Discovery generation of new laser dyes on the basis of quinolisinocoumarin's derivatives in a spectral range 490-580 nm. It is exhibited, that the greatest generative efficiency and photodurability the availability for given compoundes in the third standing coumarin's basis of the strong electron acceptor, for example carbamyl-, benzimidozoli- and benzthiazolyl-groups, and in a standing seven - electron donor N-(CH2) 6 groups. Given quinolisinocoumarin's derivatives have high generative efficiency which exceeds known laser dyes in 2-3 times. Thus the photochemical
stability exceeds rhodamine 6G on the order.
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