Optical absorption, fluorescence and decay properties of Pr-doped PbO-H3BO3-TiO2-AlF3 glasses |
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Authors: | B.C. Jamalaiah A. Mohan Babu Kiwan Jang M. Jayasimhadri Hyukjoon Choi |
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Affiliation: | a Department of Physics, Sri Venkateswara University, Tirupati 517 502, India b Department of Physics, Changwon National University, Changwon 641-773, Republic of Korea c Department of Physics, Pukyong National University, Busan 608-737, Republic of Korea d Korea Institute of Curriculum & Evaluation, Seoul 110-230, Republic of Korea |
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Abstract: | Spectroscopic and laser properties of PbO-H3BO3-TiO2-AlF3 glasses doped with 0.1, 0.5, 1.0 and 2.0 mol% of Pr6O11 have been studied. Optical absorption spectra were recorded in the UV-vis-NIR regions and the observed absorption bands were assigned to different electronic transitions from 3H4 ground state of 4f2 configuration. The three phenomenological Judd-Ofelt (J-O) parameters Ωt (t=2, 4, 6) were determined from the measured oscillator strengths by including as well as excluding the 3H4→3P2 hypersensitive transition in J-O analysis. The emission characteristics such as stimulated emission cross-sections (σe), measured branching ratios (βm), measured lifetimes (τm), quantum efficiencies (η) and gain parameters (σe×τm) have been evaluated for the principal intermanifold transitions of Pr3+ from the 3P0 and 1D2 states to the lower lying manifolds in the visible region. From the emission and decay measurements, the effect of Pr3+ ion concentration on the quenching of the 1D2 measured lifetimes has been discussed. |
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Keywords: | Luminescence Glasses Decay times Cross relaxation |
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