Applied Physics B

, Volume 102, Issue 4, pp 765–768 | Cite as

Photoconductivity in Yb-doped oxides at high excitation densities

  • C. Brandt
  • S. T. Fredrich-Thornton
  • K. Petermann
  • G. Huber


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 2–3 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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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • C. Brandt
    • 1
  • S. T. Fredrich-Thornton
    • 1
  • K. Petermann
    • 1
  • G. Huber
    • 1
  1. 1.Institute of Laser-PhysicsUniversity of HamburgHamburgGermany

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