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Cold mirror is a specialized dielectric mirror that reflects the entire range of visible light wavelengths while very efficiently transmitting infrared wavelengths. Similar to hot mirror, cold mirror can be designed for an incidence angle ranging between zero and 45 degrees. And it is constructed with multi-layer dielectric coatings, in a similar manner to interference filters. You can use cold mirror as dichroic beam splitters with laser systems to reflect visible light wavelengths while transmitting infrared.