Process for producing laser light

• US 3,975,291 A
• Filed: 03/01/1974
• Issued: 08/17/1976
• Est. Priority Date: 03/03/1973
• Status: Expired due to Term

• Current Assignee: Bayer AG
• Original Assignee: Bayer AG
• Inventors: Claussen, Uwe, Oppermann, Gunter
• Primary Examiner(s): Mack, John H.
• Assistant Examiner(s): Weisstuch, Aaron
• Application Number:
  US05/447,210
• Time in Patent Office: 900 Days
• Field of Search: 252/301.2 R, 260/343.2 R, 260/308 A, 260/240.1, 331/94.5 L
• US Class Current: 252/301.17
• CPC Class Codes: H01S 3/20 Liquids
• CPC Class Codes: H01S 3/213 including an organic dye

Abstract

Laser light of different wavelength can be produced by exciting sparingly water soluble fluorescent compounds of which the αα m value is less than 0,300 and of which the molecular symmetry is either of symmetry group C_s or of a higher symmetry group than this, the fluorophor having to form a rigid system if the compound belongs to symmetry group C_s, the compounds being present in concentrations of between 10.sup.^-1 and 10.sup.^-5 mol/l in organic solvents.

Claims

1. Process for producing coherent monochromatic radiation by exciting a 2-(1,2,3)-triazolyl-substituted fluorescent compound in a concentration of 10^-1 to 10^-5 mole/liter in an organic solvent with light of sufficient intensity and wavelength, wherein said fluorescent compound has a water solubility of less than 5 g. in 1 liter of water, a Δ

Δ

m value of less than 0.300, and a molecular symmetry higher than C_s or if the molecular symmetry is of the group C_s the fluorescent compound forms a rigid system.

2. Process of claim 1 in which said organic solvents are nitrogen-free and halogen-free aliphatic compounds liquid below 30°

C or nitrogen-free and halogenfree aromatic compounds which are liquid below 30°

C and which are unsubstituted or substituted by 1st order substituents.

3. Process of claim 1 in which the concentration of the fluorescent compounds is between 10^-3 and 10^-4 mole/liter.