Up conversion processes in yttrium-lithium-flouride crystals co-doped with erbium and ytterbium ions

B Spinger; Valery P. Danilov; Alexander M. Prokhorov; L O Schwan; D Schmid

doi:10.1117/12.475334

12 July 2002 Up conversion processes in yttrium-lithium-flouride crystals co-doped with erbium and ytterbium ions

B Spinger, Valery P. Danilov, Alexander M. Prokhorov, L O Schwan, D Schmid

Proceedings Volume 4766, XI Feofilov Symposium on Spectroscopy of Crystals Activated by Rare-Earth and Transition Metal Ions; (2002) https://doi.org/10.1117/12.475334
Event: XI Feofilov Symposium on Spectroscopy of Crystals Activated by Rare-Earth and Transition Metal Ions, 2001, Kazan, Russian Federation

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.

Citation Download Citation

B Spinger, Valery P. Danilov, Alexander M. Prokhorov, L O Schwan, and D Schmid "Up conversion processes in yttrium-lithium-flouride crystals co-doped with erbium and ytterbium ions", Proc. SPIE 4766, XI Feofilov Symposium on Spectroscopy of Crystals Activated by Rare-Earth and Transition Metal Ions, (12 July 2002); https://doi.org/10.1117/12.475334

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