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Three new heptamethine pyrylium dyes containing a disubstituted amino group on the meso position intheir bridged chain were investigated. The solutions of the dyes in 1,2-dichloroethane (DCE) ofconcentration ca. 10 -3  M act as laser dyes transversely pumped by a Q-switched Nd:YAG laser as apumping source. 5.6 to 9.6% of the pump energy was converted to an intense infrared pulse withfrequencies between 6580 cm -1  (1.52 µm) and 7690 cm -1  (1.30/µm). The relation between lasing efficiency and dye concentration was also studied. These dyes show a remarkable photostability upon 1.06µm laser excitation and excellent storage stability without degassing.

Some Novel Infrared Laser Dyes of Superior Photostability Tunable From 1.30 to 1.52 µm