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Wyszukujesz frazę "femtosecond pulses" wg kryterium: Wszystkie pola

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    Wyświetlanie 1-8 z 8
    Tytuł:
    Ultrashort pulses supported by SESAM absorber
    Autorzy:
    Jasik, A.
    Muszalski, J.
    Gaca, J.
    Wójcik, M.
    Pierściński, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/200639.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    DBR
    SESAM
    mode-locking
    femtosecond pulses
    Opis:
    We have developed a mode-locked diode-pumped Yb:KYW laser generating nearly band-width limited pulses as short as 101 fs. At 1.1 W absorbed power and 3% transmission output coupler, the laser delivers 150 mW for pulse duration of 110 fs, what corresponds to an efficiency of 14%. It was achieved using semiconductor saturable absorber mirror (SESAM) grown by molecular beam epitaxy. SESAM contains a distributed Bragg reflector (DBR) completed by single quantum well (SQW) playing role of an absorbing layer. The absorbers were crystallized in accordance with the predicted structure parameters under optimised growth conditions. The resonant-like type of structures ensured relatively high enhancement factor due to antireflective properties of SiO2 capping material and a wavelength independence of a group delay dispersion. The optimisation of the growth conditions of both an absorbing layer and DBR structure were widely carried out. Optical reflectance and high resolution X-ray diffraction have been used for characterization and verification of DBR structures. It results in reduction of the nonsaturable absorption in SESAM and self-starting mode-locking of the ultrashort pulses.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2010, 58, 4; 477-483
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theory of Ultrafast Demagnetization after Femtosecond Laser Pulses
    Autorzy:
    Fähnle, M.
    Illg, Ch.
    Haag, M.
    Teeny, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1384049.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.78.Jp
    75.30.Ds
    75.40.Gb
    Opis:
    Experimentally it has been found that a ferromagnetic metallic film is strongly demagnetized within few hundred fs after exposure to a fs laser pulse. The theories of this ultrafast demagnetization are reviewed, especially the influence of scatterings of the excited electrons at phonons and at magnons. The calculations for phonons and magnons are performed by the ab initio spin-density-functional electron theory for Ni and Fe, and they are based on Fermi's golden rule for transition rates. The application of this rule on the fs time scale is critically discussed in view of results from quantum-kinetic density-matrix calculations. It is shown that the experimentally observed demagnetization rates cannot be explained by spin-flip scatterings of electrons exclusively at phonons or exclusively at magnons. A combination of individual spin-flip electron-phonon and spin-flip electron-magnon processes is shown to be a potential candidate for the explanation of ultrafast demagnetization.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 170-175
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High Power Laser Laboratory at the Institute of Plasma Physics and Laser Microfusion : equipment and preliminary research
    Autorzy:
    Zaraś-Szydłowska, A.
    Badziak, J.
    Rosiński, M.
    Makowski, J.
    Parys, P.
    Piotrowski, M.
    Ryć, L.
    Wołowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/146603.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    femtosecond pulses
    high-power laser
    inertial confinement fusion
    laser plasma
    Opis:
    The purpose of this paper is to present the newly-opened High Power Laser Laboratory (HPLL) at the Institute of Plasma Physics and Laser Microfusion (IPPLM). This article describes the laser, the main laboratory accessories and the diagnostic instruments. We also present preliminary results of the first experiment on ion and X-ray generation from laser-produced plasma that has been already performed at the HPLL.
    Źródło:
    Nukleonika; 2015, 60, 2; 245-248
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adaptive Optical Delay Lines for Femtosecond Laser Pulses Shaping
    Autorzy:
    Molchanov, V.
    Chizhikov, S.
    Makarov, O.
    Solodovnikov, N.
    Ginzburg, V.
    Katin, E.
    Khazanov, E.
    Lozhkarev, V.
    Yakovlev, I.
    Epatko, I.
    Serov, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807737.pdf
    Data publikacji:
    2009-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.Re
    42.79.Jq
    43.38.Zp
    Opis:
    The paper is devoted to investigation of adaptive optical delay lines, intended for femtosecond pulse shaping. Experiments were performed in the sub PW laser system, based on optical parametrical chirped pulse amplification. The experimental device has revealed high spectral resolution (0.6 nm at 1250 nm) high efficiency, (70% over a 120 nm spectral width at 1250 nm) and flexibility of seed pulse amplitude control. Proper shaping of the transmission function of adaptive optical delay line allows to double the femtosecond pulse spectrum band width.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 3; 355-358
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Terahertz Emission from Narrow Gap Semiconductors Photoexcited by Femtosecond Laser Pulses
    Autorzy:
    Adomavičius, R.
    Urbanowicz, A.
    Molis, G.
    Krotkus, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2041649.pdf
    Data publikacji:
    2005-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.Re
    07.57.Hm
    78.47.+p
    72.30.+q
    Opis:
    Large increase in the emitted terahertz power was observed for p-InAs samples with the p-doping levels of approximately 10$\text{}^{16}$-10$\text{}^{17}$ cm$\text{}^{-3}$. This increase was explained by a large surface depletion layer and an electric-field-induced optical rectification effect in the layer. Terahertz fields radiated by the samples of all three investigated Cd$\text{}_{x}$Hg$\text{}_{1-x}$Te layers was of the same order of magnitude. No azimuthal angle dependence of the radiated signal was detected, which evidences that linear current surge effect is dominating over nonlinear optical rectification. Azimuthal angle and magnetic fields emission witness that it is caused by linear photo-Dember type processes.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 1; 132-136
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bleaching and Darkening Effect in Photochromic Glasses under Irradiation with Femtosecond Laser Pulses
    Autorzy:
    Jamshidi-Ghaleh, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791201.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.80.Wz
    78.20.Ci
    Opis:
    In this paper, the photochromic oxide glass sample under interaction of 200 fs laser pulses at 800 nm wavelength is studied. Two types of laser-induced modifications, bleaching and darkening, are observed. The induced darkening is observed inside the bleached volume. The effect of incident laser shot number and pulse energy on the bleached and darkened area are investigated. The pulse energy accumulation model is applied to investigation of both bleached and darkened area sizes. The bleaching and darkening modification fluence threshold are determined for single and multi-shot laser pulses.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 501-503
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nonlinear Responses and Optical Properties Modification οf SK3 under Irradiation of Femtosecond Laser Pulses
    Autorzy:
    Jamshidi-Ghaleh, K.
    Rezapour, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1795599.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.80.Wz
    78.20.Ci
    Opis:
    In this paper, the nonlinear responses and optical properties modification in SK3 glass sample are investigated. The nonlinear responses measurements were performed by using of nonlinear transmission monitoring of 200 fs at 800 nm laser pulses. The optical power limiting threshold of the sample is measured to be about 40 mJ/$cm^{2}$. The decrease of transmitted intensity is about 63% compared to the theoretical linear transmission at 270 mJ/$cm^{2}$ incident pulse energy. For prediction of the experimental nonlinear behavior results, a theoretical model based on three-photon absorption and absorption of free carriers is presented. By fitting of experimental data with theoretical model, three-photon absorption coefficient and free-carrier absorption cross-section are reported. The photo-induced optical properties modification of the SK3 sample is investigated also. The modifications that appear as darkening are observed below breakdown threshold intensity. To analyses of modified region sizes, the laser pulse energy accumulation model is applied.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 588-591
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New pico- and femtosecond laser based sources: from the Infra-Red to the XUV
    Autorzy:
    Petite, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/308713.pdf
    Data publikacji:
    2000
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    lasers
    short pulses
    ultrafast phenomena
    Opis:
    In this paper, we review a number of recent developments concerning laser or laser-based sources generating pico- or subpicosecond pulses of light at wavelengths now ranging from the mid Infra-Red (50 ľm) to the XUV (11,9 nm). Those include the new generation of 'Chirp Pulse Amplification' laser systems, Free Electron Lasers operating in the IR or visible range, and a number of laser driven sources covering the XUV range, and a number of laser driven sources covering the XUV range, generally based on the high intensity irradiation of solid or gaseous targets. The main perspectives, applications and essential issues concerning such sources are discussed.
    Źródło:
    Journal of Telecommunications and Information Technology; 2000, 1-2; 6-15
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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