Optical thin film plays very important role in increasing and reducing the refraction , absorbing , transmission , in composing and reducing chromatic color , in modulating the polarizing state and changing phase of light . in short , almost all the optical system uses the character of optical thin film 光學(xué)薄膜在增加或減少反射、吸收和透射;在彩色的合成與還原;在調(diào)整光束的偏振態(tài)和改變光束的相位狀態(tài)等方面發(fā)揮著重要的作用,簡而言之,在光學(xué)系統(tǒng)中的幾乎所有的特性方面都發(fā)揮著重要的作用。