Other
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005phrvb..71d5115l&link_type=abstract
Physical Review B, vol. 71, Issue 4, id. 045115
Other
4
Optical Properties Of Bulk Materials And Thin Films, Photoluminescence, Properties And Materials, Other Luminescence And Radiative Recombination, Optical Materials
Scientific paper
The photon avalanche upconversion mechanism in a Ho3+ - Yb3+ system under near infrared excitation is discussed. Two looping cycles in the excitation process provide the necessary population of the 5I7 intermediate level of Ho3+ ions to achieve the avalanche regime. The first one takes place between Ho3+ ions, while the second one occurs between Ho3+ and Yb3+ ions. We present a simplified model of the process, which only takes into account the ground, intermediate and emitting levels of Ho3+ and the ground and excited levels of Yb3+ ions. The rate equations of the system have been solved, and the photon avalanche regime has been interpreted in terms of gain and loss of the population of the intermediate level. The model predicts a reduction of the avalanche pump power threshold when the Yb3+ concentration increases which is in good agreement with experimental data.
Alonso David
Lahoz F.
Martín I. R.
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