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The first, somewhat furtive, signal from element 63 was recorded in 1885 by Sir William Crookes, who found an anomalous red line (609 nm) in the emission spectrum of a samarium sample.

“We report on the first visible orange samarium laser directly pumped by a blue 465 nm GaN semiconductor laser diode,” wrote Alain Braud and colleagues in the abstract of the paper. “Our work ...