Optical Transition Probability of Sm³⁺ Ions in a Polymer Optical Fiber

We investigate optical absorption and emission spectra of Sm³⁺ ions in Sm(DBM)₃Phen-doped polymethyl methacrylate (PMMA). Based on the Judd-Ofelt theory, the optical intensity parameters are calculated to be Ω₂ = 13.76 x 10^-20cm², Ω₄ = 3.41 x 10^-20cm², Ω₆ = 4.01 x 10^-20cm²3 Phen-doped polymethyl methacrylate. The optical intensity parameters have been used to calculate the total radiative transition rate (676.57 s^-1) and radiative lifetime (147 μs) of the ⁴G_5/2 exciting state. The stimulated emission cross-sections σ_ij and the fluorescence branch ratios for the ⁴G_5/2 → ⁶F_J' and ⁴G_5/2 → ⁶F_J' transitions are also evaluated. The analysis reveals that Sm(DBM)₃Phen-doped PMMA is promising for applications in rare-earth-doped polymer devices.