A design with high spectral efficiency and high laser induced damage threshold for 1064nm partially reflective coatings

The 1064nm partially reflective coatings has been widely used in high-power laser optical components. The current research status on 1064nm partially reflective coatings is that it is difficult to balance the electric field and spectral tolerance. In order to satisfy both high spectral efficiency and high laser induced damage threshold, we use HfO2 and SiO2 to design and fabricate three kinds of coatings with different electric field distributions. This paper measured the actual spectra of the three coatings and obtained high spectral efficiency. The damage threshold of the coatings is measured by the damage threshold test platform built by the laboratory. The final research results show that when the matching layer is on the side of the substrate, the electric field is lower and the damage threshold of the coatings is higher.