Radosław Lisiecki

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Correlation between structure and optical properties of rare earth ions in lead borate glasses and glass-ceramics was evidenced by X-ray-diffraction, Raman, FT-IR and luminescence spectroscopy. The rare earths were limited to Eu(3+) and Er(3+) ions. The observed BO(3)↔BO(4) conversion strongly depends on the relative PbO/B(2)O(3) ratios in glass(More)
Optical absorption, luminescence excitation and emission spectra as well as luminescence kinetics of the Nd<sup>3+</sup> centres in glasses with Li<inf>2</inf>B<inf>4</inf>O<inf>7</inf>:Nd, LiCaBO<inf>3</inf>:Nd, and CaB<inf>4</inf>O<inf>7</inf>:Nd compositions containing 0.5 and 1.0 mol. % Nd<inf>2</inf>O<inf>3</inf> have been investigated and analyzed.(More)
An Nd-doped Lu(1.5)Y(1.5)Al(5)O(12) (Nd:LuYAG) crystal was obtained by Czochralski method. Absorption and emission spectra were recorded at low and room temperature. Continuous wave (CW) and passively Q-switched laser operations of Nd:LuYAG crystal were, to our knowledge, demonstrated for the first time. A CW output power of 1.67 W with slope efficiency of(More)
UNLABELLED Presence of free gastric cancer cells in the peritoneal cavity of patients who underwent surgical treatment for gastric cancer is a negative prognostic factor and caused rapid disease recurrence, manifested as peritoneal metastases. Positive peritoneal cytology despite lack of visible peritoneal metastases was regarded as M1 class in the TNM(More)
Upon UV–VUV excitation terbium doped K5Li2LaF10 emits white light coming from the D3 and D4 multiplets for content of Tb 3+ up to 10 at%. For higher concentrations (80 and 100 at%) the emission becomes green. In excitation spectrum, recorded at 12 K, the positions of the zero-phonon lines are not well determined. The spin allowed f–d transitions in this(More)
Optical spectra and luminescence decay curves were measured for thulium-doped YVO(4), GdVO(4), and LuVO(4) single crystals as a function of temperature in the 300-670 K temperature region. In spite of structural similarity, the three systems studied display significantly different transition intensities and nonradiative relaxation rates. It was found, in(More)
High optical quality Nd-doped Sc(2)SiO(5) crystal with size of diameter 27 mm x 60 mm was obtained by Czochralski method. An x-ray diffraction pattern of Nd:SSO crystal confirmed that the as-grown crystal was isostructual with the SSO crystal. Absorption and emission spectra were recorded at 10 K. The Judd-Ofelt theory was applied to obtain standard(More)
Nanocrystals of tripotassium neodymium bis-phosphate(V) doped with ytterbium ions, K3Nd(PO4)2: Yb3+, were synthesized by Pechini method. The obtained grains, having an average size of about 40 nm, were characterised by X-ray, electron microscopic, electron absorption, luminescence and IR studies. Moreover, fluorescence decay studies were carried out at room(More)
Optical spectra and luminescence decay curves were measured for erbium-doped YVO(4) and GdVO(4) single crystals as a function of temperature in the 300 K-670 K temperature region. In spite of structural similarity the two systems studied display significantly different transition intensities and nonradiative relaxation rates. It was found in particular that(More)
Spectroscopic features of Eu3+, Nd3+ and Er3+ in nanocrystalline samples of gallium gadolinium garnet prepared by a modified sol-gel method were investigated in order to assess the structural compatibility of the material with a single crystal counterpart. Emission spectra and decay curves of luminescent admixtures were recorded and analysed. Observed(More)