Axial multi-focus stealth cutting method based on the fractional Fourier transform for quartz glass

Abstract

Aiming at the problems of quality defects, low efficiency, and insufficient flexibility in the traditional glass cutting process, this paper proposes a holographic ultrafast laser axial multi-focus stealth cutting method. By changing the fractional Fourier transform order, combined with the 3D-GSW iterative optimization algorithm, the spatial position and energy of the axial multi-focus can be flexibly adjusted. Focusing the axial multi-focus inside the quartz glass not only improves cutting efficiency but also eliminates the defects such as chipping and microcracks. This processing method has good prospects for applications in optical material processing and optical manipulation. A holographic ultrafast laser parallel processing system was built, and the diffraction efficiency and light intensity uniformity of the axial multi-focus were simulated and analyzed. Using this stealth cutting method, a single scanning cutting of quartz glass (200 μm) was successfully achieved with intact glass edges and no microcracks. The minimum roughness of the cutting section is 2.21 μm.