Cold mirrors are heat-transmitting mirrors that are designed to work as long-pass filters by reflecting visible wavelengths while transmitting NIR wavelengths.
Visible light is reflected, and the hot part is transmitted when using the cold mirror.
Fused Silica, H-K9L (BK7), Float Glass
Front Surface Flatness
60-40 Parallelism: Within 3 arcmin
Hot Mirror Coatings
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No. 1567 Liu Ying Lu, Kuan Cheng District, Chang Chun, P.R. China