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1
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Influence of Temperature on Refractive Indices of BaLaGa_{3}O_{7} and SrLaGa_{3}O_{7}

100%
Ryba-Romanowski W., Gołąb S., Berkowski M.
Acta Physica Polonica A
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1993
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vol. 83
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issue 2
167-172
EN
A simple theoretical approach based on Kramers-Krönig relations predicts well the dispersion and birefringence of BaLaGa_{3}O_{7} and SrLaGa_{3}O_{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_{3}O_{7} and SrLaGa_{3}O_{7} is stable with respect to the temperature region of 300-550 K. The refractive indices increase linearly at a rate of 2 × 10^{-5} K^{-1} with increasing temperature.
2
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Material Parameters Characterizing the Performance of Flashlamp Pumped BaLa_{1-x}Nd_{x}Ga_{3}O_{7} Laser

100%
Ryba-Romanowski W., Gołąb S., Berkowski M.
Acta Physica Polonica A
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1991
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vol. 79
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issue 4
501-506
EN
Physical properties of optically uniaxial BaLa_{1-x}Nd_{x}Ga_{3}O_{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_{1-x}Nd_{x}Ga_{3}O_{7} have been defined.
3
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Relaxation of the ^{4}S_{3/2} Level of Er^{3+} in Cs_{2}NaErCl_{6}

100%
Dominiak-Dzik G., Gołąb S., Ryba-Romanowski W.
Acta Physica Polonica A
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1993
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vol. 84
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issue 5
941-944
EN
Octahedral (O_{h}) symmetry of the RE^{3+} sites in the Cs_{2}NaRECl_{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 ^{4}S_{3/2} state of erbium in Cs_{2}NaErCl_{6} has been studied in the 4.2-300 K temperature region. It has been concluded that at low temperatures the ^{4}S_{3/2} state decays exclusively by vibronic transitions. At about 100 K the cross relaxation via the ^{4}I_{9/2} state becomes operative. Efficiency of this process grows strongly with increasing temperature, reducing the ^{4}S_{3/2} lifetime by almost three orders of magnitude. No evidence has been found that multiphonon relaxations contribute to the decay of the ^{4}S_{3/2} state.
4
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Luminescence and Lifetimes of Pr^{3+} Excited States in KLa_{1-x}Pr_{x}(MoO_{4})_{2} and KLa_{1-x}Pr_{x}(WO_{4})_{2} Crystals

88%
Macalik L., Ryba-Romanowski W., Gołąb S., Hanuza J., Legendziewicz J.
Acta Physica Polonica A
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1996
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vol. 90
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issue 2
301-306
EN
Single crystals of double molybdates and tungstates of the formula KLa_{1-x}Pr_{x}(MO_{4})_{2} (M = Mo, W) with a concentration of Pr^{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 ^{3}P_{0} level of Pr^{3+} in these two matrices.
5
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Optical Study of SrLaGaO_{4} and SrLaGa_{3}O_{7} Doped with Nd^{3+} and Yb^{3+}

88%
Ryba-Romanowski W., Gołąb S., Pisarski W., Dominiak-Dzik G., Gloubokov A.
Acta Physica Polonica A
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1996
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vol. 90
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issue 2
399-406
EN
Single crystals of SrLaGaO_{4} and SrLaGa_{3}O_{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^{2+} and La^{3+} ions over the lattice sites. A previous investigation of a laser diode pumped SrLaGa_{3}O_{7}:Nd laser revealed that inhomogeneous broadening of spectral lines of Nd^{3+} was advantageous for optical pumping and did not influence adversely the extraction efficiency. The present paper deals mainly with optical properties of Yb^{3+} ions which are of interest for the design of lasers pumped by a diode laser and operating near 1 μm.
6
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Investigation of As Grown and Induced Structural Defects in SrLaXO_{4} (x = Al, Ga) Crystals

76%
Ryba-Romanowski W., Gołąb S., Dereń P., Dominiak-Dzik G., Pisarski W., Gloubokov A.
Acta Physica Polonica A
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1997
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vol. 92
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issue 1
191-196
EN
SrLaGaO_{4} and SrLaAlO_{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.
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