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    Wyświetlanie 1-11 z 11
    Tytuł:
    Physics of Solid-State Laser Materials
    Autorzy:
    Wojtowicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1888052.pdf
    Data publikacji:
    1991-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.55.Rz
    78.50.-w
    78.55.-m
    Opis:
    A survey of the physical properties of solid state materials activated with d$\text{}^{2}$, d$\text{}^{3}$ and d$\text{}^{8}$ transition metal ions is presented in the context of tunable laser operation. An emphasis is put on common characteristics of all three systems, like a strong electron-phonon coupling and similar electronic structures. The conditions necessary to obtain a tunable operation and to avoid an overlap of the excited state absorption and emission are formulated. It is shown that the d$\text{}^{3}$ configuration system has the largest range of allowed values of the crystal field parameter 10Dq.
    Źródło:
    Acta Physica Polonica A; 1991, 80, 2; 193-205
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stable LiF:F$\text{}_{2}^{+}$ Color Center Laser Oscillation at Room Temperature
    Autorzy:
    Tsuboi, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1992789.pdf
    Data publikacji:
    1998-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.55.Rz
    78.55.Fv
    Opis:
    An LiF:F$\text{}_{2}^{+}$ color center laser using a two-mirror cavity is reported. The LiF:F$\text{}_{2}^{+}$ laser was achieved by creating the F$\text{}_{2}^{+}$ centers through the photoionization of the F$\text{}_{2}$ color centers at room temperature and simultaneously by exciting the F$\text{}_{2}^{+}$ centers optically. We obtained the F$\text{}_{2}^{+}$ broadband laser oscillation with a peak at 930 nm, and it was more powerful than the room-temperature broadband LiF:F$\text{}_{3}^{+}$ color center laser.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 5-6; 773-778
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nonlinear Upconversion-Rate in Er-Doped Fibers
    Autorzy:
    Jaskorzyńska, B.
    Sergeyev, S.
    Świłło, M.
    Khoptyar, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2015114.pdf
    Data publikacji:
    2001-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.20.Bh
    78.55.-m
    42.55.Rz
    Opis:
    Energy transfer between excited rare-earth ions has been widely used for realizing upconversion lasers and also recognized as a gain limiting factor in high-concentration Er-doped amplifiers. The energy transfer leads to upconversion of the excitation which for randomly distributed (not clustered) ions is called homogeneous upconversion. It was commonly assumed that the rate of homogeneous upconversion is a linear function of the population inversion N$\text{}_{2}$. However, recently published Monte Carlo simulations predict that the homogeneous upconversion rate is a nonlinear function of N$\text{}_{2}$ and that it, moreover, depends on the pump and signals rates. In this paper we review some of our experimental results confirming those predictions. We also propose a statistical, analytical model describing the observed homogeneous upconversion behavior in Er-doped fibers.
    Źródło:
    Acta Physica Polonica A; 2001, 99, 1; 147-153
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling of Passively Synchronized Dual Wavelength Q-Switched rm $Nd^{3+}:YVO_4$ Lasers
    Autorzy:
    Abdul Ghani, B.
    Hammadi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419741.pdf
    Data publikacji:
    2012-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.55.Rz
    42.60.Gd
    87.19.lm
    Opis:
    A mathematical model describing the sum frequency generation of passively synchronized Q-switched pulses simultaneously emitted from two separate $Nd^{3+}:YVO_4$ lasers has been demonstrated. This model describes the temporal behavior of the output pulses, and studies the impact of the pumping energy variation on the characteristics of these pulses (output power, pulse separation, pulse widths, delay time). $V^{3+}:YAG$ and $Cr^{4+}:YAG$ saturable absorbers and a periodically poled KTP crystal are used to achieve and improve the synchronization of the emitted 1342 nm and 1064 nm wavelengths. The synchronization process generates pulsed yellow light with 593.5 nm wavelength, and it can be realized through adjusting the pumping energy of the gain media.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 1; 103-108
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical Study of Diode Pumped Intracavity Doubled Passively Q-Switched Solid-State Lasers
    Autorzy:
    Alshikh Khalil, M.
    Abbas, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812353.pdf
    Data publikacji:
    2008-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.Ky
    42.55.Rz
    42.60.Gd
    02.60.Cb
    Opis:
    In this paper, some designed curves such as peak power, energy, pulse width, and a factor describing the pulse symmetry are generated. With these curves and expressions, one can design a passively Q-switched intracavity frequency-doubled laser and predict the pulse characteristics.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 6; 1639-1646
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling the Dynamic Emission of a Polarized $Cr^{4+}:YAG$ Crystal Investigated by Double-Pulse Pumping Generated by a Nd-Laser
    Autorzy:
    Ghani, B.
    Hammadi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1808015.pdf
    Data publikacji:
    2009-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.55.Rz
    42.50.-p
    Opis:
    A mathematical model describing the dynamic emission of intracavity polarized isotropic $Cr^{4+}:YAG$ solid-state saturable absorber was developed. This model considers double pumping laser pulses to simulate the actions of $Cr^{4+}:YAG$ as a dual Q-switched crystal (1.06 μm) and lasing medium (1.4 μm). The model describes the time evolution of interaction between the pumping laser pulse, partial polarizer and the polarized saturable absorber. The analysis of the polarization process is based on the assumption that at each moment of lasing evolution, the state of polarization represented by an eigenstate corresponds to the lowest radiation losses state. The model offers a simple mechanism for studying the kinetics of the pulsed lasers and the influence of the variations of the pumping laser power and nonlinear anisotropy parameter on the characteristics of the output laser pulses 1.06 μm and 1.4 μm. The angular rotation of the passive switch $Cr^{4+}:YAG$ reveals that the transmission of the polarized 1.06 μm laser radiation is strongly anisotropic in the saturation regime. The suggested model estimates the transmission of pumping laser density of the polarized light 1.06 μm radiation as a function of nonlinear anisotropy parameter, temporal behavior of the relative population inversion of Nd-laser, population inversion of the different polarized levels of $Cr^{4+}:YAG$ pulsed laser and the output laser pulse densities under impact of different values of the nonlinear anisotropy which is due to the self-induced anisotropy of its saturated absorption.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 5; 873-879
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of the Output Pulses of a Simultaneous Q-Switched and Mode-Locked Intracavity Frequency-Doubled Diode-Pumped Pulsed $Nd^{3+}$-Laser
    Autorzy:
    Abdul Ghani, B.
    Hammadi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419732.pdf
    Data publikacji:
    2012-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.55.Px
    42.55.Rz
    42.68.Mj
    Opis:
    A mathematical model for describing the polarization effect of the intracavity frequency-doubling of a simultaneous passively Q-switched and mode-locked diode-pumped $Nd^{3+}$-laser has been demonstrated. The generated polarized waves are assumed to be fixed through the lasing cycle. The maximum absorber initial transmission and the minimum mirror reflectivity values have been determined from the second threshold criterion. The calculated numerical results demonstrate the impact of the variation of the input laser parameters on the characteristics of the output laser pulses. The calculated results are in good agreement with the available experimental data reported in references.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 1; 85-89
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optically Pumped Mid-Infrared Stimulated Emission of ZnSe:Cr Crystals
    Autorzy:
    Ivanov, V. Yu.
    Godlewski, M.
    Szczerbakow, A.
    Omel'chuk, A.
    Davydov, A.
    Zhavoronkov, N.
    Raciukaitis, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038096.pdf
    Data publikacji:
    2004-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.55.Px
    42.55.Rz
    42.62.Be
    78.55.Et
    Opis:
    We demonstrate that ZnSe:Cr is an excellent solid state laser material for mid-infrared region with a broad amplification band from 2.2 μm to 3 μm, and with a high quantum efficiency of a radiative recombination. 46% external total efficiency and 56 mW threshold power were achieved, when pumped with a CW YAlO:Ho laser at resonant excitation conditions. Such laser system can have widespread applications in medicine as laser scalpels with regulated cutting depth. We further demonstrate a stimulated emission under Cr2+ to 1+ photo-ionization pumping. The latter opens chances for laser emission under carrier injection conditions.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 6; 553-558
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Various Impurities on the Optical Properties of YbF$\text{}_{3}$-Doped CaF$\text{}_{2}$ Crystals
    Autorzy:
    Stef, M.
    Pruna, A.
    Pecingina-Garjoaba, N.
    Nicoara, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047870.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.25.Os
    76.30.Kg
    87.64.kv
    42.55.Rz
    Opis:
    Calcium fluoride crystals doped with YbF$\text{}_{3}$ and co-doped with LiF and NaF were grown using the vertical Bridgman method. Several of rare-earth ions (such as Eu, Sm, Ho, Tm, and Yb) can be stabilized in the divalent state in the CaF$\text{}_{2}$. The change of valence was attained by various methods. The optical absorption spectra reveal the characteristic absorption bands of the Yb$\text{}^{3+}$ and Yb$\text{}^{2+}$ ions. This means that the developed crystal growth process achieves a good Yb$\text{}^{3+}$ to Yb$\text{}^{2+}$ conversion in the as-grown crystals. The influence of other impurities, such as Na$\text{}^{+}$ or Li$\text{}^{+}$, on the absorption and emission spectrum of YbF$\text{}_{3}$-doped CaF$\text{}_{2}$ was studied. The Li$\text{}^{+}$ and Na$\text{}^{+}$ ions drastically decrease the absorption coefficient of the Yb$\text{}^{2+}$ ions in the UV band and the emission intensity by excitation in 230 nm.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 1007-1012
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analyzing the Intracavity Frequency Doubling of the Simultaneous Q-Switched Mode-Locked Diode-Pumped Pulsed $Nd^{3+}$ Laser with $Cr^{4+}$:YAG as a Polarized Saturable Absorber
    Autorzy:
    Abdul Ghani, B.
    Hammadi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1504608.pdf
    Data publikacji:
    2011-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.55.Px
    42.55.Rz
    42.68.Mj
    Opis:
    The intracavity frequency doubling of a simultaneous passively Q-switched mode-locked diode-pumped $Nd^{3+}$ laser is studied with a polarized isotropic $Cr^{4+}$:YAG saturable absorber. A general recurrence formula for the mode-locked pulses under the Q-switched envelope at a fundamental wavelength has been reconstructed in order to analyze the temporal shape behaviour of a single Q-switched envelope with mode-locking pulse trains. This formula has been derived taking into account the impact of the intracavity frequency doubling and polarized $Cr^{4+}:YAG$ saturable absorber (the Fresnel losses). The presented mathematical model essentially describes the self-induced anisotropy appearing in the polarized $Cr^{4+}:YAG$ in the nonlinear stage of the giant pulse formation. For the anisotropic $Nd^{3+}:YVO_4$ active medium, the generated polarized waves are fixed through the lasing cycle. Second harmonic peak power, pulse width, pulse duration, shift pulse position of central mode and rotational angle as a function of the absorber initial transmission are estimated. The calculated numerical results are in good qualitative and quantitative agreement with the available experimental data reported in references.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 6; 792-797
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Czochralski Growth and Optical Properties οf $(Lu_{x}Gd_{1-x})_2SiO_5$ Solid Solution Crystals Single Doped with $Sm^{3+}$ and $~Dy^{3+}$
    Autorzy:
    Ryba-Romanowski, W.
    Strzęp, A.
    Głowacki, M.
    Lisiecki, R.
    Solarz, P.
    Domagala, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399472.pdf
    Data publikacji:
    2013-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.55.Rz
    42.70.Hj
    78.40.-q
    78.55.Fv
    Opis:
    Solid solution crystals $(Lu_{x}Gd_{1-x})_2SiO_5$ single doped with $Sm^{3+}$ and $Dy^{3+}$ were grown by the Czochralski method. Segregation coefficients Lu/Gd, melting temperatures and structures of solid solution crystals were determined for 0.15 ≤ x ≤ 0.8. It was found that for x ≥ 0.17 the crystals belong to the monoclinic system within a space group C2/c and their melting temperature diminishes monotonously from 1990C to 1780C when x decreases from 0.8 to 0.15. Disparity of ionic radii of $Lu^{3+}$ and $Gd^{3+}$ induces structural disorder that brings about an inhomogeneous broadening of spectral lines in absorption and emission spectra of incorporated luminescent $Sm^{3+}$ and $Dy^{3+}$ ions. Optical properties of obtained crystals were determined based on results of measurement of absorption and emission spectra and luminescence decay curves. Spectroscopic investigation revealed that $Sm^{3+}$ doped crystals show intense emission distributed in the visible-near infrared region with the most intense band centred at 605 nm and characterized by a branching ratio of 0.43. Emission spectrum of $Dy^{3+}$ doped crystals is dominated by a band centred at 575 nm and characterized by a branching ratio of 0.58. It has been concluded that the systems under study are potential laser materials able to generate visible emission upon GaN/InGaN laser diode pumping.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 2; 321-328
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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