Optical amplifiers

Broadband NIR photoluminescence from Bi-doped Ba$_2$P$_2$O$_7$ crystals: Insights into the nature of NIR-emitting Bismuth centers

We report on a novel type of Bi-doped crystal that exhibits ultrabroadband photoluminescence in the near infrared (NIR). Emission centers can be generated and degenerated reversibly by annealing the material in CO atmosphere and air, respectively, …