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  • substrate blank Materials (usually ceramics or other semiconductors) that are molded into approximate forms to use as supports for large mirrors or as blocks for microcircuits.
  • grating substrate The substrate upon which a diffraction grating will be ruled. It must be dimensionally stable, and the surface must be polished to an accurate flat or spherical form as required by the grating. The substrate for a replica must have the identical but...
  • mirror blank The material on which the reflecting coating for a given mirror design is applied. It may be glass, quartz, Cer-Vit or metal. The thickness must be adequate to prevent distortion of the surface under gravity, and a low thermal expansion combined...
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