| 摘要 |
A heat-treatable dichroic mirror, comprising a transparent substrate having a glass transition temperature in the range of 650-800 ~C, and a plurality of sputtered films carried on said substrate and forming at least two pairs of contiguous films in which the films of each pair have disparate refractive indices differing by at least about 0.2 so as to provide between them a reflective interface. The films include an oxide of a metal such as titanium , a second film comprising an oxidizable metal or semi-metal such as silicon, and a protective overcoat of a thickness and composition sufficient to substantially prevent permeation of oxygen therethrough when heat treated at said glass transition temperature. The mirror, after said heat treatment, exhibits a transmittance of at least 24 % in the wavelength range of 550-650 nm, a reflectance of at least 45 %, and a haze of not greater than about 1 % .
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