Effect of Alkaline-Earth Metal Composition on Spectroscopic Properties of Er~(3+) in Fluorophosphate Glasses

摘要

Optical Spectroscopic properties of Er~(3+)-doped alkaline-earth metal modified fluoropho sphate glasses have been investigated experimentally for developing broadband fiber and planar amplifiers. The results show a strong correlation between the alkaline-earth metal content and the Spectroscopic parameters such as absorption and emission cross sections, full widths at half-maximum and Judd-Ofelt intensity parameters. It is found that strontium ions could have more influences on the Judd-Ofelt intensity parameters and the absorption and emission cross sections than other alkaline-earth metal ions such as Mg~(2+), Ca~(2+), Ba~(2+). The sample containing 23 mol% strontium fluoride exhibits the maximum emission cross section of 7.58 x 10~(-21) cm~2, the broadest full width at half-maximum of 65 nm and the longer lifetime of 8.6 ms among the alkaline-earth metal modified fluorophosphates glasses studied. The Judd-Ofelt intensity parameter Ω_6s, the emission cross sections and the full widths at half-maximum in the Er~(3+)-doped fluorophosphate glasses studied are larger than in the silicate and phosphate glasses.