Hannover 2003 – wissenschaftliches Programm
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Q: Quantenoptik
Q 22: Festkörperlaser 3
Q 22.1: Vortrag
Dienstag, 25. März 2003, 14:00–14:15, E001
Spectroscopy of highly doped Yb:YAG crystals — •Dione F. de Sousa, Volker Peters, Natalyia Martynyuk, Volker Peters, Kai Lünstedt, Klaus Petermann, and Günter Huber — Institut für Laser-Physik, Universität Hamburg, Jungiusstr. 9a, 20355 Hamburg
The Yb3+:YAG lasers around 1030nm have attracted much attention for thin disk lasers due to the possibility of high doping levels, excellent thermal properties of the matrix and the simple energy level structure of Yb3+ which prevents quenching processes due to Yb3+:Yb 3+ interactions. However, when highly doped in the host, the energy migration among Yb3+ ions and subsequent energy transfer to impurity ions decreases the Yb3+ lifetime. In this work, the quenching of the Yb3+ luminescence in YAG crystals by Yb2+, Fe3+ and Ni2+ is studied by means of pump intensity dependent lifetime measurements. The 80%Yb:YAG, 0.1%Ni:YbAG and 0.1%Fe:YbAG samples were grown by Czochralski technique under reducing atmosphere. The results showed different dependence on pump power for the Yb 3+ lifetime when interacting with Yb2+, Ni2+ or Fe3+. The quenching by Ni2+ is pump power independent and the Yb3+ lifetime is about 370µ s. On the other hand, the quenching by Fe3+ and Yb 2+ increases with pump power indicating that a cooperative energy transfer process is active.