Dye laser pumped by an He–Sr recombination laser

Lasing was achieved in solutions of coumarin 7 (coumarin 535) pumped by an He–Sr recombination laser (430.5 nm). Jet and cell versions of the dye laser were used. The average output power of the jet laser was 15 mW, whilst that of the cell laser was 30 mW. The tuning range was 499–557 nm and the conversion efficiency was ~ 5%. A distinguishing feature, compared with dye lasers pumped by a copper vapor laser, was that the duration of the lasing pulse was an order of magnitude greater ( ~ 0.2 μs).