Luminescence spectra and lasing characteristics of some new coumarins

Luminescence spectral properties and lasing characteristics of ethanol solutions of several 7-diethylaminocoumarins, recently synthesized, have been measured. Specifically, the peaks in the absorption and luminescence spectra, the fluorescence yields, the lasing efficiency, the peak in the lasing spectrum, and the lasing region were measured. When solutions of these dyes are used as laser active media it becomes possible to tune the output wavelength continuously over the spectral interval 450–505 nm. The compounds have a fairly high lasing efficiency.