Publication Date:
2015-04-29
Description:
Tetravalent chromium-doped Y 3 Al 5 O 12 ceramics were fabricated by solid-state reactive sintering method using high-purity Y 2 O 3 , α- Al 2 O 3 , and Cr 2 O 3 powders as the starting materials. CaO and MgO were co-doped as the sintering aids. The effects of TEOS and divalent dopants (CaO and MgO) on the optical qualities, the conversion efficiency of Cr 4+ ions, and the microstructure evolutions of 0.1 at.% Cr 4+ : YAG ceramics were investigated. Fully dense, dark brown colored Cr 4+ : YAG ceramics with an average grain size of 3.1 μm were achieved. The in-line transmittance of the as-prepared ceramic at 2000 nm was 85.3% (4 mm thick), and the absorption coefficient at 1030 nm (the characteristic absorption peak of Cr 4+ ions) was as high as 3.7 cm −1 , which was higher than that of corresponding single crystals fabricated by Czochralski method.
Print ISSN:
0002-7820
Electronic ISSN:
1551-2916
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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