TRANSPARENT MATERIAL TREATMENT BY ULTRA-SHORT PULSE LASER

摘要

PROBLEM TO BE SOLVED: To provide a method for the pulse laser treatment of a material.SOLUTION: A laser-based method for correcting a material comprises: a step of generating a pulse laser input beam having a pulse width shorter than about 100 ps; a step of forming a plurality of converged pulse beams having different polarizations or different wavelengths from the pulse laser input beam; a step of causing relative motions between the material and the converged pulse beams; and a step of controlling the formations and the motions so that a plurality of collinear pulse beams separated from each other in a depth direction and having different polarizations or different wavelengths may reach the material simultaneously during the motions.