Abstract
Using Yb3+ as a sensitizer for Er3+ doped laser materials is a common technique [1] in glass host materials because of the high Yb3+ absorption cross sections. The Yb3+ ions absorb the pump light and transfer the energy to the Er3+ ions. Due to the energy match between the 4I11/2 level of Er3+ and the 2F 5/2 level of Yb3+, the energy transfer process is resonant. Er3+ doped crystalline sesquioxides have a higher thermal conductivity, a higher hardness, higher peak emission cross sections and narrower emission peaks compared to Er3+:glass. These advantages make crystalline Er3+:Sc 2 O 3 a promising laser material. In this work the energy transfer from Yb3+ to Er3+ in crystalline Sc 2 O 3 is studied. For the spectroscopic characterization, crystalline Sc 2 O 3 films with different Er3+,Yb3+ concentrations have been grown on a-Al 2 O 3 substrates by Pulsed Laser Deposition (PLD).
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