title: Spectroscopic characteristics of Sm3+-doped alkali fluorophosphate glasses.
abstract: Optical absorption, luminescence and lifetime measurements of Sm(3+)-doped alkali fluorophosphate glasses with molar compositions of 50(NaPO(3))(6)+10TeO(2)+20AlF(3)+19RF+1Sm(2)O(3) (R=Li, Na and K) are described. The variation of optical properties with glass composition plays a dominant role in the determination of efficient laser materials. From the experimental oscillator strengths of f-f electric dipole transitions, the phenomenological Judd-Ofelt parameters have been evaluated and are used to evaluate radiative parameters such as radiative transition probabilities (A(R)), branching ratios (beta(R)), lifetimes (tau(R)) and integrated absorption cross-section (sigma(a)) for various excited levels. The predicted values of tau(R) and beta(R) from the (4)G(5/2) excited level to its lower levels are compared with the experimentally measured values. Stimulated emission cross-sections (sigma(e)) were also determined for (4)G(5/2)-->(6)H(J) (J=5/2, 7/2, 9/2 and 11/2) emission transitions. From the emission transitions of Sm(3+) in these alkali tellurofluorophosphate glasses certain potential laser transitions have been identified.
authors.affiliation: Spectroscopic Laboratories, Department of Physics, Sri Venkateswara University, Tirupati 517502, India.
authors.forename: M
authors.initials: M
authors.lastname: Jayasimhadri
authors.forename: L R
authors.initials: LR
authors.lastname: Moorthy
authors.forename: S A
authors.initials: SA
authors.lastname: Saleem
authors.forename: R V S S N
authors.initials: RV
authors.lastname: Ravikumar
mesh_terms: D005459:Fluorides / Q000737:chemistry*; D005898:Glass; D007477:Ions; D015233:Models, Statistical; D009991:Oscillometry; D010710:Phosphates / Q000737:chemistry*; D012493:Samarium / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods*; D013053:Spectrophotometry / Q000379:methods*; D013997:Time Factors; D014466:Ultraviolet Rays
chemical_list: D007477:Ions; D010710:Phosphates; C012980:fluorophosphate; D012493:Samarium; D005459:Fluorides