Optics and Photonics Society of Iran

- Multilayer dielectric reflectors are widely used in applications such as laser mirrors which require especially high reflectance at a design wavelength. High damage threshold mirrors are necessary in high power laser systems. The optics of these systems raises the problem of optimization of the optical coating and, at the same time, the study of the distribution of the electric field amplitude of the radiation in the coating lasers. In this paper we describe three methods for design partial reflector mirror at 10.6 micron. By analyzing admittance loci, electric field distribution of multilayer thin films, and improving the laser damage resistance of multilayer coating by decreasing the peak intensity within the critical layers, we show that the quarter wave optical thickness method is not proper for high damage threshold mirrors and in the following we investigate the optimal structure of layers.