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长期以来,在光学中采用了消反射膜,这种消反射层能够降低介质表面的(特别是玻璃表面的)反射能力。这样,在光学系统中就可避免产生杂散光,特别是在多镜头系统中还可改进图象的质量与亮度。众所周知的消反射膜是由光学厚度(nd)为消反射范围中心波长λ_0的 I/4的低折射率单层介质(特别是 MgF_2)构成。这种消反射膜层所具有的优点为:残余反射的光谱是平直的,因此,反射的光不具有强烈的颜色。但其缺点为:对低折射率的玻璃来说,残余反射的
Anti-reflection coatings have been used in optics for a long time. Such anti-reflection coatings can reduce the reflectivity of the media surface, especially the glass surface. In this way, stray light can be avoided in the optical system, and the quality and brightness of the image can be improved especially in a multi-lens system. The well known anti-reflection film is composed of a low refractive index monolayer medium (especially MgF 2) having an optical thickness (nd) of I / 4 of the center wavelength λ 0 of the antireflection range. This antireflective coating has the advantage that the spectrum of the residual reflection is flat and therefore the reflected light does not have a strong color. But the disadvantage is: for low refractive index glass, the residual reflection