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Refractive Index and Low Dispersion Properties of New Fluorophosphate Glasses Highly Doped with Rare-Earth Ions

Published online by Cambridge University Press:  03 March 2011

J.H. Choi ,
F.G. Shi ,
A. Margaryan  and
A. Margaryan
J.H. Choi*
Affiliation:
OptoElectronic Integration and Packaging Laboratory, Department of Chemical Engineering and Materials Science, University of California, Irvine, California 92697
F.G. Shi*
Affiliation:
OptoElectronic Integration and Packaging Laboratory, Department of Chemical Engineering and Materials Science, University of California, Irvine, California 92697
A. Margaryan
Affiliation:
AFO Research Inc., Glendale, California 91209
A. Margaryan
Affiliation:
AFO Research Inc., Glendale, California 91209
*
a)Address all correspondence to these authors. e-mail: [email protected]
b)Address all correspondence to these authors. e-mail: [email protected]
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Abstract

A new series of 0.4MgF2–0.4BaF2–0.1Ba(PO3)2–0.1Al(PO3)3 glasses highly doped with rare-earth dopants (RE; Nd2O3, Er2O3, and Yb2O3) have been successfully developed for laser applications. Linear refractive index, dispersion properties including Abbe number (ν), dispersion parameter (A′, B′), electronic osciallator energy (Eo), and electronic osciallator strength (Ed) were determined as a function of RE dopants. The refractive index (nD=1.5872 to 1.6047) was found to linearly increase with dopant concentrations irrespective of types of rare earth dopants, while the Abbe number (ν = 65.7 to 68.8) and dispersion parameters including A′ (∼62), B′, Eo (13 ± 0.5 eV), and Ed (19 ± 1 eV) exhibit a concentration independence. It is remarkable that the refractive index of those new glasses increased with increasing RE dopant concentration, while the relatively large Abbe number of those glasses was independent of dopant concentration. The dependence of refractive index (n) on RE cations with high polarizabilities are discussed in terms of molar volume (Vm) and molar refractivity (Rm). Electronic oscillator strengths (Ed), the average electronic energy gap (Eo), and their respective dependence on RE dopant concentration were also investigated using linear refractive index (n) and Abbe number (ν). Those results suggest the present new series of glasses are strong candidates for stable laser hosts with extremely low dispersion.

Keywords

GlassOptical properties
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 1 , January 2005 , pp. 264 - 270
Copyright
Copyright © Materials Research Society 2004

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