Source: http://aoot.osa.org/ome/abstract.cfm?uri=ome-9-3-1233
Timestamp: 2019-04-26 00:02:27+00:00

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Tm3+-doped fluorophosphate glasses with varying Ba(PO3)2 content were prepared by the melt quenching technique and their thermal and optical properties were investigated by studying differential scanning calorimetry, Raman spectra, fluorescence spectra, decay curves, transmission and absorption spectra. The Judd-Ofelt theory was applied to calculate the intensity parameters of the resultant glass. The glass forming criterion was obtained to be 146 °C. The gain coefficient and fluorescence lifetime of Tm3+-doped fluorophosphate glass with 20 mol% Ba(PO3)2 were 3.045 × 10−21 cm2 × ms and 0.406 ms, respectively, which are the highest value among the fluorophosphate glasses with similar components to the best of our knowledge. These results clearly indicate that the prepared fluorophosphate glass is an attractive candidate for 2 μm lasers and as a gain media for optical amplifier applications.
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Fig. 1 DSC curves of FP20 sample.
Fig. 2 Raman spectra of FP20-FP60 samples.
Fig. 3 Absorption spectra of FP20-FP60 samples. Inset shows the variation of integral absorption intensities of 3H6→3F4 transition with the change in Ba(PO3)2 content.
Fig. 4 (a) Infrared transmission spectra of FP20-FP60 samples, (b) The variation of OH- absorption coefficient as a function of Ba(PO3)2 content.
Fig. 5 Fluorescence spectra of FP20-FP60 samples.
Fig. 6 Absorption and emission cross-section of FP20 sample.
Fig. 7 Fluorescence decay curves for the 3F4 level of FP20-FP60 samples.
Fig. 8 Gain coefficient curves for different values of the population inversion for the FP20 sample. The inset is the maximum gain coefficients of FP20-FP60 samples.
Table 1 Characteristic temperatures of FP glasses with different Ba(PO3)2 content.
Table 3 Calculated line strengths for electric-dipole transition (Sed), Transition probabilities (Arad), branching ratios (β), and radiative lifetime (τR) of FP20.
Table 4 The calculated emission cross-section σ em , measured lifetime τ m and σ em × τ m of 3F4→3H6 transition of FP20-FP60 samples.
Characteristic temperatures of FP glasses with different Ba(PO3)2 content.
Calculated line strengths for electric-dipole transition (Sed), Transition probabilities (Arad), branching ratios (β), and radiative lifetime (τR) of FP20.
The calculated emission cross-section σ em , measured lifetime τ m and σ em × τ m of 3F4→3H6 transition of FP20-FP60 samples.

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