Raman spectra of binary high-silica glasses and fibers containing GeO2, P2O5 and B2O3

Abstract The Raman spectra of binary high-silica glasses have been studied. The main peaks at 808 cm −1 and 710 cm −1 in vitreous B 2 O 3 and vitreous P 2 O 5 , respectively, are greatly reduced in binary high-silica glass, whereas a peak at 425 cm −1 due to GeOGe vibration and a peak at 1320 cm −1 due to P = O vibration remain strong, increasing in intensity with decreasing SiO 2 concentration. In the stimulated Raman spectra of a P 2 O 5 -SiO 2 glass fiber pumped by a mode-locked and Q-switched Nd:YAG laser at 1.064 μm, strong Stokes emissions due to the P = O vibration have been observed at 1.24 μm and 1.48 μm. In the spectra for a GeO 2 -SiO 2 glass fiber, four narrow-width Stokes emissions due to the GeOGe vibration have been observed at 1.115, 1.172, 1.235 and 1.305 μm.

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