Coumarin 460 transfers radiative energy to disodium fluorescein when solgel silica is doped with the dyes, producing disodium fluorescein lasing in superradiant mode at a 3.3% peak efficiency under low-energy transverse pumping by a 1.5-mJ N<sub>2</sub> laser, with disodium fluorescein being present at a concentration below its lasing threshold value.
© 1998 Optical Society of America
Hong-Kee Law, Teck-Yong Tou, and Seik-Weng Ng, "Energy-Transfer Dye Laser in SolGel Silica," Appl. Opt. 37, 5694-5696 (1998)