期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 699, 期 -, 页码 959-968出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.12.199
关键词
Lead phosphate glasses; Spectroscopic properties; McCumber theory; Gain bandwidth; Upconversion
资金
- University Grants Commission, New Delhi [F.15-1/2011-12/PDFWM-2011-12-OB-AND-9964, 19-13/2014]
- KEPCO Research Institute (KEPRI)
- KESRI, South Korea [KEPRI-16-23]
Er3+-doped lead phosphate glasses (PKAPbNEr) were prepared by a melt quenching technique and their spectroscopic properties were investigated for 1.54 mu m fiber amplifier applications. Judd-Ofelt (JO) analysis was carried out from the absorption spectra of 1.0 mol% Er2O3-doped glass and the derived JO parameters were found to be Omega(2) = 4.7, Omega(4) = 0.7 and Omega(6) = 1.2 (x10(-20) cm(2)). The transition probabilities, branching ratios and radiative lifetimes for several excited states of Er3+ were predicted using JO parameters and refractive index. The stimulated emission-cross section of the green emission (S-4(3/2) -> I-4(15/2)) has been determined to be 3.31 x 10(-21) cm(2). Absorption cross-section (sigma(abs)(lambda)), emission cross-section (sigma(emi)(lambda)) and gain bandwidth (FWHM x (sigma(emi)(lambda)) of I-4(13/2) -> I-4(15/2) transition at 1.54 mu m were deduced from the McCumber theory and found to be 4.97 x 10(-21), 6.63 x 10(-21) and 267 x 10(-28) (cm(2)), respectively. The decay curves exhibit single exponential nature and the lifetimes were determined to be 4.50, 4.57, 2.61, 2.06, 1.48 and 1.04 ms for 0.05, 0.1, 0.5, 1.0, 2.0 and 4.0 mol %, respectively, for Er2O3-doped lead phosphate glasses. The results confirm that the present Er3+-doped lead phosphate glasses could be considered as promising candidates as gain media for photonic applications. (C) 2016 Elsevier B.V. All rights reserved.
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