Role of TeO 2 coordination with the BaF 2 and Bi 2 O 3 on structural and emission properties in Nd 3+doped fluoro phosphate glasses for NIR 1.058 μ m laser emission

Fluoro phosphate glasses with different contents of barium and bismuth (8, 11, 14, 17 and 20 mol %) doped with Nd3+ were prepared by melt quenching technique. Importance of these modifier ions on structural transformation were carried out using XRD, FTIR, FT-Raman and 31P MAS NMR characterizations. 31P MAS NMR spectra revealed that structural modifications due to Bi2O3 are more when compared with BaF2 in this fluoro phosphate glass matrix. Three phenomenological Judd-Ofelt (J-O) parameters OX (X = 2, 4, 6) have been derived from the absorption spectra of Nd3+ doped barium and bismuth fluoro phosphate glasses. From the Judd-Ofelt parameters, transition probabilities (A), branching ratios (8) of certain transitions and radiative lifetimes of certain excited states of Nd3+ are extracted and reported. From the emission spectra, emission cross sections (cre), band gains (crexAXeff) and optical gain parameters (crextR) were reckoned for the observed emission bands in these phosphate glasses. It is observed that barium glass resulted higher laser spectroscopic parameters (cre, crexAXeff, crextR) which are crucial characteristics for exploring promising laser applications. Impact of Ba2+ and Bi3+ on luminescent properties of Nd3+ doped fluoro phosphate glasses has been examined in search of solid sate gain medium for laser emitting NIR light around 1.058 mu m for photonic applications.

Automated summary

Fluoro phosphate glasses doped with different levels of barium and bismuth were characterized for their structural modifications using various techniques. It was found that barium glass exhibited higher laser spectroscopic parameters, indicating its potential for promising laser applications. The impact of Ba2+ and Bi3+ on the luminescent properties of Nd3+ doped fluoro phosphate glasses was examined for potential use as a gain medium for emitting NIR light in photonic applications.