Transparent ultrafine Yb3+:Y2O3 laser ceramics fabricated by spark plasma sintering
Transparent ultrafine Yb3+:Y2O3 laser ceramics fabricated by spark plasma sintering
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DOI：
10.1111/jace.15232
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发表时间：
2018-02-01
影响因子：
3.9
通讯作者：
Hiraga, Keijiro
中科院分区：
文献类型：
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作者：
Furuse, Hiroaki;Nakasawa, Shunsuke;Hiraga, Keijiro
传统的陶瓷加工技术不能生产超细颗粒材料。然而，由于陶瓷的力学和光学性能高度依赖于颗粒尺寸，因此需要先进的加工技术来获得颗粒尺寸小于可见光波长的陶瓷以满足新的激光光源的需要。采用放电等离子烧结(SPS)技术制备了不同掺杂浓度的Yb3+：Y2O3透明陶瓷，并对其微观结构、光学和光谱性能进行了分析。对10at.%Yb~(3+)：Y_2O_3陶瓷进行了激光振荡。本研究中的激光陶瓷在没有添加烧结助剂的情况下烧结，SPS产生了平均晶粒尺寸为261 nm的超细结构，比传统工艺烧结的陶瓷小一个数量级。在加热过程中施加负载以增强致密化，获得了接近理论值的在线透过率。晶体结构分析表明，Yb3+：Y2O3陶瓷为固溶体。据我们所知，这项研究不仅验证了SPS获得的超细晶陶瓷的激光性能，而且验证了Yb掺杂陶瓷的激光性能。
Conventional ceramic processing techniques do not produce ultrafine-grained materials. However, since the mechanical and optical properties are highly dependent on the grain size, advanced processing techniques are needed to obtain ceramics with a grain size smaller than the wavelength of visible light for new laser sources. As an empirical study for lasing from an ultrafine-grained ceramics, transparent Yb3+:Y2O3 ceramics with several doping concentrations were fabricated by spark plasma sintering (SPS) and their microstructures were analyzed, along with optical and spectroscopic properties. Laser oscillation was verified for 10at.% Yb3+:Y2O3 ceramics. The laser ceramics in our study were sintered without sintering additives, and the SPS produced an ultrafine microstructure with an average grain size of 261nm, which is about one order of magnitude smaller than that of ceramics sintered by conventional techniques. A load was applied during heating to enhance densification, and an in-line transmittance near the theoretical value was obtained. An analysis of the crystal structure confirmed that the Yb3+:Y2O3 ceramics were in a solid solution. To the best of our knowledge, this study is the first report verifying the lasing properties of not only ultrafine-grained but also Yb-doped ceramics obtained by SPS.