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    Wyświetlanie 1-6 z 6
    Tytuł:
    Investigations and Comparisons of Active Q-Switching Laser Performances of Composite and Conventional Nd:$YVO_4$ Crystals with Electro-Optic Modulator
    Autorzy:
    Li, Shixia
    Li, Yufei
    Zhao, Shengzhi
    Li, Guiqiu
    Wang, Xiaomei
    Yang, Kejian
    Li, Tao
    Li, Dechun
    Powiązania:
    https://bibliotekanauki.pl/articles/1398735.pdf
    Data publikacji:
    2015-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.55.Xi
    42.60.Gd
    Opis:
    Actively Q-switched laser performances of composite and conventional Nd:$YVO_4$ crystals were investigated and compared with different Nd-doped concentrations of laser media and different repetition rates of electro-optic modulator. Both continuous-wave and actively Q-switched operations were realized experimentally. At an incident pump power of 7.69 W, the shortest pulse duration of 6.5 ns was obtained by the composite Nd(0.1 at.%):$YVO_4$/Nd(0.3 at.%):$YVO_4$/Nd(0.8 at.%):$YVO_4$ crystal at the repetition rate f=2 kHz. However, the composite Nd(0.1 at.%):$YVO_4$/Nd(0.5 at.%):$YVO_4$/Nd(1.0 at.%):$YVO_4$ laser achieved the maximum average output power of 687 mW at f=10 kHz and the largest single pulse energy of 144 μ J at f=2 kHz. Power saturation of the conventional Nd:$YVO_4$ crystal was shown during experiment, while no power saturation was observed on the composite Nd:$YVO_4$crystals, showing good thermo-mechanical performances.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 3; 711-714
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Asymmetry and Contradiction of Mirror Misalignments Influence of Off-Axial Cylindrical Hybrid Resonator
    Autorzy:
    Wang, N.
    Li, X.
    Zhu, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399267.pdf
    Data publikacji:
    2013-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.55.Xi
    42.60.Da
    42.60.Jf
    Opis:
    The output far-field intensity distributions of off-axial cylindrical hybrid resonator with different mirror misalignments are simulated by coordinate transformation fast Fourier-transform algorithm. The simulations showed that the mirror misalignments influence is different in anticlockwise and clockwise tilt direction. According to the calculation results, the output beam quality of off-axial unstable resonator is analyzed, from the aspects of $M^2$ value and power in the bucket curves. Furthermore, the analysis brings out an interesting contradiction that the beam quality changing evaluated by $M^2$ value is different from that by power in the bucket curves when the mirror misalignments occurred in anticlockwise direction. It demonstrated that the beam quality evaluation of off-axial unstable resonator should not be one-sided.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 4; 661-664
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Monte Carlo Least-Squares Fitting of the Beam Propagation Factor $M^{2}$
    Autorzy:
    Alsous, M.
    Almezel, M.
    Alnezami, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399271.pdf
    Data publikacji:
    2013-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.60.Jf
    42.55.Xi
    Opis:
    A new method for $M^2$ least-squares fitting using Monte Carlo technique is introduced. The laser beam parameters and the propagation factor $M^2$ are calculated according to the ISO 11146. The initial values of the fitted parameters are analytically calculated and simple relations are given. These relations use three experimental points of the laser beam at different positions. The Monte Carlo fitting algorithm converged rapidly for all the tested beam. The $M^2$ value of a diode pumped Nd:YVO_4 laser was optimized. The best $M^2$ value was 1.08. This optimization was done by changing the pump spot size at the laser crystal. The best overlapping between the pump spot size and the $TEM_{00}$ mode dimension resulted in the best $M^2$ value.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 4; 673-676
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Analytical Calculation of Temperature-Dependent Propagation Constant, V No. and Waveguide Dispersion in Super-Gaussian Diode-Pumped Fiber Lasers
    Autorzy:
    Elahi, P.
    Niakowsari, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791214.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.55.Wd
    42.55.Xi
    Opis:
    In this paper, the dependence of some important parameters in fiber lasers such as propagation constant, normalized frequency or V No. and waveguide dispersion with temperature has been investigated analytically. We showed that the thermal effects cannot be neglected in the above parameters especially in middle and high power regime.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 525-527
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Analytical Solution of Rate Equations in End-Pumped Fiber Lasers with Minimum Approximation and Temperature Distribution during the Laser Operation
    Autorzy:
    Elahi, P.
    Zare, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791213.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.55.Wd
    42.55.Xi
    Opis:
    In this paper, as the first the rate equations in end-pumped fiber laser have been solved analytically with minimum approximation and the output power versus input power has been derived. Then, the heat conduction equation in the fiber which is in operation has been solved and the temperature distribution has been derived. The results were applied for a Yb-doped fiber laser and discussed.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 522-524
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Angular and Temperature Tuning of Emission from Vertical-External-Cavity Surface-Emitting Lasers (VECSELs)
    Autorzy:
    Wójcik-Jedlińska, A.
    Muszalski, J.
    Bugajski, M.
    Łukowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812025.pdf
    Data publikacji:
    2008-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.55.Px
    85.35.Be
    78.67.De
    42.55.Sa
    42.55.Xi
    Opis:
    In this paper we demonstrate how the tuning of the VECSEL heterostructure can be precisely determined. Since the VECSEL active region is embodied in a microcavity, the photoluminescence signal collected from the chip surface is modified by the resonance of this cavity. The angle resolved photoluminescence measurements combined with the temperature tuning of the structure allowed us to precisely determine VECSEL emission features. The investigated structure consists of GaAs cavity with six InGaAs quantum wells and is designed for lasing at 980 nm.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 5; 1437-1443
    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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