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Local structure around Yb 3+ ions in Yb-P-doped silica glasses and its P concentration dependence were elucidated by EXAFS measurements. Yb-O coordination number was found to change from 4 → 8 → 6 → 7 ∼ 8 with increasing the atomic ratio P/Yb. This strange change can be corresponded to the local structure changes in the order of YbPO 4 -like, Yb(PO 3 ) 3 -like to YbP 5 O 14 -like local structures. This correspondence is supported by various optical measurements, such as the Rayleigh/Mie scattering, Raman scattering, absorption cross-section, CT transition, and X-ray induced defect formation, which were also found to depend on P/Yb. These results provide a guideline of the suitable P concentration in RE-P-doped silica glasses for various applications.

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