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Abstract
Three new heptamethine thiapyrylium dyes containing a disubstituted amino group on the meso position in their bridged chain were investigated. 4.30 to 5.10% of the pump energy was converted to an intense infrared pulse with wavelength between 1.35 and 1.65 μm. The relation between lasing efficiency and dye concentration was also studied. These dyes show a remarkable photostability upon 1.06 μm laser excitation and excellent storage stability without degassing.
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