3-3E03 ガラス中の希土類イオンの電子状態と Nd^<3+>1.3μm、 Er^<3+>1.5μm 発光の f-f 遷移確率

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The Judd-Ofelt Ω_t parameters were determined for Nd^<3+> and Er^<3+> ions in Several glasses. The Nd^<3+> 1.3μm and Er^<3+> 1.5μm emissions, which can be used for optical amplification in fiber telecommunication, are dominated by the value of Ω_6. From the ^<151> Eu Mossbauer measurements for the equivalent composition, a strong negative correlation was found between the isomer shift of Eu^<3+> and the Ω_6 parameter of Nd^<3+> and Er^<3+> ions. This can be ascribed to the facts that among three Ω_t 'S, the Ω_6 is most affected by the radial integral of 4f and 5d electrons and that with increasing covalency, the 6s electron shields 5d electrons and thus decreases <4f|r^s|5d>.
1993-10-01