Dyestuff laser

• US 4,274,062 A
• Filed: 01/03/1978
• Issued: 06/16/1981
• Est. Priority Date: 01/05/1977
• Status: Expired due to Term

• Current Assignee: Bayer AG
• Original Assignee: Bayer AG
• Inventors: Brinkmann, Uwe, Raue, Roderich, Telle, Helmut, Schellhammer, Carl-Wolfgang
• Primary Examiner(s): Larkins, William D.
• Application Number:
  US05/866,522
• Time in Patent Office: 1,260 Days
• Field of Search: 331/94.5 L, 252/301.17
• US Class Current: 372/53
• CPC Class Codes: H01S 3/213 including an organic dye

Abstract

Laser light in the wavelength range of 400 - 480 Nm is obtained with a dyestuff laser containing a dyestuff of the general formula ##STR1## wherein E denotes one of the radicals ##STR2## R₁ -R₄ independently of one another denote hydrogen, alkyl, trifluoromethyl, alkoxy, aralkoxy, halogen, alkenyloxy, the carboxyl, cyano, alkylsulphone, arylsulphone, carboxamide or sulphonamide group or the carboxylic acid ester group, or R₁ and R₂, or R₃ and R₄, conjointly represent a fused benzene ring and m and n independently of one another denote 0, 1 or 2, with the proviso that the radical E contains at least one sulphonic acid group if m and n represent 0,

and wherein

the radical E can be further substituted, in a solvent which does not interfere with the emission, at a concentration, which emits laser beams, of, preferably, 10^-2 to 10^-5 mols/liter.

Claims

1. Dyestuff laser consisting of a reservoir, with a laser dyestuff solution contained therein, and a pump light source connected thereto, which is capable of exciting the dyestuff solution to produce an emission, characterised in that the dyestuff solution contains a dyestuff which, in the form of the free acid corresponds to the formula ##STR10## wherein R₁ '"'"' and R₃ '"'"' independently of one another represent hydrogen, methyl or chlorine and

n'"'"' and p each represent 1,

in a solvent which does not interfere with the emission, at a concentration, which emits laser beams, of, preferably, 10^-2 to 10^-5 mols/liter.

2. A dyestuff laser according to claim 1 which in the free acid form has the following formula:

##STR11##

3. Dyestuff laser consisting of a reservoir, with a laser dyestuff solution contained therein, and a pump light source connected thereto, which is capable of exciting the dyestuff solution to produce an emission, characterised in that the dyestuff solution contains a dyestuff which, in the form of the free acid corresponds to the formula ##STR12## in a solvent which does not interfere with the emission, at a concentration, which emits laser beams, of, preferably, 10^-2 to 10^-4 mols/liter.

4. A process for producing an emission which comprises pumping light into a reservoir containing a laser dyestuff solution, the dyestuff of said solution being one which, in the form of the free acid corresponds to the general formula ##STR13## wherein R₁ '"'"' and R₃ '"'"' independently of one another represent hydrogen, methyl or chlorine and

n'"'"' and p each represent 1,

whereby there is produced a coherent laser emission in the wave length range of 400 to 480 nm.

5. A process according to claim 4 wherein the dyestuff in the free acid form corresponds to the formula:

##STR14##

6. A process for producing an emission which comprises pumping light into a reservoir containing a laser dyestuff solution, the dyestuff of said solution being one which, in the form of the free acid corresponds to the general formula ##STR15## wherein there is produced a coherent laser emission in the wave length range of 400 to 480 nm.