Spectroscopic Properties of Er3+ Doped Li2O-Al2O3-BaOP2O5 and Na2O-Al2O3-BaO-P2O5 Glasses for Fiber Optic
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Erbium doped phosphate glasses with Li₂O-Al₂O₃-BaO-P₂O₅-Er₂O₃ (Li glass) and Na₂O-Al₂O₃-BaO-P₂O₅-Er₂O₃ (Na glass) composition were produced using the melt-quench method to determine their spectroscopic properties. The optical absorption and fluorescence spectra were used to analyze the spectroscopic properties. The Judd-Ofelt intensity parameters Omega (lambda = 2, 4, 6) were determined from the absorption band intensities. The (Omega)2 parameter of a LABPEr glass is 1.50 x 10^-20 cm² that of a glass of s NABPEr glass is 0.41 x 10^-20 cm² , which of the LABPEr glass is higher than the NABPEr glass. The radiative transition probability (AR) of LABPEr and NABPEr are 133.03 and 80.38 s ^-1 , respectively. In predicting the emission cross-section (Sigma)e of ⁴ I_13/2 =>⁴ I_15/2 transition from the absorption cross-section (Sigma)a of ⁴ I_15/2 => ⁴ I_13/2 transition for Er³⁺ ions, the McCumber theory has been adopted. At 1.54 nm, intense broad infrared fluorescence was detected under 980 nm excitation. The optical gain G(k) properties can be derived from the (Sigma)a and (Sigma)e values that the gain is positive for 50% population inversion in the 1536–1640 nm wavelength range.