Mid-infrared emission and Raman spectra analysis of Er^3+-doped oxyfluorotellurite glasses

Abstract

This paper reports on the spectroscopic and structural properties in Er(3+)-doped oxyfluorotellurite glasses. The compositional variation accounts for the evolutions of Raman spectra, Judd-Ofelt parameters, radiative properties, and fluorescent emission. It is found that, when maximum phonon energy changes slightly, phonon density plays a crucial role in quenching the 2.7 μm emission generated by the Er(3+):(4)I11/2→(4)I13/2 transition. The comparative low phonon density contributes strong 2.7 μm emission intensity. The high branching ratio (18.63%) and large emission cross section (0.95×10(-20) cm(2)) demonstrate that oxyfluorotellurite glass contained with 50 mol.% TeO2 has potential application in the mid-infrared region laser.

Low phonon energies and wideband optical windows of La2O3-Ga2O3 glasses prepared using an aerodynamic levitation technique

“…Compared with the maximum phonon energies of other oxide glasses, such as 1100 cm −1 for silicate40, 845 cm −1 for germanate41, and 790 cm −1 for tellurite glasses42, those of La 2 O 3 -Ga 2 O 3 glasses were significantly lower and even corresponded to the lowest of all oxide glasses. Because the absorption in the IR range is caused by the vibration of phonons, the low maximum phonon energies should be a good explanation why La 2 O 3 -Ga 2 O 3 showed much longer IR absorption edges than other oxide glasses.…”

Effect of B2O3 addition on thermal and optical properties of TeO2–ZnO–Bi2O3–TiO2 glasses

“…Finally, it can be seen from figure 12 that the maximum phonon energy [68][69][70][71] of all the examined glasses are nearly the same, which are in the range of 736-740 cm −1 . These values are slightly lower than most of tellurite glasses [63,72] but significantly lower than silicate glasses [73,74], borate glasses [75], phospahate glasses [76].…”

Engineering of TeO2-ZnO-BaO-Based Glasses for Mid-Infrared Transmitting Optics

“…As is seen from transmission spectra, the transmission level of all the samples was close to 70%. The broad absorption bands were due to the absorption of glass matrix, Fresnel reflections and dispersion [44][45][46][47][48]. At~3 µm, an intense hollow was observed, which corresponds to free hydroxyl groups, and the weaker hollow at~4.5 µm attributes to multiphonon absorption [44][45][46][47][48].…”

“…At~3 µm, an intense hollow was observed, which corresponds to free hydroxyl groups, and the weaker hollow at~4.5 µm attributes to multiphonon absorption [44][45][46][47][48]. The hydroxyl group absorption can be removed in the tellurite glasses with addition of fluorides along with sealing gas (Ar or O 2 ) [44][45][46][47][48]. The Raman spectra for the TZB-Mo glasses at different MoO3 concentrations are depicted in Figure 2C.…”

“…At ~3 μm, an intense hollow was observed, which corresponds to free hydroxyl groups, and the weaker hollow at ~4.5 μm attributes to multiphonon absorption [44][45][46][47][48]. The hydroxyl group absorption can be removed in the tellurite glasses with addition of fluorides along with sealing gas (Ar or O2) [44][45][46][47][48]. The coefficient of absorption (αOH−) and OH−concentration (NOH−) in the resultant tellurite glasses can be obtained by the following two equations [44][45][46][47][48], given by: The coefficient of absorption (α OH− ) and OH−concentration (N OH− ) in the resultant tellurite glasses can be obtained by the following two equations [44][45][46][47][48], given by:…”