Dyestuff laser

US4670882A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Helmut Telle · Cologne, DE
• Rudolf Schieder · Gerstungen, DE
• Roderich Raue · Dover, US
• Udo Eckstein · Cologne, DE

Key dates

• Filing date: Feb 18, 1982
• Grant date: Jun 2, 1987
• Expiry date: Feb 18, 2002

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01S3/213
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Dyestuff laser consisting of a reservoir, with a laser dyestuff solution contained therein, and a pumped light source associated therewith, which is capable of exciting the dyestuff solution to produce an emission, characterized in that the dyestuff solution contains, in a solvent which does not interfere with the emission, a dyestuff which, in the form of the free acid, corresponds to the general formula ##STR1## wherein R.sub.1 to R.sub.4 independently of one another represent hydrogen, alkyl, trifluormethyl, alkoxy, aralkoxy, alkenyloxy, halogen or the carboxyl, cyano, alkylsulphone, aryl-sulphone, carboxamide, sulphonamide or carboxylic acid ester group, PA1 R.sub.1 and R.sub.4 can additionally denote a fused-on benzene ring, PA1 n represents a number 2 to 6 and PA1 o, p, q and r independently of one another represent 0, 1 or 2, in a concentration, preferably of 10.sup.-2 to 10.sup.-5 mol/1, which emits laser radiation.