Influence of the redox conditions of melting on the quantitative ratio of ions Fe2+/Fe3+ in aluminum potassium barium phosphate glass

Abstract

This paper reports on the results of the investigation of the KGSS 0180 phosphate laser glasses produced under industrial conditions, in which iron is contained in the form of impurities, and the glasses prepared under laboratory conditions with iron additives and a composition similar to that of the KGSS 0180 glass matrix. The influence of the redox conditions of glass melting on the quantitative ratio of ions Fe 2+ /Fe 3+ in the glass composition and on the contribution of Fe 2+ ions to the inactive absorption coefficient at the lasing wavelength (1.053 µ m) is analyzed.

Luminescence in the fluoride-containing phosphate-based glasses: A possible origin of their high resistance to nanosecond pulse laser-induced damage

“…Previous investigations on some aluminum potassium barium phosphate glasses indicate that the optical absorption at 1053 nm is due to the change of Fe 2+ /Fe 3+ ratio in the glasses, which depends on a shift in the redox equilibrium between Fe 2+ and Fe 3+ that changes with the composition and the oxygen activity. The latter is related closely to the redox states of melting 27 , glass composition 25 , melting temperature 28 , oxidizing and reducing additives to the raw materials. Therefore, the balance between the internal transmission at 3ω and 1ω/2ω absorption coefficient can be realized through adjusting the doping concentration of absorptive ions in the glass batches and the control of the glass melting environment and other melting parameters.…”

“…There are a variety of conceptual candidates to replace fused silica, such as fluoride crystals, fluoride glasses, and others 15 , among which the fluoride-phosphate glasses are verified to the potentially good UV transmitting materials 16 . On the other hand, because of the increasing demands of the high performance UV transmitting materials to be applied for lens system in UV microlithography equipments, excimer laser systems and other special UV optics, since the early 1990's, researchers has already begin systematic investigations 17 18 19 20 21 22 23 24 25 26 27 28 29 30 on the optical performance of various fluoride-phosphate and other phosphate-based glasses due to the existence of intrinsic defects, extrinsic impurity ions or under the irradiations of UV-lamp, excimer lasers, in order to explore the applicability of these glass materials. Recently, we also noticed that a kind of ultraviolet transmitting near infrared cut filter boron-containing phosphate-based glasses doped with CuO as absorptive agent 31 , which had a high UV transmittance and a low near infrared transmittance were proposed for the solid-state imaging elements or use in high power lasers for lithography, laser processing and possible use in laser fusion, but there is no report of their laser-induced damage property, which is a necessity for potential use in the ICF laser systems.…”

Synthesis of Chlorine-Silicate Phosphors for White Light-Emitting Diodes

“…Photoluminescence spectra of the prepared samples are shown in the fig. 3 The luminescence of samples 2 and 3 is observed as two bands with maximums at 465-470 and 565-580 nm, which originate from to the Eu 2+ ions embedded in a glassy matrix [8,9,10] and ions located in the crystal structure [3,11] correspondingly. The increase in the exciting UV radiation wavelength results in the PL emission spectrum shift towards longer wavelengths (fig.…”

Investigations on the photoluminescence spectra and its defect-related nature for the ultraviolet transmitting fluoride-containing phosphate-based glasses

“…With the increasing demands of high-performance UV transmitting materials to be applied for lens system in UV microlithography equipments, excimer laser systems and other special UV optics, from several decades ago till nowadays, the investigations [5][6][7][8][9][10][11][12][13][14] on the optical performance, detailed structure-property relations of various fluoride-phosphate and other phosphate-based glasses have never stopped in the pursuit of developing new types of fluoride-containing phosphate-based glasses. The effects of intrinsic defects, extrinsic impurity ions, the irradiations of UV-lamp, excimer lasers, X-ray and Gamma-ray, etc., have been widely studied in order to explore the related defect formation mechanism and the applicability of these phosphate-based glass materials.…”

“…To achieve a higher UV transmission, it is necessary to minimize the Fe 3+ content in the glasses. One way is to use the ultra-high purity raw materials with low iron content, another, to reduce Fe 3+ into Fe 2+ through a reducing glass melting conditions [13,[18][19][20].…”