Abstract

We discuss the origin of near- to mid-infrared emissions in Bi-doped oxide glasses recently reported [Opt. Lett. 37, 4260 (2012)]. Our detailed analysis indicates that the near- to mid-infrared emissions in the range of 1200–3000 nm peaking at 2500, 2650, and 2700 nm do not result from Bi active centers in the oxide matrix but are due to the selective atmospheric absorption of thermal radiation induced by laser irradiation.

© 2013 Optical Society of America

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