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Absorption spectra of (a) undoped (b) , co-doped, and (c) -doped sodium tellurite glasses. The glasses represented by curves (a) and (b) were melted in air and that by curve (c) was melted in helium atmosphere. The sharp transitions of are superimposed on the broad parabolic background absorption produced by the charged defects in the glass. The peaks are identified with the spectral terms of the upper levels. The ground state of is . To unravel the 580 nm peak in curves (b) and (c), the signal averaging time was increased and signal bandwidth was increased for the recordings (d) and (e), respectively, in the inset. The labels of the inset are same as those of the main figure.
Fluorescence spectra of (a) europium-doped (Sample 2) and (b) undoped (Sample 4) glasses observed under 580 nm dye laser excitation. The spectrum of the undoped glass marked with (b) is multiplied for display in the same figure with that of .
Multiple hole burning in europium-doped sodium tellurite glass (Sample 2). Laser power is 290 mW and time of exposure is 5 min at each wavelength. The inset shows the difference spectrum obtained by subtracting the excitation spectra recorded before and after hole burning.
ESR spectrum of (a) standard (b) undoped (c) -doped and (d) , co-doped glasses observed at 77 K. Microwave frequency and power are, respectively, 9.039 GHz and 2 mW. The values of the signals are marked in the figure.
Comparison of the salient features of different glasses.
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