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- ItemInfluence of Al2O3, ZrO2 and TiO2 on the properties of the microporous glasses from the system Na2O-B2O3-SiO2(Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 2003) Procyk, Bernadeta; Dorosz, Dominik; Bieniarz, Piotr; Zawada, Anna; Höhne, DiethardGlasses from the Na2o-B2O3-SiO2 system, doped with AI2O3, ZrO2 and TiO2, were thermally (in the temperature range of 420 to 700 °C) and chemieally treated. During thermal treatment, separation of the borate phase from the silica skeleton occurrred resulting in the formation of an interconnected microstructure. The borates were in the form of small drops joined to each other. In the course of chemical treatment the borates were leached in water and water solutions of acids or bases with the glass becoming very porous. The experiments showed that ZrO2 and TiO2 caused an increase in pore diameter at defmite leaching times. AI2O3, however, decreased it, so that glasses doped with AI2O3 have a greater specific surface. In this case a double-pore distribution occurred. Porous glasses may find application in many branches of science and engineering. The applications depend on the internal arrangement, size and shape of pores. These parameters may be in a wide range modified by a change of the chemical composition. Testing structure and properties of microporous glasses from the system Na2O-B2O3-SiO2 with different additions was the main aim of this work. The following testing methods were applied: DTA, XRD, TEM, infrared spectroscopy and sorption porosimetry.
- ItemTm3+/Ho3+ co-doped germanate glass double-clad fiber for broadband emission and lasing above 2 µm(Washington D.C. : Optical Society of America, 2019) Kochanowicz, Marcin; Zmojda, Jacek; Miluski, Piotr; Baranowska, Agata; Leich, Martin; Schwuchow, Anka; Jäger, Matthias; Kuwik, M.; Pisarska, Johanna; Pisarski, Wojciech A.; Dorosz, DominikIn this paper, a 2 µm broadband emission under 796 nm laser diode excitation in low phonon energy GeO2-Ga2O3-BaO glass system is co-doped with 0.7Tm2O3/(0.07-0.7)Ho2O3 (mol%). The widest emission band (where the Tm3+ → Ho3+ energy transfer efficiency is 63%) was obtained for 0.7Tm2O3/0.15Ho2O3 co-doped glass from which a double-clad optical fiber was realized and investigated. Optimization of Tm3+/Ho3+ concentration enabled the acquisition of broadband amplified spontaneous emission (ASE) in double-clad optical fiber with a full width at half maximum (FWHM): 377 nm and 662 nm for 3 dB and 10 dB bandwidth, respectively. ASE spectrum is a result of the superposition of (Tm3+: 3H4 →Η3F4) 1.45 µm, (Tm3+: 3F4 → 3H6) 1.8 µm and (Ho3+:5I7 → 5I8) 2 µm emission bands. Hence, highly rare-earth co-doped germanate glass is characterized by a remarkably broader ASE spectrum than silica and tellurite fibers showed promising lasing properties for their further application in tunable and dual wavelength lasers.In this paper, a 2 µm broadband emission under 796 nm laser diode excitation in low phonon energy GeO2-Ga2O3-BaO glass system is co-doped with 0.7Tm2O3/(0.07-0.7)Ho2O3 (mol%). The widest emission band (where the Tm3+ → Ho3+ energy transfer efficiency is 63%) was obtained for 0.7Tm2O3/0.15Ho2O3 co-doped glass from which a double-clad optical fiber was realized and investigated. Optimization of Tm3+/Ho3+ concentration enabled the acquisition of broadband amplified spontaneous emission (ASE) in double-clad optical fiber with a full width at half maximum (FWHM): 377 nm and 662 nm for 3 dB and 10 dB bandwidth, respectively. ASE spectrum is a result of the superposition of (Tm3+: 3H4 →Η3F4) 1.45 µm, (Tm3+: 3F4 → 3H6) 1.8 µm and (Ho3+:5I7 → 5I8) 2 µm emission bands. Hence, highly rare-earth co-doped germanate glass is characterized by a remarkably broader ASE spectrum than silica and tellurite fibers showed promising lasing properties for their further application in tunable and dual wavelength lasers.