Hologram optimized in holographic laser processing system

Abstract

We proposed an optimization method of a hologram in holographic laser processing. The laser beam was diffracted by a designed computer-generated hologram (CGH) displayed on a liquid-crystal-on-silicon (SLM), and then formed spatially shaped three-dimensional optical pattern which detected by a CCD image sensor at different focal position for continuously optimizing with the weighted iterative Fourier transform (WIFT) algorithm. The uniformity of the pattern was increased from 11% to 95%, which was also well proved by the corresponding 3D processing results. This method provides the holographic laser processing system with high-stability, that is, the ability to dynamically compensate for system imperfections, and has the ability to be suitable for a wide range of high-precision, high-throughput applications in the field of 3D manufacturing.