Synthesis and study of Fe²⁺ : MgAl₂O₄ ceramics for active elements of solid-state lasers

Synthesis, structure and spectroscopy of Fe2+:MgAl2O4 transparent ceramics and glass-ceramics

“…The lattice constants of both spinels are similar, a = 8.083±0.003 Å (for the Fe:MgAl2O4 spinel) and 8.088±0.003 Å (for the undoped MgAl2O4 one). Quite similar lattice constants a = 8.086±0.002 Å and 8.087±0.002 Å and were reported in [50] for MgAl2O4 doped with 0.1 and 1wt% Fe3O4, respectively. The lattice parameter in Fe:MgAl2O4 ceramic is slightly larger than that for the initial powder (a = 8.063 Å [34]), which is most likely due to the presence of a sintering aid of lithium fluoride in the powder that can enter the spinel structure [63].…”

“…In the previous works [49][50][51][83][84][85], the presence of Fe 3+ was detected by measuring the visible luminescence spectra of iron-doped samples revealing emissions centered at ~0.51, 0.62 and 0.72 μm and originated from the 4 G excited states. The emission spectrum for our ceramic sample is shown in Fig.…”

“…In this work, we aim to fabricate and study the microstructure, vibronic and optical properties of novel transparent ceramics and GCs based on Fe 2+ :MgAl2O4 spinel crystals. Previously, the authors from the Institute of Electrophysics UD RAS reported the development of transparent Fe 2+ :MgAl2O4 ceramics [49][50][51]. The obtained ceramics [49][50][51] contained secondary oxide phase of (MgO)0.91(FeO)0.09 causing a substantial decrease in transmittance in the visible range.…”

“…Previously, the authors from the Institute of Electrophysics UD RAS reported the development of transparent Fe 2+ :MgAl2O4 ceramics [49][50][51]. The obtained ceramics [49][50][51] contained secondary oxide phase of (MgO)0.91(FeO)0.09 causing a substantial decrease in transmittance in the visible range. In those ceramics Fe 3+ ions are located both in the primary spi-4 nel phase Fe:MgAl2O4 and in the secondary phase Fe:MgO, which results in a very low determined GSA cross sections of Fe 2+ ions in tetrahedral site symmetry [49].…”

Highly transparent ceramics for the spectral range from 1.0 to 60.0 µm based on solid solutions of the system AgBr–AgI–TlI–TlBr

“…Widespectrum laser systems are particularly important, including covering "atmospheric transparence windows" (3-5 μm) and absorption bands of numerous molecular compounds: water molecules and oxygen-and carbon-containing impurities. Technologies for the synthesis of new crystals [6][7][8][9][10][11] , glasses [6,7,[12][13][14] , laser ceramics based on spinels [15][16][17][18] , and luminescent materials with a low-frequency phonon spectrum based on oxohalogenide systems-fluoride, chloride, bromide, and iodide-are being developed [19][20][21][22][23][24] . The authors note that the replacement of fluorine with other ions-chlorine, bromine, or iodine-in systems significantly extends the transparency range of glass-crystal ceramics to a longer-wave region.…”