Abstract
Developing large laser grade cubic rare-earth sesquioxides (RE 2 O 3 , RE=Y,Sc,Lu) single crystals doped with Yb 3+ ions stands as one of the most challenging endeavours of today's crystal growth 1,2 . Recent studies on cubic RE 2 O 3 single crystals have demonstrated their laser potential and highlighted the extreme thermodynamic conditions in which their growth takes place 1-3 . In particular, the laser performances of Lu 2 O 3 :Yb 3+ crystals make them likely to outperform betterknown rivals such as YAG:Yb 3+ or KY(WO 4 ) 2 :Yb 3+ for 976 nm diode-pumped systems 4 . Several mm 3 -sized Yb 3+ -doped Y 2 O 3 , Gd 2 O 3 and Lu 2 O 3 single crystals were recently grown by a newly designed high-temperature solution growth method 5 , and characterized by means of X-ray diffraction, Fourier transformed infrared (FTIR) spectroscopy and electron probe microanalysis (EPMA). Spectroscopic characterizations (absorption and emission cross sections, visible anti-Stokes emission, fluorescence decays) of these new cubic RE 2 O 3 :Yb 3+ (RE=Y,Lu) single crystals are presented.
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