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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:
Influence of Temperature on Refractive Indices of BaLaGa$\text{}_{3}$O$\text{}_{7}$ and SrLaGa$\text{}_{3}$O$\text{}_{7}$
Autorzy:
Ryba-Romanowski, W.
Gołąb, S.
Berkowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1928265.pdf
Data publikacji:
1993-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.-a
Opis:
A simple theoretical approach based on Kramers-Krönig relations predicts well the dispersion and birefringence of BaLaGa$\text{}_{3}$O$\text{}_{7}$ and SrLaGa$\text{}_{3}$O$\text{}_{7}$. In the whole transparency region the birefringence of both compounds is too low to offset dispersion in the process of a second harmonic generation, thus the crystals cannot be made phase matchable. Birefringence of BaLaGa$\text{}_{3}$O$\text{}_{7}$ and SrLaGa$\text{}_{3}$O$\text{}_{7}$ is stable with respect to the temperature region of 300-550 K. The refractive indices increase linearly at a rate of 2 × 10$\text{}^{-5}$ K$\text{}^{-1}$ with increasing temperature.
Źródło:
Acta Physica Polonica A; 1993, 83, 2; 167-172
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relaxation of the $\text{}^{4}$S$\text{}_{3}\text{}_{/}\text{}_{2}$ Level of Er$\text{}^{3+}$ in Cs$\text{}_{2}$NaErCl$\text{}_{6}$
Autorzy:
Dominiak-Dzik, G.
Gołąb, S.
Ryba-Romanowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/1929800.pdf
Data publikacji:
1993-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Hx
Opis:
Octahedral (O$\text{}_{h}$) symmetry of the RE$\text{}^{3+}$ sites in the Cs$\text{}_{2}$NaRECl$\text{}_{6}$ crystals removes all of the electric dipole intensity from the 4f-4f transitions. Thus the decay of luminescence originating in the excited states of RE ions is governed by phonon assisted (vibronic) transitions, multiphonon relaxation and phonon assisted energy transfer (cross relaxation and energy migration to impurities). Contribution of these processes to the decay of the $\text{}^{4}$S$\text{}_{3}\text{}_{/}\text{}_{2}$ state of erbium in Cs$\text{}_{2}$NaErCl$\text{}_{6}$ has been studied in the 4.2-300 K temperature region. It has been concluded that at low temperatures the $\text{}^{4}$S$\text{}_{3}\text{}_{/}\text{}_{2}$ state decays exclusively by vibronic transitions. At about 100 K the cross relaxation via the $\text{}^{4}$I$\text{}_{9}\text{}_{/}\text{}_{2}$ state becomes operative. Efficiency of this process grows strongly with increasing temperature, reducing the $\text{}^{4}$S$\text{}_{3}\text{}_{/}\text{}_{2}$ lifetime by almost three orders of magnitude. No evidence has been found that multiphonon relaxations contribute to the decay of the $\text{}^{4}$S$\text{}_{3}\text{}_{/}\text{}_{2}$ state.
Źródło:
Acta Physica Polonica A; 1993, 84, 5; 941-944
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Study of SrLaGaO$\text{}_{4}$ and SrLaGa$\text{}_{3}$O$\text{}_{7}$ Doped with Nd$\text{}^{3+}$ and Yb$\text{}^{3+}$
Autorzy:
Ryba-Romanowski, W.
Gołąb, S.
Pisarski, W.
Dominiak-Dzik, G.
Gloubokov, A.
Powiązania:
https://bibliotekanauki.pl/articles/1945654.pdf
Data publikacji:
1996-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Hx
42.70.Hj
Opis:
Single crystals of SrLaGaO$\text{}_{4}$ and SrLaGa$\text{}_{3}$O$\text{}_{7}$ singly doped with Nd and codoped with Nd and Yb have been grown by the Czochralski method. Both the compounds form tetragonal crystals but belong to different space groups. A common feature of these matrices is a structural disorder resulting from statistical distribution of Sr$\text{}^{2+}$ and La$\text{}^{3+}$ ions over the lattice sites. A previous investigation of a laser diode pumped SrLaGa$\text{}_{3}$O$\text{}_{7}$:Nd laser revealed that inhomogeneous broadening of spectral lines of Nd$\text{}^{3+}$ was advantageous for optical pumping and did not influence adversely the extraction efficiency. The present paper deals mainly with optical properties of Yb$\text{}^{3+}$ ions which are of interest for the design of lasers pumped by a diode laser and operating near 1 μm.
Źródło:
Acta Physica Polonica A; 1996, 90, 2; 399-405
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of As Grown and Induced Structural Defects in SrLaXO$\text{}_{4}$ (x = Al, Ga) Crystals
Autorzy:
Ryba-Romanowski, W.
Gołąb, S.
Dereń, P.
Dominiak-Dzik, G.
Pisarski, W.
Gloubokov, A.
Powiązania:
https://bibliotekanauki.pl/articles/1964366.pdf
Data publikacji:
1997-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Hx
42.70.Hj
Opis:
SrLaGaO$\text{}_{4}$ and SrLaAlO$\text{}_{4}$ substrates grown by the Czochralski method have no twins or subgrains however they show strong tendency to form point defects. The nature of these defects is not well understood yet. They may be associated with deviations from stoichiometry andor oxygen atoms located in the interstitial positions. Virtually all title crystals grown by the Czochralski method display various colours from light green to deeply red owing to light absorption by point defects. Absorption centres appear to be very stable in time and resistant to usual thermal treatment. UV excitation increases the density of defects and gives rise to strong photoluminescence, otherwise too weak to be observed.
Źródło:
Acta Physica Polonica A; 1997, 92, 1; 191-196
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Luminescence and Lifetimes of Pr$\text{}^{3+}$ Excited States in KLa$\text{}_{1-x}$Pr$\text{}_{x}$(MoO$\text{}_{4}$)$\text{}_{2}$ and KLa$\text{}_{1-x}$Pr$\text{}_{x}$(WO$\text{}_{4}$)$\text{}_{2}$ Crystals
Autorzy:
Macalik, L.
Ryba-Romanowski, W.
Gołąb, S.
Hanuza, J.
Legendziewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/1945617.pdf
Data publikacji:
1996-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Hx
78.20.Wc
Opis:
Single crystals of double molybdates and tungstates of the formula KLa$\text{}_{1-x}$Pr$\text{}_{x}$(MO$\text{}_{4}$)$\text{}_{2}$ (M = Mo, W) with a concentration of Pr$\text{}^{3+}$ ions ranging from x=0.1 to x=0.005 have been prepared. Their electronic absorption and emission spectra have been measured and discussed as well as related to their crystal structures. Both the multiphonon relaxation and cross relaxation contribute to the decay of the $\text{}^{3}$P$\text{}_{0}$ level of Pr$\text{}^{3+}$ in these two matrices.
Źródło:
Acta Physica Polonica A; 1996, 90, 2; 301-306
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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