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Yekaterinburg, Russia

Osipov V.V.,Institute of Electrophysics UrB RAS | Shitov V.A.,Institute of Electrophysics UrB RAS | Solomonov V.I.,Institute of Electrophysics UrB RAS | Solomonov V.I.,Ural Federal University | And 3 more authors.
Ceramics International | Year: 2015

This work reports the fabrication of composite transparent ceramics consisting of a Nd:YAG central part and a Cr4+:YAG edge cladding. The central part of ceramics was shaped into 14mm-diameter disk or 11mm-side square and an outer diameter of the edge cladding was 18mm or 23mm, respectively. The central part of ceramics exhibited an optical transmittance of ~84% at the wavelength of 1.06μm. The concentration of Cr4+ in Cr4+:YAG ceramics with three different compositions was evaluated using measured transmission spectra and reported absorption cross sections. Taking into account the infeasibility condition for self-excitation, the optimal composition of edge cladding was estimated to be 2.5at% Cr, 0.25at% Ca:YAG. © 2015 Elsevier Ltd and Techna Group S.r.l.

Osipov V.V.,Institute of Electrophysics UrB RAS | Ishchenko A.V.,Ural Federal University | Shitov V.A.,Institute of Electrophysics UrB RAS | Maksimov R.N.,Institute of Electrophysics UrB RAS | And 8 more authors.
Optical Materials | Year: 2016

Highly transparent YAG:Ce ceramics (transmission of 72-82% for 2-mm-thick samples in 550-900 nm wavelength range) were fabricated by solid-state reactive sintering using a mixture of Ce2xY2-2xO3 (x = 0.001, 0.01, 0.03, and 0.05) and Al2O3 nanopowders synthesized by laser ablation with an additional round of pre-calcining before compaction. The synthesized YAG:Ce ceramic materials showed intense luminescence with a maximum at 525-545 nm. The measured absolute light yields of the synthesized YAG:Ce ceramics were 18-21 photon/MeV for 1-5 at.% Ce and 5 photon/MeV for 0.1 at.% Ce. The energy resolutions of the fabricated thin ceramic samples (2 mm) under 662 keV gamma ray were measured to be 10-15%. The decay curves of scintillations consisted of two components with the decay times depending on the Ce3+ concentration. The sample doped with 5 at.% of Ce exhibited the main fast component with 26 ns decay time. The measured data was compared to that of YAG:Ce and well-known CsI:Tl single crystal scintillators. The influence of dopant concentration on the optical, luminescence and scintillation properties was discussed. © 2016 Elsevier B.V.

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