Geometric and Optical Properties of Cluster Model of Yb-doped Silica Optical Fiber
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Based on the 6-membered ring cluster model, geometric and optical properties of cluster model of Yb-doped silica optical fiber is researched by using first-principles calculations. It can be revealed that the interstitial Yb-doped model is geometrically and optically closer to the local structures of Yb-doped silica optical fibers. In interstitial Yb-doped model, the coordination number of Yb to O is 6, and the oscillator strengths of excited levels are stronger than the substitutional Yb-doped model. We construct the Yb–Al co-doped and Yb–P co-doped models based on the interstitial Yb-doped model, and calculate the absorption spectra of these co-doped models. It can be proposed that co-doping with Yb and Al is responsible for the ~ 1030 nm absorption.
KeywordsFirst-principles Cluster model Energy levels Absorption spectra
This work was supported by the Open Program of State Key Laboratory of Functional Materials for Informatics. We acknowledge the computational support from the Beijing Computational Science Research Center (CSRC).
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