Cold Mirror Coating
February 2007
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New cold mirror coating technology withstands light levels above 200 W per square centimeter and extreme temperatures above 400°C, according to supplier Deposition Sciences, Inc. (DSI), of Santa Rosa, California, U.S. The product line is designed for high temperature and high-density performance for applications in projection display, medical, high power illumination, and other forms of digital projection.
DSI says the HeatBuster® Cold Mirrors have reflectivity values of up to 98 percent across the visible spectrum and extremely low reflectivity in the infrared, with transmission of equal to or less than 20 percent in the 800 nm to 2,500 nm waveband. The cold mirrors can be designed to operate over a wide range of angles and can be applied to both infrared transparent substrates (such as glass, fused silica and sapphire) and opaque materials (such as stainless steel and electroformed nickel). The cold mirror coatings efficiently reflect visible light without changing the color appearance of the source. The coatings can also be applied to the highly curved surfaces of parabolic and elliptical reflectors, meeting or surpassing adhesion standards.
The new white light coatings are said to be ideal for use in fold mirror and light tunnel applications where a focused light beam is needed to reduce the size of the optics and the overall unit. With high reflectivity at high angles of incidence, these all-dielectric cold mirrors can be used to replace silver coated mirrors in light tunnel applications. The supplier’s proprietary MicroDyn® sputtering technology is designed for a high-performance, highly durable cold mirror coating that is stable over temperature and humidity changes.

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