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Abstract
Three new heptamethine pyrylium dyes containing a disubstituted amino group on the meso position in their bridged chain were investigated. The solutions of the dyes in 1,2‐dichloroethane (DCE) of concentration ca. 10-3 M act as laser dyes transversely pumped by a Q‐switched Nd:YAG laser as a pumping source. 5.6 to 9.6% of the pump energy was converted to an intense infrared pulse with frequencies 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 1.06 µm laser excitation and excellent storage stability without degassing.
Highlights
The stability of infrared-absorbing pyrylium dyes has been considerably improved by suitable rigidization of the molecular structure
Tunable emission between 1.2 and 1.32/xm with a pulse duration of 3 ps has been demonstrated in a conventional linear cavity configuration, synchronously pumped by a mode-locked Nd:YAG laser.[3]
Energy conversion efficiency of the dye studied is sensitive to the concentration of the dye solution
Summary
Shanghai Institute of Optics and Fine Mechanics, Academia Sinica, Shanghai, People’s Republic of China (Received 11 October, 1989). Three new heptamethine pyrylium dyes containing a disubstituted amino group on the meso position in their bridged chain were investigated. The solutions of the dyes in 1,2-dichloroethane (DCE) of concentration ca. 10-3 M act as laser dyes transversely pumped by a Q-switched Nd:YAG laser as a pumping source. 5.6 to 9.6% of the pump energy was converted to an intense infrared pulse with frequencies between 6580 cm-1 (1.52/zm) and 7690 cm-1 (1.30/zm). The relation between lasing efficiency and dye concentration was studied. These dyes show a remarkable photostability upon 1.06 /m laser excitation and excellent storage stability without degassing.
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