Influence of optical basicity on broadband near infrared emission in bismuth doped aluminosilicate glasses

The infrared luminescence with a full width at half maximum larger than 200 nm was observed in aluminosilicate glasses under an 808 nm LD excitation. The influence of optical basicity on broadband near infrared emission was investigated in bismuth doped aluminosilicate glasses. The intensity of the infrared fluorescence decreases with the increase in the optical basicity of the host glasses. On the base of the luminescence spectra, we thought the infrared emission might be attributed to low valence state of bismuth ions in the aluminosilicate glasses. The broadband infrared emission characteristics of the glasses suggest that they are promising candidate for broadband optical fiber amplifiers and tunable lasers. (C) 2011 Elsevier B.V. All rights reserved.