Deposition Sciences (Santa Rosa, CA) has released its Heat- Buster® cold mirror product line that features coating technology to withstand light levels above 200W per square centimeter and temperatures above 400°C. These cold mirrors feature reflectivity values of 98% across the visible spectrum and reflectivity in the infrared, with transmission of ≤20 percent in the 80-nm to 2500-nm waveband. The mirrors can be designed to operate over a variety of angles, and can be applied to infrared transparent substrates such as glass, fused silica, and sapphire, and opaque materials such as stainless steel and electroformed nickel.
The cold mirror coatings reflect visible light without changing the color appearance of the source. The coatings also can be applied to the curved surfaces of parabolic and elliptical reflectors. The “white light” coatings are suitable 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. The coating is stable over temperature and humidity changes, and is resistant to severe abrasion and adhesion.