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在吸收基底上镀上一层折射率为N_1(在一定范围内)、厚度为d的透明薄膜,对于某一入射角φ,能使加膜基底的P与S偏振分量的复反射系数之比ρ=R_p/R_s是设膜基底时的ρ=R_p/R_s的倒数。本文叙述了确定φ、N和d关系的方法,以便在给定的基底和波长条件下,使ρ倒置(即ρ=1/ρ),并在6328A和10.6μm波长将此法分别应用于铝和银基底。还分析了倒置条件对入射角和膜厚误差的敏感性。ρ倒置膜层可应用于光束移动器(beam-displacer)或旋转三棱镜(axicon)中两金属反光镜中的一个,以便保持入射单色光的偏振态。
The absorption substrate is coated with a transparent film having a refractive index N_1 (within a certain range) and a thickness d. For a certain angle of incidence φ, the ratio of the complex reflection coefficient of the P and S polarization components of the film-forming substrate ρ = R_p / R_s is the inverse of ρ = R_p / R_s when the film substrate is set. This paper describes a method to determine the relationship between φ, N and d such that ρ is inverted (ie ρ = 1 / ρ) for a given substrate and wavelength and this method is applied separately to aluminum at 6328 A and 10.6 μm And silver substrate. The sensitivity of the inversion conditions to incident angle and film thickness error is also analyzed. The p-inverted film can be applied to one of two metal mirrors in a beam-displacer or axicon in order to maintain the polarization state of incident monochromatic light.