| abstract |
The invention relates to a non-destructive evaluation method for the laser damage threshold of a large-diameter polished workpiece. A surface defect detection device is used to sample mechanical defects such as scratches and microcracks on the surface of the workpiece, and a computer is used to perform image preprocessing on the sampled pictures. Recognition and position marking, relying on the ultra-depth microscope to complete the accurate identification and extraction of mechanical defects, and realize the global evaluation of large-diameter workpieces, combined with the finite time domain difference method and the laser damage threshold evaluation formula, to obtain the laser damage on the surface of large-diameter polished workpieces Threshold, the principle is reliable, the implementation process is simple, and it can effectively reduce the consumption of workpieces in the process of traditional laser damage testing. The method of the invention is applicable to various large-diameter polished workpieces used in high-energy/high-power laser fusion devices. |