Enhancement of photoluminescence (PL) of Gd3+-doped silica glass densified by rapid thermal treatment (RTT) in the ultraviolet (UV) is investigated. The strong emission at 314 nm is assigned to the 6P7/2 to 8S7/2 transition under excitation of 6DJ, 6IJ, and 6PJ energy levels of the Gd3+. Significant decrease of the loss covering the UV band is observed.

© 2017 Optical Society of America

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