All dielectric mirror coatings have high reflectance over a spectral band defined by the central wavelength. Mirrors centered in the mid-visible to the near IR will typically have high reflectance at the center wavelength ± 10%. Typical performance bands available are shown in the following plot. The bands can be adjusted to meet specific requirements. All of these coatings are moisture stable when deposited on appropriate base materials.

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Dense Moisture Stable Titania and Silica Ion Assisted Deposited Films
Deposited Using a Compact Cold Cathode Ion Source