Spectral studies of Nd3+ doped different fluorophosphate glasses for their aptness in laser applications at 1060 nm

IF 0.3 4区 材料科学 Q4 CHEMISTRY, PHYSICAL
B. S. Narayana Devara, Y. C. Ratnakaram, M. Kumar
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引用次数: 0

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 4F3/2Æ4I11/2 transition of Nd3+ ion doped calcium fluorophosphate glass were observed. These results are rosy for NIR laser application at 1060 nm.
掺Nd3+不同氟磷酸盐玻璃在1060nm激光应用的光谱研究
采用熔体淬火法制备了不同化学成分(59NH4H2PO4+15ZnO +15BaF2+10X+1·0NdF3 (X=LiF, NaF, CaF2, SrF2, AlF3))的掺钕氟磷酸盐(FP:Nd3+)玻璃。利用x射线衍射、FTIR、FT-Raman和31P, 27Al MAS NMR技术研究了它们的结构和光谱性质。利用FTIR和FT-Raman光谱鉴定了不同的结构基团。偏磷酸链的解聚合是通过Q2四面体位点的减少来描述的,从而形成了31P MAS NMR光谱研究显示的焦磷酸基团。利用吸收光谱和光致发光光谱对其光学性质进行了研究。利用吸收光谱估计Judd-Ofelt强度参数Ωλ (λ= 2,4和6)。计算了辐射参数,如跃迁概率(A)、辐射寿命(τR)、综合吸收截面(Σ)和分支比(βR)。在所有氟磷酸盐玻璃中均观察到Nd3+在1060和1330 nm处的两条发射线。从发射光谱出发,通过光带增益(σe×τR)和增益带宽(σe×Δλeff)研究了发射特性。掺Nd3+离子氟磷酸钙玻璃的4F3/2Æ4I11/2跃迁峰发射截面(σe)和支化比(β)均有较大的数值。这些结果对1060nm近红外激光器的应用具有积极意义。
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来源期刊
CiteScore
0.70
自引率
33.30%
发文量
0
审稿时长
1 months
期刊介绍: Physics and Chemistry of Glasses accepts papers of a more purely scientific interest concerned with glasses and their structure or properties. Thus the subject of a paper will normally determine the journal in which it will be published.
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