一、基本原理由于薄膜和基底金属对入射光的依次反射,将入射光的振幅分解为若干部分,这些部分光波相遇时将发生干涉,使反射光减弱。若基底的折射率为η_2,膜层的折射率和几何厚度分别为η_1和d_1光波自折射率为η_0的介质入射到膜层上,则在η_0至η_1界面上的菲涅耳反射比为r_(01)=(η_1-η_0)/(η_1+η_0)(1)光波自η_1至η_0界面上的菲涅耳反射比为 First, the basic principles As the film and the base metal on the incident light in turn reflects the amplitude of the incident light is decomposed into several parts, these parts of the light waves will interfere when the encounter, the reflected light weakened. If the refractive index of the substrate is η_2, the refractive index and geometrical thickness of the film are η_1 and d_1, respectively, and the medium of refractive index η_0 is incident on the film, then the Fresnel reflection ratio at the interface η_0 to η_1 is r_ (01) = (η_1-η_0) / (η_1 + η_0) (1) The Fresnel reflection ratio of the lightwave from the interface of η_1 to η_0 is