Method and article having predetermined net reflectance characteristics

摘要

An optically transmissive article having predetermined net reflectance characteristics and a method of forming such an article is disclosed. The article includes a holographic layer with fringe patterns generally paralleling a major surface of the article. The fringe patterns have been formed in such a way that the amplitude and phase of the light diffracted therefrom is in a predetermined relationship with the amplitude and phase of the reflected light. The relationship between the respective amplitudes and phases of the diffracted and reflected light determines the net reflectance characteristics of the article. In a preferred embodiment, the hologram is formed such that the diffracted light has the same amplitude but is 180 DEG out of phase with the reflected light so as to provide an antireflective coating for the article. In the method of making the article, the phase of one of the beams utilized in the formation of the hologram is adjusted until the desired net reflectance characteristics are detected.