期刊
OPTICAL MATERIALS
卷 119, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.optmat.2021.111349
关键词
Transparent ceramics; Sintering aid; Yttrium oxide; Ytterbium ion; Luminescence; Laser operation
资金
- Ministry of Science and Higher Education of the Russian Federation [0095-2019-005]
Transparent ytterbium doped yttria ceramics were fabricated using hot uniaxial pressing in vacuum and two-stage Hot Isostatic Pressing, with nanopowders obtained through self-propagating high-temperature synthesis with lithium fluoride as a sintering aid. The addition of LiF during powder synthesis changed powder morphology and reduced carbon contamination in ceramics, while also promoting sintering.
Transparent ytterbium doped yttria ceramics, 2 at.% Yb:Y2O3, were fabricated by hot uniaxial pressing in vacuum at 1550 degrees C/50 MPa followed by a two stage Hot Isostatic Pressing (HIPing) at 1200 1400 degrees C/100 MPa, using nanopowders obtained by self-propagating high-temperature synthesis (with lithium fluoride serving as a sintering aid). The addition of LiF during the powder synthesis markedly changed the morphology of powders, and at the stage of hot pressing, drastically reduced the carbon contamination of ceramics, as well as stimulated sintering without formation of the liquid phase. The spectroscopic properties of ceramics were studied. The stimulated-emission cross-section for Yb3+ ions is 0.90 x 10(-20) cm(2) at 1030.4 nm and the luminescence lifetime is 797 mu s. A continuous wave 2 at.% Yb:Y2O3 ceramic laser generated an output power of 735 mW at 1027 1034 nm with a slope efficiency of 64.5% and a laser threshold of 0.28 W.
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