Influence of Various Impurities on the Optical Properties of YbF_3-Doped CaF_2 Crystals

• Authors: M. Stef , A. Pruna , N. Pecingina-Garjoaba , I. Nicoara
• Languages of publication: EN

Abstracts

EN

Calcium fluoride crystals doped with YbF_3 and co-doped with LiF and NaF were grown using the vertical Bridgman method. Several of rare-earth ions (such as Eu, Sm, Ho, Tm, and Yb) can be stabilized in the divalent state in the CaF_2. The change of valence was attained by various methods. The optical absorption spectra reveal the characteristic absorption bands of the Yb^{3+} and Yb^{2+} ions. This means that the developed crystal growth process achieves a good Yb^{3+} to Yb^{2+} conversion in the as-grown crystals. The influence of other impurities, such as Na^+ or Li^+, on the absorption and emission spectrum of YbF_3-doped CaF_2 was studied. The Li^+ and Na^+ ions drastically decrease the absorption coefficient of the Yb^{2+} ions in the UV band and the emission intensity by excitation in 230 nm.

Keywords

EN

52.25.Os; 76.30.Kg; 87.64.kv; 42.55.Rz

Discipline

• 52.25.Os: Emission, absorption, and scattering of electromagnetic radiation
• 87.64.kv: Fluorescence
• 42.55.Rz: Doped-insulator lasers and other solid state lasers
• 76.30.Kg: Rare-earth ions and impurities

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2007
• Volume: 112
• Issue: 5
• Pages: 1007-1012

Dates

published

2007-11

received

2007-09-03

Contributors

author

M. Stef

• Department of Physics, West University of Timisoara, Blvd. V. Parvan 4, Timisoara 300223, Romania

author

A. Pruna

• Department of Physics, West University of Timisoara, Blvd. V. Parvan 4, Timisoara 300223, Romania

author

N. Pecingina-Garjoaba

• Department of Physics, West University of Timisoara, Blvd. V. Parvan 4, Timisoara 300223, Romania

author

I. Nicoara

• Department of Physics, West University of Timisoara, Blvd. V. Parvan 4, Timisoara 300223, Romania

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Identifiers

DOI

10.12693/APhysPolA.112.1007