A novel high-power two-beam laser interference marking system

摘要

A novel high-power two-beam laser interference marking system is proposed. It is used to mark diffractive optical variable image on the surface of the glazed work piece directly. A high-power laser beam is split into two beams with equal energy. They are focused to form a spot composed of interference light field. The experimental results show that periodic micro-grating structure can be achieved with a single shot of laser ablation. Diffractive optical variable image, which is composed of micro-grating structures with different directions and different periods, has diffractive chromatic dispersion effects under the illumination of white light. The wavelength of the laser is 527nm. The energy of the single-pulse laser is 1.0mJ@20ns. The materials can be the stainless steel, the chromium film and other metals. The experimental results have been given.