Patent ID: 11858063
Assignee: CORNING INCORPORATED
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A method for processing a transparent workpiece, the method comprising:
directing a laser beam oriented along a beam pathway into the transparent workpiece, the transparent workpiece having an impingement surface, the laser beam passing through the impingement surface at an impingement location to enter the transparent workpiece,
wherein:
a portion of the laser beam directed into the transparent workpiece produces a laser beam focal line in the transparent workpiece and generates an induced absorption to produce a defect within the transparent workpiece, the laser beam focal line comprising:
a wavelength λ;
a spot size wo;
a Rayleigh range ZR that is greater than, F
   D
  
  ⁢
  
   
    
     π
     ⁢
     
      w
      o
      2
     
    
    λ
   
   ,, where FD is a dimensionless divergence factor comprising a value of 10 or greater;

an internal focal line angle of greater than 10° relative to a plane orthogonal to the impingement surface at the impingement location;
a circular angular spectrum within the transparent workpiece; and
a length defined by a series of points, each of the points being formed from a plurality of intersecting rays from the laser beam, the intersecting rays being matched in phase.