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- Title
Spectral studies of Nd<sup>3+</sup> doped different fluorophosphate glasses for their aptness in laser applications at 1060 nm.
- Authors
Devara, B. Surya Narayana; Ratnakaram, Y. C.; Kumar, M.
- Abstract
Neodymium doped fluorophosphate (FP:Nd3+) glasses with different chemical compositions (59NH4H2PO4+15ZnO +15BaF2+10X+1·0NdF3 (X=LiF, NaF, CaF2, SrF2, AlF3)) were prepared by melt quenching. Their structures and spectroscopic properties were studied using x-ray diffraction, FTIR, FT-Raman and 31P, 27Al MAS NMR techniques. Various structural groups were identified using FTIR and FT-Raman spectra. The depolymerisation of metaphosphate chains are described by the decrease of Q² tetrahedral sites allowing the formation of pyrophosphate groups revealed by 31P MAS NMR spectroscopic studies. Optical properties were studied using absorption and photoluminescence spectroscopy. Judd–Ofelt intensity parameters Ωλ (λ=2, 4 and 6) were estimated from absorption spectra. Radiative parameters such as transition probabilities (A), radiative lifetimes (τR), integrated absorption cross-sections (Σ) and branching ratios (βR) were calculated. Two emission lines at 1060 and 1330 nm were observed for Nd3+ in all the fluorophosphate glasses. From the emission spectra, emission characteristics were studied via optical band gains (σe×τR)and gain bandwidths (σe×Δλeff). Fairly large numerical values for peak emission cross-sections (σe) and branching ratios (β) for 4 F3/2→4 I11/2 transition of Nd3+ ion doped calcium fluorophosphate glass were observed. These results are rosy for NIR laser application at 1060 nm.
- Subjects
BRANCHING ratios; RADIATIVE transitions; OPTICAL properties; ABSORPTION spectra; LASERS
- Publication
Physics & Chemistry of Glasses: European Journal of Glass Science & Technology Part B, 2023, Vol 64, Issue 2, p33
- ISSN
1753-3562
- Publication type
Article
- DOI
10.13036/17533562.64.2.12