Laser-damage-resistant optical reflecting film system and design method

The invention discloses an optical reflection film system resistant to laser damage and a design method. According to the invention, an electric field regulation and control layer is newly added on the outer side of a reflecting film system with the initial quarter wavelength thickness, and the internal electric field of the film is optimized by constructing the relationship between the physical thickness of a film layer in the newly added electric field regulation and control layer and the refractive index of the film layer in the newly added electric field regulation and control layer. And aiming at the reflecting film system after the electric field regulation and control layer is added, establishing a model of the film system with the knot defect, and obtaining a peak electric field when the knot defect exists. Then, in a model with defects, the refractive index of a film layer in a new electric field regulation and control layer is obtained through a particle swarm optimization algorithm when a peak elec