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Up conversion processes in yttrium-lithium-flouride crystals co-doped with erbium and ytterbium ions
Author(s): B Spinger; Valery P. Danilov; Alexander M. Prokhorov; L O Schwan; D Schmid
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Paper Abstract

We report on studies of the up-conversion process in YLiF4 single crystals co-doped with Er3+ and with Yb3+. Er3+ has a well known complicated energy level system within the 4f shell which gives rise to the up- conversion process. Yb3+ with a broad absorption band int eh regime 940 nm <EQ (lambda) <EQ 1000 nm essentially represents a two level system which absorbs IR light. It can transfer the absorbed energy resonantly to the Er3+ system thereby increasing the quantum efficiency of the up- conversion process considerably. We have performed steady state and time-resolved measurements of emission and absorption spectra as well as luminescence excitation spectra following either excitation with a light emitting diode, a laser diode or a pulsed dye laser. We have tried to trace some of the channels for energy transfer, relaxation and up-conversion and to optimize the system for an optimum up-conversion efficiency. At optimum conditions we can estimate quantum yields for up-conversion of RI to green light in the order of about 2.5 to 3 percent. Three-step up- conversion to UV emission is also observed. These observation suggest that YliF4 single crystal co-doped with Er3+ and with Yb3+ may be considered as suitable candidates for diode-laser-pumped displays and for solid state laser system int eh visible and near UV region.

Paper Details

Date Published: 12 July 2002
PDF: 13 pages
Proc. SPIE 4766, XI Feofilov Symposium on Spectroscopy of Crystals Activated by Rare-Earth and Transition Metal Ions, (12 July 2002); doi: 10.1117/12.475334
Show Author Affiliations
B Spinger, Univ. Duesseldorf (Germany)
Valery P. Danilov, General Physics Institute (Russia)
Alexander M. Prokhorov, General Physics Institute (Russia)
L O Schwan, Univ. Duesseldorf (United States)
D Schmid, Univ. Duesseldorf (Germany)

Published in SPIE Proceedings Vol. 4766:
XI Feofilov Symposium on Spectroscopy of Crystals Activated by Rare-Earth and Transition Metal Ions
Alexander A. Kaplyanskii; Boris Z. Malkin; Sergey I. Nikitin, Editor(s)

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