Thin film for absorbing laser energy

• Main Authors: CHEN SHUHAN, DENG DINGNAN, ZHANG HAINING
• Format: Patent
• Language: Chinese; English
• Published: 04.04.2023
• Subjects: CHEMICAL SURFACE TREATMENT; CHEMISTRY; CLADDING OR PLATING BY SOLDERING OR WELDING; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; METALLURGY; PERFORMING OPERATIONS; SOLDERING OR UNSOLDERING; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TRANSPORTING; WELDING; WORKING BY LASER BEAM

The invention provides a thin film for absorbing laser energy, the thin film comprises high refractive index layers, low refractive index layers and metal layers, and the number of the high refractive index layers is equal to that of the low refractive index layers; the high-refractive-index layers and the low-refractive-index layers are stacked at intervals to form dielectric layers; the metal layer is arranged on the side, with the low refractive index, of the dielectric layer; the refractive index of the high refractive index layer is 2.3 to 2.7, and the refractive index of the low refractive index layer is 1.2 to 1.8. When the thin film is used for laser welding, the laser reflection effect of 0% can be achieved theoretically, the laser reflection effect can be controlled within 8% even if errors exist in the laser welding process, the laser welding quality can be remarkably improved, smaller laser energy can penetrate through a transparent material, and the laser welding quality is improved. And high-qua