Materials Research Bulletin
Volume 40, Issue 12 , 8 December 2005, Pages 2189-2197

Spectroscopic properties of Yb³⁺ in heavy metal contained fluorophosphate glasses

J.H. Choi, A. Margaryan, Ashot Margaryan and F.G. Shi

Optoelectronic Materials and Packaging Lab., Department of Chemical Engineering and Material Science, University of California, Irvine, CA 92697, USA
AFO Research Inc., Glendale, P.O. Box 1934, CA 91209, USA

Received 8 September 2004; revised 2 April 2005; accepted 30 June 2005. Available online 8 August 2005.

Abstract

A new series of 20Bi(PO₃)₃–10Sr(PO₃)₂–35BaF₂–35MgF₂ doped with Yb³⁺ is introduced for fiber and waveguide laser applications. The stimulated emission cross-section σ_emi, which was found to be 1.37 pm² at the lasing wavelength of 996 nm, is the highest one among fluorophosphate glasses. It has been found that an extremely high gain coefficient of G = 1.65 ms pm⁴ and high quantum efficiency of η = 93% for 1 wt.% Yb₂O₃ doped systems. The various concentration effects on laser performance properties including minimum pumping intensity I_min, the minimum fraction of excited ions β_min and the saturation pumping intensity I_sat are analyzed as a function of Yb₂O₃ concentration. Those results obtained in current system had advantage over some fluorophosphate glasses reported.

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