Effect of alkali (Na/K) on erbium-doped gadolinium oxyfluoride phosphate glasses for broadband optical amplifiers and laser medium materials

초록

Erbium (Er3+)-doped glass materials have been widely studied for their applications in broadband optical amplifiers and solid-state laser media due to their characteristic emission near 1.5 mu m. In this work, a series of gadolinium oxyfluoride phosphate glasses doped with Er3+ ions were synthesized via the conventional melt-quenching method at 1200 degrees C using alumina crucibles. The effects of alkali fluorides (NaF and KF) on the physical, structural, and optical properties of the glasses were systematically investigated. The density and refractive index values were increased when NaF and KF were added to the glass composition. Structural properties like FTIR and XANES spectra were analyzed. All glass samples showed a +3 oxidation state at similar to 8363 eV in the Er L-III-edge white line XANES spectra. Absorption spectra were obtained to analyze J-O parameters and gain coefficients for promising laser applications. The intense emission was shown in the peak of 1.53 mu m excited by 980 nm due to I-4(13/2) -> I-4(15/2) transition. The PLAfNfGdEr(1.0) glass showed the J-O parameter trendline Omega(2)>Omega(6)>Omega(4) and a stimulated emission cross-section of 2.42 x 10(-20) cm(2), which is greater than another present glass. Due to its broad emission profile centered at approximately 1.53 mu m and larger Er3+ ion-stimulated emission cross-section, this material presents a potential for broadband optical amplifiers in the C band.

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