Photoconductivity in Yb-doped oxides at high excitation densities |
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| Authors: | C. Brandt S. T. Fredrich-Thornton K. Petermann G. Huber |
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| Affiliation: | 1. Institute of Laser-Physics, University of Hamburg, Luruper Chaussee 149, 22761, Hamburg, Germany
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| Abstract: | Photoconductivity has been found in the dielectric laser materials Yb3+:YAG and Yb3+:Lu2O3 under 940?nm irradiation with an unexpected high photocurrent up to several 100 nanoampères. The nonlinear intensity dependence points to the occurrence of a cooperative upconversion mechanism with 2?C3 excited Yb3+-ions in YAG and 2 excited Yb3+-ions in Lu2O3 being involved. According to the results two tentative models of this upconversion process are discussed. |
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