaprezentowano opracowany i zbudowany model laboratoryjny lasera Nd:YAG, pracujący na linii 1.32 ?m, z modulacją dobroci i wewnątrzrezonatorową konwersją częstotliwości na drugą harmoniczną. W reżimie "overcouplingu", laser ten pozwalał generować impulsy czerwonego promieniowania o długości fali 0.66 ?m, czasach trwania do 2.8 ?s, maksymalnej energii około 1.1 mJ i częstotliwości repetycji 10 Hz.
    New laboratory model of Q-switched Nd:YAG laser operated at 1.32 ?m, with intra-cavity second harmonic generation is presented in the paper. In the overcoupling regime of SHG, the laser emitted red radiation pulses at wavelength of 0.66 ?m. Pulses with maximum energy of 1.1 mJ and duration up to 2.8 ?s has been achieved.
    Źródło:
    Prace Instytutu Elektrotechniki; 2012, 255; 277-288
    0032-6216
    Pojawia się w:
    Prace Instytutu Elektrotechniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modifying the frictional wear resistance of AISI 316L austenitic steel
    Kształtowanie odporności na zużycie przez tarcie stali austenitycznej typu 316L
    Autorzy:
    Wierzchoń, T.
    Skołek, E.
    Brojanowska, A.
    Burdyńska, S.
    Mróz, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/256664.pdf
    Data publikacji:
    2006
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
    Tematy:
    stal austenityczna 316L
    azotowanie jarzeniowe
    azotek boru
    osadzanie laserem impulsowym
    metoda hybrydowa
    AISI 316L austenitic stainless steel
    glow discharge nitriding
    boron nitride
    pulse laser deposition
    hybrid process
    Opis:
    The rapid technical development enhances the demands on constructional materials in terms of their resistance to frictional wear, resistance to corrosion and erosion, high hardness, etc. These demands can be satisfied by, e.g. applying various surface engineering techniques that permit to modify the microstructure, the phase and chemical composition of the surface layers of the treated parts. A prospective line of the development of surface engineering is the production of composite layers by combining various surface engineering methods. This paper presents the results of examinations of the phase composition and frictional wear resistance of the layers produced by hybrid processes, i.e. such that combine glow discharge assisted nitriding performed at 450°C and 550°C with a pulsed laser deposition of boron nitride coatings (PLD method). It has been shown that the boron nitride coatings formed on nitrided 316L steel increase its frictional wear resistance.
    Procesy azotowania jarzeniowego stali austenitycznych pozwalają na wytworzenie powierzchniowych warstw dyfuzyjnych zwiększających twardość i odporność na zużycie przez tarcie. Prowadzenie tych obróbek w temperaturach powyżej 460°C powoduje jednak spadek odporności korozyjnej stali. W artykule przedstawiono wyniki badań składu fazowego oraz odporności na zużycie przez tarcie warstw wytworzonych w procesach hybrydowych łączących metodę azotowania jarzeniowego w temperaturach 450°C i 550°C z procesem impulsowego laserowego osadzania powłok azotku boru (metoda PLD). Wykazano, że wytworzenie powłok azotku boru na warstwach azotowanych wytworzonych na stali 316L zwiększa ich odporność na zużycie przez tarcie.
    Źródło:
    Problemy Eksploatacji; 2006, 4; 205-213
    1232-9312
    Pojawia się w:
    Problemy Eksploatacji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Compact energy measuring system for short pulse lasers
    Autorzy:
    Barna, A.
    Földes, I. B.
    Gingl, Z.
    Mingesz, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/221220.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    laser energy
    optical fiber
    USB
    peak-hold
    UV short pulse
    open source
    Opis:
    In experiments with short-pulse lasers the measurement control of the energy of the laser pulse is of crucial importance. Generally it is difficult to measure the amplitude of the pulses of short-pulse lasers using electronic devices, their response time being longer than the duration of the laser pulses. The electric response of the detector is still too fast to be directly digitized therefore a peak-hold unit can be used to allow data processing for the computer. In this paper we present a device which measures the energy of UV short (fs) pulses shot-byshot, digitizes and sends the data to the PC across an USB interface. The circuit is based on an analog peak detect and hold unit and the use of fiber optical coupling between the PC and the device provides a significant improvement to eliminate potential ground loops and to reduce conductive and radiated noise as well. The full development is open source and has been made available to download from our web page (http://www.noise.inf.u-szeged.hu/Instruments/PeakHold/).
    Źródło:
    Metrology and Measurement Systems; 2013, 20, 2; 183-190
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental results on advanced inertial fusion schemes obtained within the HiPER project
    Autorzy:
    Batani, D.
    Gizzi, L. A.
    Koester, P.
    Labate, L.
    Honrubia, J.
    Antonelli, L.
    Morace, A.
    Volpe, L.
    Santos, J. J.
    Schurtz, G.
    Hulin, S.
    Ribeyre, X.
    Nicolai, P.
    Vauzour, B.
    Dorchies, F.
    Nazarov, W.
    Pasley, J.
    Richetta, M.
    Lancaster, K.
    Spindloe, Ch.
    Tolley, M.
    Neely, D.
    Kozlová, M.
    Nejdl, J.
    Rus, B.
    Wołowski, J.
    Badziak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147696.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    advanced ignition schemes
    fast ignition
    shock ignition
    inertial fusion
    propagation of fast electrons
    short-pulse ultra-high-intensity laser
    shock compressed matter
    cylindrical implosions
    Opis:
    This paper presents the results of experiments conducted within the Work Package 10 (fusion experimental programme) of the HiPER project. The aim of these experiments was to study the physics relevant for advanced ignition schemes for inertial confinement fusion, i.e. the fast ignition and the shock ignition. Such schemes allow to achieve a higher fusion gain compared to the indirect drive approach adopted in the National Ignition Facility in United States, which is important for the future inertial fusion energy reactors and for realising the inertial fusion with smaller facilities.
    Źródło:
    Nukleonika; 2012, 57, 1; 3-10
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the laser welding process on changes in the magnetic induction of the Religa Heart ROT pump
    Wpływ procesu spawania laserowego na zmiany indukcji magnetycznej wirnika pompy wspomagania serca Religa Heart ROT
    Autorzy:
    Stano, Sebastian
    Kustosz, Roman
    Kapis, Artur
    Kurtyka, Przemysław
    Zalewski, Jerzy
    Zarwańska, Magda
    Powiązania:
    https://bibliotekanauki.pl/articles/115085.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    spawanie laserowe impulsowe
    stop tytanu
    rozkład indukcji magnetycznej
    wirnik pompy
    wspomaganie serca
    pompa Religa Heart ROT
    pulse laser welding
    titanium alloy
    magnetic induction distribution
    pump rotor
    heart assistance
    Religa Heart ROT pump
    Opis:
    The study addresses the results concerning the laser welding technology of the titanium circulatory support blood pump Religa Heart ROT. Pulse laser welding parameters were determined and selected. The influence of the pulse welding parameters and other conditions of welding process on the magnetic induction distribution of the mechanical circulatory support blood pump was investigated.
    W artykule przedstawiono wyniki badań procesu spawania laserowego tytanowego wirnika pompy wspomagania serca Religa Heart ROT. Określono parametry spawania laserowego w trybie impulsowym zapewniające uzyskanie odpowiedniego wtopienia oraz ich wpływ na zmiany indukcyjności magnesów neodymowych znajdujących się wewnątrz wirnika pompy. Opracowano parametry technologiczne spawania laserowego zapewniające brak zmian indukcyjności wirnika pompy po spawaniu.
    Źródło:
    Welding Technology Review; 2019, 91, 4; 39-47
    0033-2364
    2449-7959
    Pojawia się w:
    Welding Technology Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optymalizacja i badania generacyjne glowicy dalmierza laserowego YAG:Nd³⁺ z pasywnym modulatorem dobroci YAG:Cr⁴⁺
    Optimization and generation investigations of a passively q-switched YAG:Nd³⁺/YAG:Cr⁴⁺
    Autorzy:
    Młyńczak, J.
    Kopczyński, K.
    Mierczyk, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/211084.pdf
    Data publikacji:
    2007
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    optymalizacja lasera impulsowego
    generacja impulsów gigantycznych
    optimization of passively q-switched laser
    giant pulse generation
    Opis:
    W pracy przedstawiono optymalizację lasera z pasywnym przełącznikiem dobroci generującego impulsy gigantyczne. Do analizy wykorzystano modele Degnana, Xiao-Bassa oraz Żendziana. Początkowy współczynnik wzmocnienia oraz straty dysypacyjne rezonatora wyznaczono metodą Findley'a-Clay'a. Dokonano analizy procedur optymalizacji lasera z nieliniowym absorberem, uwzględniając ESA. Przedstawiono wyniki badań generacji monoimpulsowej głowicy laserowej, wykazując poprawność zastosowanych modeli optymalizacyjnych.
    The paper presents the results of optimization procedures of a passively q-switched laser. The optimization procedure developed by Degnan, Xiao-Bass and Żendzian were used. Following a method first proposed by Findlay and Clay, small signal gain coefficient and the resonator losses were determined. Taking into account the excited state absorption of the non-linear absorber, the analysis of optimization procedures was carried out. Single-pulse generation was shown proving correctness of the applied procedures.
    Źródło:
    Biuletyn Wojskowej Akademii Technicznej; 2007, 56, 4; 137-154
    1234-5865
    Pojawia się w:
    Biuletyn Wojskowej Akademii Technicznej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electromagnetic pulses produced by expanding laser - produced Au plasma
    Autorzy:
    De Marco, M.
    Cikhardt, J.
    Krása, J.
    Velyhan, A.
    Pfeifer, M.
    Krouský, E.
    Klír, D.
    Řezáč, D.
    Limpouch, J.
    Margarone, D.
    Ullschmied, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147922.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    laser-produced plasma
    electromagnetic pulse (EMP)
    return target current
    Moebius loop antenna
    inductive target probe
    Opis:
    The interaction of an intense laser pulse with a solid target produces large number of fast free electrons. This emission gives rise to two distinct sources of the electromagnetic pulse (EMP): the pulsed return current through the holder of the target and the out flow of electrons into the vacuum. A relation between the characteristics of laser-produced plasma, the target return current and the EMP emission are presented in the case of a massive Au target irradiated with the intensity of up to 3 × 1016 W/cm2. The emission of the EMP was recorded using a 12 cm diameter Moebius loop antennas, and the target return current was measured using a new type of inductive target probe (T-probe). The simultaneous use of the inductive target probe and the Moebius loop antenna represents a new useful way of diagnosing the laser–matter interaction, which was employed to distinguish between laser-generated ion sources driven by low and high contrast laser pulses.
    Źródło:
    Nukleonika; 2015, 60, 2; 239-243
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A diode-pumped high-repetition-frequency passively Q-switched Nd:LaMgAl11O19 laser
    Autorzy:
    Xu, Yan
    Gao, Ziye
    Xia, Guangqiong
    Wu, Zhengmao
    Powiązania:
    https://bibliotekanauki.pl/articles/1835801.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Nd:LaMgAl11O19 disordered crystal
    Q-switched laser
    high pulse repetition frequency
    PRF
    semiconductor saturable absorber mirror
    SESAM
    laser diode
    LD
    Opis:
    High-repetition-frequency Q-switched laser is realized through adopting a Nd:LaMgAl11O19 (Nd:LMA) disordered crystal as the gain material, a laser diode lasing at 796 nm as the pumped source, and a semiconductor saturable absorber mirror (SESAM) as the Q-switched device. The out-put characteristics are analyzed under using different transmittance T plane mirrors as an output coupler. Without adopting SESAM, the laser is operating at a CW state, and a relatively high transmittance is helpful for achieving high output power, slope efficiency and light-to-light efficiency. ForT = 7.5% and an absorbed power of 6.17 W, the output power arrives at its maximum of 1160 mW,and the corresponding slope efficiency and light-to-light efficiency are 20.71% and 18.78%, respectively. After introducing SESAM into the cavity, the laser operates at a passively Q-switched state, and the largest slope efficiency is 13.14% under T = 5.0%. Adopting five different output couplers, with the increase of the absorbed power, the pulse repetition frequencies, the pulse energies and the peak powers will ascend while the pulse widths will decline. The observed narrowest pulse width, the maximum pulse repetition frequency, the highest pulse energy and peak power are 1.745 μs, 175.88 kHz, 3.21 μJ and 1.84 W, respectively.
    Źródło:
    Optica Applicata; 2020, 50, 3; 415-423
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recent upgrading of the nanosecond pulse radiolysis setup and construction of laser flash photolysis setup at the Institute of Nuclear Chemistry and Technology in Warsaw, Poland
    Autorzy:
    Szreder, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2173384.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    computer-controlled systems
    data collection software
    data processing software
    laser flash photolysis
    pulse radiolysis
    time-resolved techniques
    Opis:
    Modification of pulse radiolysis (PR) setup and construction of a new laser flash photolysis (LFP) setup at the Institute of Nuclear Chemistry and Technology (INCT) is described. Both techniques are dedicated to studying fast reactions in real time by direct observation of transients. Time resolution of the PR setup at INCT was ~11 ns, limited by the duration of the electron pulse. Implementation of a new spectrophotometric detection system resulted in a significant broadening of experimental spectral range with respect to the previous setup. Noticeable reduction of the noise-to-signal ratio was also achieved. The LFP system was built from scratch. Its time resolution was ~6 ns, limited by the duration of a laser pulse. LFP and PR were purposely designed to share the same hardware and software solutions. Therefore, components of the detection systems can be transferred between both setups, signifi cantly lowering the costs and shortening the construction/upgrading time. Opened architecture and improved experimental fl exibility of both techniques were accomplished by implementation of Ethernet transmission control protocol/Internet protocol (TCP/IP) communication core and newly designed software. This is one of the most important enhancements. As a result, new experimental modes are available for both techniques, improving the quality and reducing the time of data collections. In addition, both systems are characterized by relatively high redundancy. Currently, implementation of new equipment into the systems hardly ever requires programming. In contrast to the previous setup, daily adaptations of hardware to experimental requirements are possible and relatively easy to perform.
    Źródło:
    Nukleonika; 2022, 67, 3; 49--64
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physicochemical Properties and Laser Initiation of a Copper Perchlorate Complex with 3(5)-Hydrazino-4-amino-1,2,4-triazole (HATr) as a Ligand
    Autorzy:
    Ilyushin, M. A.
    Tselinskiy, I. V.
    Smirnov, A. V.
    Shugalei, I. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/358314.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    IR-laser
    pulse
    ignition
    3(5)-hydrazino-4-amino-1,2,4-triazole (HATr) as a ligand
    light-sensitive explosives
    Opis:
    Several metal perchlorate complexes with 3(5)-hydrazino-4-amino- 1,2,4-triazole as a ligand were investigated. It was shown that the threshold of laser initiation of the copper complex changed under the influence of additives of optically transparent polymers, detonation nanodiamonds or nanotubes.
    Źródło:
    Central European Journal of Energetic Materials; 2012, 9, 1; 3-16
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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