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    Wyświetlanie 1-6 z 6
    Tytuł:
    Material Parameters Characterizing the Performance of Flashlamp Pumped BaLa$\text{}_{1-x}$Nd$\text{}_{x}$Ga$\text{}_{3}$O$\text{}_{7}$ Laser
    Autorzy:
    Ryba-Romanowski, W.
    Gołąb, S.
    Berkowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1887344.pdf
    Data publikacji:
    1991-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.60.-b
    Opis:
    Physical properties of optically uniaxial BaLa$\text{}_{1-x}$Nd$\text{}_{x}$Ga$\text{}_{3}$O$\text{}_{7}$ crystals have been investigated. Specific heat, thermal expansion coefficients, thermal diffusivity, Young modules and Poisson ratios of the crystal have been determined. Basing upon these parameters and the available spectral data the operating conditions for lasers employing rods made of BaLa$\text{}_{1-x}$Nd$\text{}_{x}$Ga$\text{}_{3}$O$\text{}_{7}$ have been defined.
    Źródło:
    Acta Physica Polonica A; 1991, 79, 4; 501-506
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adiabatic Processes in Quantum Optics
    Autorzy:
    Stenholm, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2030475.pdf
    Data publikacji:
    2002-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.75.-b
    42.60.Da
    05.60.Gg
    03.65.Ge
    Opis:
    This paper reviews the use of adiabatic approximations in quantum optics.The general principle is explained in terms of the Landau-Zener model and the recently developed stimulated Raman adiabatic passage scheme. The features characteristic of adiabatic evolution are extracted from these examples. Our recent work on adiabatic level preparation and cavity mode transfer of excitation is presented and discussed.
    Źródło:
    Acta Physica Polonica A; 2002, 101, 3; 425-435
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Intrinsic Luminescence of the Undoped Glasses of (CaO-Ga$\text{}_{2}$O$\text{}_{3}$-GeO$\text{}_{2}$) System
    Autorzy:
    Padlyak, B. V.
    Bordun, O. M.
    Buchynskii, P. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2010938.pdf
    Data publikacji:
    1999-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.Ce
    78.60.-b
    76.30.Mi
    Opis:
    For the first time the intrinsic luminescence in the undoped (CaO-Ga$\text{}_{2}$O$\text{}_{3}$-GeO$\text{}_{2}$) glasses with different composition has been found and investigated in the 80÷300 K temperature range. The new glasses of high chemical purity and optical quality with stoichiometric composition similar to that in calcium-gallium- germanium garnet (Ca$\text{}_{3}$Ga$\text{}_{2}$Ge$\text{}_{3}$O$\text{}_{12}$), trigonal Ca-gallogermanate (Ca$\text{}_{3}$Ga$\text{}_{2}$Ge$\text{}_{4}$O$\text{}_{14}$), and Ca$\text{}_{3}$Ga$\text{}_{2}$O$\text{}_{6}$ crystals were obtained by the high-temperature synthesis method. The luminescence and photoexcitation spectra analysis, supported by EPR spectroscopy data, yields the following results: (i) the UV-excited non-elementary broad emission band with maxima at roughly 500 nm and 420 nm in the (CaO-Ga$\text{}_{2}$O$\text{}_{3}$-GeO$\text{}_{2}$) glasses is due to recombination of ensemble of the transient hole O$\text{}^{-}$ centres; (ii) the emission bands with maxima at nearly 380 and 710 nm, which were distinctly revealed in glasses with the Ca$\text{}_{3}$Ga$\text{}_{2}$Ge$\text{}_{4}$O$\text{}_{14}$ and Ca$\text{}_{3}$Ga$\text{}_{2}$O$\text{}_{6}$ compositions, are assigned to the luminescence of UV-induced electron centres of two different types. Possible models of the luminescence centres in (CaO-Ga$\text{}_{2}$O$\text{}_{3}$-GeO$\text{}_{2}$) glass network are discussed.
    Źródło:
    Acta Physica Polonica A; 1999, 95, 6; 921-929
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improved Nucleation and Transition by Plasma Treatments for Fast Response Optically-Compensated-Bend Displays
    Autorzy:
    Wu, G.
    Huang, C.
    Chien, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400462.pdf
    Data publikacji:
    2013-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.77.-j
    81.65.-b
    42.79.Kr
    64.60.Q-
    Opis:
    The optically-compensated-bend mode pi-cell displays exhibit fast-response time and wide-viewing angle characteristics. However, it requires a transition of the liquid crystal molecule from an initial splay state to the bend state configuration before providing the quick operation. A high voltage and a long warm-up time are needed to transform to the bend state. In this paper, the polyimide alignment films have been modified to reduce the splay-to-bend transition time by plasma beam treatments. The proposed method was demonstrated to be highly effective in improving the overall transition time. The number of splay-to-bend nucleation sites in the assembled liquid crystal cells could be increased dramatically by up to 20 times at the initial stage, and the improvement in the cell warm-up time was achieved at 45-71% reduction at 5.5 V. The plasma processing parameters were optimized at the plasma power of 700 W, the plasma distance of 25 mm, and the plasma scan speed of 600 mm/s. In addition, we maintained the excellent optical properties and response time characteristics for the optically-compensated-bend mode liquid crystal displays.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 5; 892-895
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular Beam Epitaxy Growth for Quantum Cascade Lasers
    Autorzy:
    Kosiel, K.
    Szerling, A.
    Kubacka-Traczyk, J.
    Karbownik, P.
    Pruszyńska-Karbownik, E.
    Bugajski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791281.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.55.Px
    81.15.Hi
    85.60.-q
    85.35.Be
    73.63.-b
    63.22.-m
    72.80.Ey
    73.61.Ey
    78.66.Fd
    Opis:
    The fabrication of quantum cascade lasers emitting at 9 μm is reported. The devices operated in pulsed mode at up to 260 K. The peak powers recorded at 77 K were over 1 W and the slope efficiency η ≈ 0.5-0.6 W/A per uncoated facet. This has been achieved by the use of GaAs/$Al_{0.45}Ga_{0.55}As$ heterostructure, with the "anticrossed-diagonal" design. Double plasmon planar confinement with Al-free waveguide has been used to minimize absorption losses. The double trench lasers were fabricated using standard processing technology, i.e., wet etching and $Si_{3}N_{4}$ for electrical insulation. The quantum cascade laser structures have been grown by molecular beam epitaxy, with Riber Compact 21 T reactor. The stringent requirements - placed particularly on the epitaxial technology - and the influence of technological conditions on the device structure properties were presented and discussed in depth.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 806-813
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Luminescence of Lanthanides from Xerogels Embedded in Mesoporous Matrices
    Autorzy:
    Gaponenko, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1814047.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.20.Fw
    83.80.Jx
    81.05.Rm
    78.55.Mb
    61.43.Gt
    82.45.Cc
    42.70.Qs
    78.55.Ap
    78.60.-b
    Opis:
    The report summarizes peculiarities of synthesis and luminescence properties of porous silicon, porous anodic alumina and artificial opals with the inclusions of sol-gel derived oxides (xerogels), doped with Er, Tb, and Eu. Origin of strong luminescence of lanthanides from xerogels in mesoporous matrices is discussed.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 737-749
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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