EDP Sciences Journals List
Issue J. Phys. IV France
Volume 04, Number C4, Avril 1994
3rd International Conference Laser M2P
Page(s) C4-501 - C4-504
DOI http://dx.doi.org/10.1051/jp4:19944120

3rd International Conference Laser M2P

J. Phys. IV France 04 (1994) C4-501-C4-504

DOI: 10.1051/jp4:19944120

Mechanisms of up-conversion excitation of blue emission in YAG:Tm, Yb

A. KNÜPFER1, V. OSTROUMOV1, E. HEUMANN1, G. HUBER1 and V. LUPEI2

1  Universität Hamburg, Institut für Laser-Physik, Jungiusstrasse 11, 20355 Hamburg, Germany
2  Institute of Atomic Physics, Bucharest 76900, Romania


Abstract
Trivalent ytterbium ions were used as sensitizers for the 1D2 and 1G4 blue emitting thulium levels. The evolution of the population of the 1D2, 1G4, 3H4, 3F4 levels of Tm3+ and the 2F5/2 level of Yb3+ were investigated after short resonant excitation into these levels in YAG:Tm, Yb crystals. We observed upconversion fluorescence with a fast cooperative process followed by a slower step-by-step-process.



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