Optimizing attaching area in ultra-thin active mirror system

摘要

Ultra-thin mirror often is used in active optics and adaptive optics. To maintain its surface, activators are used. Many factors are important including how much area should the attaching area be. A simplified deformation model was established considering mirrors' practical using. It would deform linearly outside attaching area and keep no change within attaching area. In this model, aspherical error is a key factor. Using zernike polynomials, the relationship between attaching area and surface error introduce by activator is established. At last, finite element method is used to testify theoretical analysis. It proves to be reasonable that decrease the ratio of attaching area and activator's controlling area. To decrease stiff concentration, the ratio should be about 1/10.