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Influence of Nd 3+ concentration on its optical absorption and luminescence properties in potassium borate glass
Author(s) -
Ratnakaram Y. C.,
Abdul Altaf Md.,
Chakradhar R. P. S.,
Rao J. L.,
Ramakrishna J.
Publication year - 2003
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200301353
Subject(s) - analytical chemistry (journal) , excited state , boron , borate glass , radiative transfer , luminescence , absorption (acoustics) , absorption spectroscopy , potassium , emission spectrum , spectral line , chemistry , materials science , atomic physics , optics , physics , optoelectronics , organic chemistry , chromatography , astronomy , composite material
Spectroscopic and laser properties of Nd 3+ doped potassium borate glass have been studied for different Nd 3+ concentrations ranging from 0.5 to 2.0 mol%. From the absorption spectra, optical band gaps ( E opt ) and various spectroscopic parameters ( E 1 , E 2 , E 3 , ξ 4f and α ) are determined. Using Judd‐Ofelt intensity parameters Ω 2 , Ω 4 and Ω 6 , radiative lifetimes ( τ R ), branching ratios ( β ) and integrated absorption cross sections ( Σ ) have been calculated for certain excited states of Nd 3+ for all the Nd 3+ concentrations. From the spectral profiles of the hypersensitive transition, it is observed that there is slight change in the environment of Nd 3+ ion in different concentrations of Nd 3+ doped potassium borate glass. The radiative lifetimes ( τ R ) for certain excited levels are minimum when the concentration is high. From the emission spectra, peak wavelengths ( λ p ), effective line widths (Δ λ eff ) and stimulated emission cross‐sections ( σ p ) have been obtained for the three transitions 4 F 3/2 → 4 I 9/2 , 4 F 3/2 → 4 I 11/2 and 4 F 3/2 → 4 I 13/2 of Nd 3+ and are compared for different concentrations.