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Abstract

Laser light in the wavelength range of 420-480 nm is obtained with a dyestuff laser containing a dyestuff of the general formula ##STR1## wherein R and R.sub.1 independently of one another represent ##STR2## R.sub.2 denotes an optionally substituted alkyl radical with 1-4 C atoms, R.sub.3 and R.sub.4 independently of one another represent hydrogen or optionally substituted C.sub.1 -C.sub.4 -alkyl or conjointly with the nitrogen can form a 5-membered or 6-membered heterocyclic ring and m and n denote 1 or 2, and wherein the aromatic radicals contained in the formula can be further substituted, in a solvent which does not interfere with the emission, at a concentration, which emits laser beams, of, preferably, 10.sup.-2 to 10.sup.-5 mols/liter.

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First Claim