Hybrid laser-beam-shaping system for rotatable dual beams with long depth of focus

Abstract

A laser processing system consisting of two diffractive elements and one refractive element is proposed enabling a Gaussian laser beam to be transformed into two beams with a depth of focus of up to 150 mu m and focal spot smaller than 5 mu m. For specific laser processing, the two beams are rotatable when the beam-splitting diffractive element is rotated. The overall system is versatile for laser cutting and drilling.