Esmaspäeval, 17. novembril 2014. kell 16.15 toimub Physicumis Ravila 14C 3. korruse seminariruumis D312
Väike materjalifüüsika ja spektroskoopia seminar nr. 185
Dr Andrey Lyapin
Institute of Physics and Chemistry, Mordovia State University, Saransk
Spectral-luminescent properties of CaF2:Tm, CaF2:Ho single crystals and ceramics and their application in laser physics
Comparative study of absorption and emission spectra of CaF2:Tm ceramic and single crystal samples demonstrated that these materials possess almost identical spectroscopic properties. Laser oscillations of CaF2:Tm ceramics were obtained at 1898 nm under diode pumping, with the slope efficiency of 5.5%. Also, the continuous-wave (CW) laser have been obtained for CaF2:Tm single crystal at 1890 nm pumped by the diode laser was demonstrated. We also studied mechanism of upconversion luminescence of CaF2:Ho crystals and ceramics in the visible and near-IR wavelength regions upon excitation of the level 5I7. A methods of visualization two-micron laser radiation using CaF2:Ho crystals and ceramics were proposed.