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Spectral Investigations of Er Doped Lead Bismuth Borophosphate Glasses

Different concentrations of Er3+ doped lead bismuth magnesium borophosphate (LBMBPH) glasses with chemical composition of (in mol %) 30 PbO–20Bi2O3-25MgHPO4-(25-x) B2O3–xEr2O3 (x=1.0, 1.5 and 2.0 mol %) were prepared by the melt quenching method. The amorphous nature of these glass samples were confirmed with XRD studies, The spectral data from the optical absorption studies were employed to compute the spectroscopic parameters such as Racah (E1,E2and E3), spin-orbit (ξ4f ), configurational interaction (α), (γ) and Judd-Ofelt intensity parameters (Ωλ, λ= 2,4 and 6). The spectral properties were investigated using the absorption. The experimental oscillator strengths were calculated from the area under the absorption bands. Applying Judd– Ofelt theory, the intensity parameters Ω2, Ω 4 and Ω 6 were calculated, by the least square fit approach from which the radiative transition rates and branching ratios were determined. The radiative parameters such as radiative transition probabilities (A), the total radiative transitional probabilities (AT) , radiative life times (τR) and branching ratios (β) were computed for certain lasing levels. The effect of compositional changes on the optical band gap is also reported. The glass systems thus developed indicate their potential lasing candidature.