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  • 2013 Conference on Lasers and Electro-Optics - International Quantum Electronics Conference
  • (Optica Publishing Group, 2013),
  • paper CA_8_5

Temperature Development in Yb:YAG Thin-Disk Lasers at High Inversion Densities Confirming Nonlinear Losses

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The thin-disk laser configuration, which allows for particularly efficient high power lasers, demands an active medium with high doping levels in order to achieve sufficient absorption within the thin disk. Yb3+-doped YAG is a very suitable medium for this application because it offers a high doping potential and superior thermo-physical properties. The simple energy level scheme of the Yb3+-ion prohibits quenching processes such as cross-relaxation and up-conversion. However, Yb:YAG thin-disk lasers suffer decay processes that generate heat and inhibit laser operation at high doping concentrations and inversion densities [1]. These processes depend on the excitation density in the active medium and reduce the laser efficiency of Yb:YAG crystals even at conventionally low doping concentrations [2]. Additionally it has been found that Yb:YAG ceramic active media display higher efficiencies and a lower sensitivity to the Yb-excitation dependent losses than single crystalline active media [3].

© 2013 IEEE

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