Studies of new dyes for green-blue spectral range of laser action

Spectral, fluorescent and lasing properties of a series of benzopyran derivatives were investigated for the purpose of making new active media for flashlamp-pumped dye lasers. The influences of structure changes in this series of the dyes on their spectroscopic characteristics and the laser performance have been analyzed in the work. The fulfilled measurements have shown, that laser efficiency of investigated salts of the benzopyran derivatives exceeds one for their analogue-coumarin 7. Therewithal the compounds, in which molecular structure the free diethylamino group in the 7-th position of the benzopyran nucleus is fixed with two saturated six-membered heterocycles, have the greatest laser output. The results of the work allow developing recommendations for synthesis of new effective laser dyes among compounds of the investigated series