PHASE-MODIFIED QUASI-NON-DIFFRACTING LASER BEAMS FOR HIGH ANGLE LASER PROCESSING OF TRANSPARENT WORKPIECES

摘要

A method for processing a transparent workpiece that includes directing a laser beam into the transparent workpiece. A portion of the laser beam directed into the transparent workpiece comprises a laser beam focal line and generates an induced absorption to produce a defect within the transparent workpiece. The laser beam focal line includes a wavelength λ, a spot size w_o, a Rayleigh range Z_R that is greater than; $$ F_D\frac{\pi w_o^2}{\lambda },$$ ;where F_D is a value of 10 or greater, and an internal focal line angle of greater than 10°. The laser beam focal line further comprises a circular angular spectrum within the transparent workpiece and a plurality of rays. Each individual ray of the plurality of rays has a same phase, ϕ, when converging to form the circular angular spectrum within the transparent workpiece.