Abstract
Transparent chromium doped Y3Al5O12 ceramics with excellent optical qualities were successfully fabricated by solid state reaction sintering using divalent dopants (CaO and MgO) as sintering aids, and the conversion efficiency of Cr4+ ion in Cr: YAG ceramic was effectively regulated by various approaches. All samples were fully transparent after vacuum sintered at 1820 °C for 8 h. It was found that under fixed amount of divalent dopants, the conversion efficiency of Cr4+ ion in Cr: YAG ceramics was significantly increased by increasing Cr doping concentration, elevating annealing temperature, prolonging annealing soaking time or adopting oxygen annealing atmosphere. The absorption coefficient of as fabricated 0.1 at.% Cr: YAG ceramics at 1030 nm reached up to 5.2 cm−1 after annealed at 1300 °C for 30 h under an oxygen atmosphere. It was much higher than that of corresponding single crystal fabricated by traditional Czochralski method.
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