Judd–Ofelt analysis of spectroscopic properties of Nd3+-doped novel fluorophosphate glass

 

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

 

OptoElectronic Packaging and Materials Lab., Department of Chemical Engineering and Material Science, University of California, 916 Engineering Tower, Irvine, CA 92697-2575, USA

AFO Research Inc, Glendale, P.O. Box 1934, CA 91209, USA

 

Received 13 May 2004;  revised 5 October 2004;  accepted 17 December 2004.  Available online 31 May 2005.

 

 

Abstract

 

Judd–Ofelt analysis is performed for the new MgF2–BaF2–Al(PO3)3–Ba(PO3)2-based glass system to evaluate the spontaneous emission probability as well as quality factor and branching ratio. The variation of intensity parameters Ω2, Ω4, and Ω6 are analyzed as a function of Nd2O3 concentration. It is found that the efficiency for the 4F3/2→4I9/2 transition enhances and the efficiency for the 4F3/2→4I11/2 transition diminishes as the difference between Ω4 and Ω6 increases with an increase in Nd2O3 concentration. The emission cross section for the 4F3/2→4I13/2 transition varies from 1.1×10−20 to 1.15×10−20 cm2, and for the 4F3/2→4I11/2 transition it varies from 2.97×10−20 to 2.69×10−20 cm2 with an increase in Nd2O3 concentration from 1 to 5 wt%. Analysis on non-radiative decay is performed based on multiphonon relaxation mechanisms. The above results are also compared with those of other host glass materials with the similar Nd3+ dopant concentration, which suggests that present new glass is promising for fiber laser applications.

 

Keywords: MgF2–BaF2–Al(PO3)3–Ba(PO3)2 glass system; Judd–Ofelt theory; Emission cross-section; Multiphonon relaxation

 

PACS: 42.70.Ce; 61.43.Fs; 78.55.Qr