Fabrication of high quality Rare Earth doped transparent Aluminum polycrystal and their characterization

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K18207
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Inorganic materials/Physical properties
• Research Institution: Kitami Institute of Technology
• Principal Investigator: FURUSE HIROAKI 北見工業大学, 工学部, 助教 (50506946)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 透明セラミックス / 高出力レーザー / パルス通電加圧焼結 / 放電プラズマ焼結 / アルミナ / イッテルビウム

Outline of Final Research Achievements

For next generation high power optical devises, we developed rare earth(Yb)-doped transparent Al2O3 polycrystalline ceramics. Pulsed electric current sintering, which enables densification at lower temperature and shorter sintering time, was used for sintering, and the resultant optical properties, crystal structure, and microstructure were analyzed. From this study, we obtained high quality Yb(0.2 at.%):Al2O3 polycrystalline ceramics with in-line transmittance of 55% without any second phases. The average grain size was about 200 nm, and Yb elements were observed to segregate along the grain boundaries. On the basis of the present results, we will optimize the powder-processing methods and sintering conditions for obtaining further high doping concentrations and optical properties in the future.

Free Research Field

レーザー工学、材料工学