Abstract
Persistent spectral hole burning has been observed successfully at room temperature in the excitation spectrum for the 7 F 0− 5 D 0 transition of Sm 2+ in silica-based fibers co-doped with Al. The room-temperature persistent spectral hole burning is reported for the first time, to the best of our knowledge, in Sm 2+-doped fiber. The hole width was measured to be about 6 cm −1. The ratio of inhomogeneous to homogeneous linewidths of this system is ∼15.
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