Optical properties of alkali-antimonite glasses and purified processes for fiber drawing

International audienceWe study Antimonite glasses in the ternary systems Sb2O3-PbO-M2O (M = Li, Na, K). We have measured the density and refractive index according to the glass composition in this system. We have also measured the optical transmission in the UV-Vis and infrared range and the optical band gap. The influence of glass synthesis on extrinsic absorption has been studied. For the first time in this system, we have observed that stable glassy composition was drawn into a fiber, and the optical losses were determined in the 1-5 μm infrared region

Electrical, dielectric, and optical properties of Sb2O3–Li2O–MoO3 glasses

International audienceTemperature and frequency dependencies of DC and AC conductivities, dielectric response, static permittivity, optical absorption edge, infrared absorption spectrum, density, and temperatures of glass transition and crystallization for lithium molybdenum–antimonite glasses, (80 − x)Sb2O3–20Li2O–xMoO3, where x = 0–40, are measured and discussed. The DC conductivity increases with increasing concentration of MoO3. At 150 °C, it ranges from 5 × 10− 11 S/m up to 3 × 10− 8 S/m. Polaron hopping between Mo5 + and Mo6 + ions contributes, probably, to the DC conductivity. Ionic conductivity by Li+ ions is also present. The conduction activation energy monotonously decreases from 1.15 eV, at x = 5, down to 0.91 eV, at x = 40. In all glasses with x > 0, the conduction activation energy is close to a half of the indirect allowed optical gap. The pre-exponential factor, σ0, goes through a sharp maximum close to the composition (x = 20) with both the highest glass transition temperature and the largest thermal stability range. The frequency dependence of the AC conductivity is composed of three components — the DC conductivity and two AC components. For x = 35 and 40, the activation energy of electrical relaxation is equal to 0.954 ± 0.008 eV and the pre-exponential factor of relaxation times is equal to (4 ± 1) 10− 14 s. The static relative permittivity ranges from 17.4 to 23.0. Strong extrinsic absorption bands in infrared region originate from hydroxyl ions, CO2 impurities, and silicon–oxygen vibrations. The UV–visible indirect allowed absorption edge shifts from 2.6 eV to 2.1 eV with increasing MoO3 content. With increasing MoO3 content the glasses darken, from a light yellow color, at x = 0, to a deep brown color, at x = 40

Verres d ' oxydes lourds a base de Sb 2 O 3 , exploration , caracterisation physico-chimiques et application a l ' amplification optique

This study focuses on the synthesis of glasses doped with erbium designed primarily for applications as optical amplifier. New glassy systems Sb2O3- M2O-ZnO, Sb2O3- M2O-MoO3 and Sb2O3- M2O-CdO-(M: Li, Na and K) were put in evidence. Several physical and optical measurements of the glasses (80-x) Sb2O3-20Na2O-xZnO and (80-x) Sb2O3-20Li2O-xMoO3 were determined such as the glass transition temperature, density, coefficient of thermal expansion, elastic modules, microhardness, viscosity and spectra in the UV-Vis-NIR. Luminescence study of erbium ions has been carried out on 70Sb2O3-20Na2O-10ZnO glasses doped with varying concentrations of Er2O3 by using absorption spectra in the UV-Vis-NIR, emission fluorescence and the time resolved fluorescence spectroscopy. Some basic spectroscopic properties was made by applying Judd-Ofelt theory. These glasses are very stable and have a refractive index close to 2. The spectroscopic study of the Er3+ ion in this glass shows a good correlation between the theoretical judd-ofelt analysis and experimental measurements

Verres d'oxydes lourds à base de Sb2O3, exploration, caractérisations physico-chimiques et application à l'amplification optique

Cette étude s'inscrit dans la recherche de nouveaux verres stables dopés à l’erbium pour l’optique, visant essentiellement des applications dans les amplificateurs optiques. De nouveaux systèmes vitreux Sb2O3-M2O-ZnO, Sb2O3-M2O-MoO3 et Sb2O3-M2O-CdO (M: Li, Na et K) ont été mis à l’évidence. Plusieurs mesures physiques et optiques des verres (80-x)Sb2O3-20Na2O-xZnO et (80-x)Sb2O3-20Li2O-xMoO3 ont été déterminées. Il s’agit de la température de transition vitreuse, la densité, coefficient de dilatation thermique, les module élastiques, la microdureté, la viscosité ainsi que les spectres dans le domaine UV-Vis-PIR. Pour l’étude de l’amplification des ions erbium, des verres 70Sb2O3- 20Na2O-10ZnO dopés par des concentrations variables d’Er2O3 ont été étudiés en utilisant les méthodes spectroscopiques d’absorption dans l’UV-Vis- PIR, les spectres d'émission et le déclin de la fluorescence. La détermination de certaines propriétés spectroscopiques de base a été faite par l’application de la théorie Judd-Ofelt. Ces verres très stables, possèdent un indice de réfraction proche de 2. L'étude spectroscopique de l'ion Er3+ dans ce verre montre une bonne corrélation entre les propriétés radiatives théoriques déterminées par la méthode de judd-ofelt et les propriétés radiatives expérimentales

Optical properties of erbium doped antimony based glasses: Promising visible and infrared amplifiers materials

International audienceHighly stable glasses in the (70 − x)Sb2O3[BOND]20Na2O[BOND]10ZnO[BOND]xEr2O3 (x = 0.25, 0.5, and 1.0 mol%) system have been prepared and investigated by UV-Vis-NIR absorption, near infrared photoluminescence and time-resolved spectroscopy. Judd-Ofelt study has been used to determine the intensity parameters (Ω2, Ω4, and Ω6), spontaneous emission probabilities, branching ratios, and radiative lifetimes (τR) related to the corresponding optical transitions of Er3+ ions. Details of the emission at ∼1530 nm and spectroscopic characteristics such as the stimulated emission cross-section (σe), effectiveband width (Δλeff), quantum efficiency, and the optical gain have been summarized, accounting the role of the increased Er content. The obtained results indicate that these new low phonon energy glasses could be used as a laser medium and for optical amplification in the 1.5 µm region. In particular, the composition containing 0.5 mol% Er2O3 exhibits optimal values of Ω2 (4.5 × 10−20 cm2), Δλeff = 57 nm, σe = 7.28 × 10−21 cm2, τmeas (3.36 ms), and quantum efficiency of the 4I13/2 level of Er3+ ions ∼71%

Abstracts of 1st International Conference on Computational & Applied Physics

This book contains the abstracts of the papers presented at the International Conference on Computational & Applied Physics (ICCAP’2021) Organized by the Surfaces, Interfaces and Thin Films Laboratory (LASICOM), Department of Physics, Faculty of Science, University Saad Dahleb Blida 1, Algeria, held on 26–28 September 2021. The Conference had a variety of Plenary Lectures, Oral sessions, and E-Poster Presentations. Conference Title: 1st International Conference on Computational & Applied PhysicsConference Acronym: ICCAP’2021Conference Date: 26–28 September 2021Conference Location: Online (Virtual Conference)Conference Organizer: Surfaces, Interfaces, and Thin Films Laboratory (LASICOM), Department of Physics, Faculty of Science, University Saad Dahleb Blida 1, Algeria