Efficient and stable dye laser action from modified dipyrromethene BF2 complexes

3 pages, 2 figures, 1 table.-- The materials described in this letter and their utilization in solid-state dye lasers are covered by Spanish Patent No. 9 901 540, filed on July 9, 1999.-- PACS: 42.55.Mv; 42.60.LhWe report on the lasing action of modified dipyrromethene BF2 complexes in air-equilibrated liquid solutions. All recent dyes share a common chromophore core and were dissolved in apolar, polar nonprotic, and polar protic solvents. When pumped transversely at 534 nm, nearly solvent-independent laser emission was obtained with efficiencies well over 40% in most cases. Highest lasing efficiency was 59%. Under continuous ultraviolet irradiation some of these dyes demonstrated improved photostability as compared with commercial dye pyrromethene 567.This work was supported by Project No. MAT2000- 1361-C04-01 of the Spanish CICYT.Peer reviewe