Abstract

Powerful laser output was observed at 381 nm from electron-beam-pumped ternary mixtures of argon-nitrogen and 2,2′-p-phenylinebis(5-phenyloxazole) (POPOP) dye vapor. The injection of the subthreshold 380.5-nm N2 line into the electrically excited gain profile of POPOP vapor has been identified as a pumping mechanism.

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