V. V. Osipov, V. A. Shitov, K. E. Luk'yashin, V. V. Platonov, V. I. Solomonov, A. S. Korsakov, A. I. Medvedev, “Synthesis and study of Fe2+ : MgAl2O4 ceramics for active elements of solid-state lasers”, Kvantovaya Elektronika, 2019, Volume 49, Number 1,Pages 89

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

V. V. Osipov^a, V. A. Shitov^a, K. E. Luk'yashin^a, V. V. Platonov^a, V. I. Solomonov^ab, A. S. Korsakov^b, A. I. Medvedev^ab

^a Institute of Electrophysics, Ural Branch, Russian Academy of Sciences, Ekaterinburg
^b Ural Federal University named after the First President of Russia B. N. Yeltsin, Ekaterinburg

Abstract: The results of pioneering studies on preparation of highly transparent Fe²⁺ : MgAl₂O₄ ceramics from powders synthesised in a laser torch are presented. This ceramics with a high transparency in the near-IR spectral region is synthesised for the first time at a low temperature (1300 °C) and a short (1 h) sintering time. It is found that, as the iron oxide concentration increases from 0.1 to 5 wt %, the concentration of Fe³⁺ ions in samples decreases to zero. It is shown that the samples of Fe²⁺ : MgAl₂O₄ ceramics contain the second phase (MgO)_0.91(FeO)_0.09 with a concentration of several percent, which considerably decreases transmission coefficient T in the visible region. At the same time, the T coefficient increases with increasing wavelength λ due to a decrease in Rayleigh scattering and almost reaches the theoretical value 85.6% for λ = 4 μm. The absorption cross section σ for Fe²⁺ ions at λ = 2 μm is determined to be (1.66 ± 0.14) × 10^-20 cm².

Keywords: ceramics, spinel, iron, mid-IR region.

Received: 02.09.2018
Revised: 09.10.2018