A hot mirror is a heat filter that is used to remove undesired infrared energy from a light source. It reflects infrared light while it is transparent in the VIS-spectrum which is the opposite way a cold mirror works. Our SIR heat filter shows a decisive advantage over ordinary hot mirrors coatings or absorbing filters. The transmission of visible light is higher and more neutral in color, while the thermal radiation (infrared light) up to 1100nm is reflected significantly more efficiently. Because of its 100% dielectric construction and the temperature-resistant quality BOROFLOAT® substrate, the SIR hot mirror can withstand high thermal energy. It can be used at operating temperatures of up to 400°C. Furthermore, a reflecting hot mirror does not warm up as heavily as a heat absorbing filter, because the warm infrared light is deflected and not absorbed. But there are also applications for our SIR filters that don't have much thermal energy to be removed. For example our SIR filter is often used in front of digital camera chips to prevent image sensor saturation caused by the near infrared light for which many digital camera sensors are very sensitive. Further, the non-metallic filter coating design makes the SIR hot mirror resistant to humidity and many other environmental conditions. Our SIR filter is designed for an angle of incidence of 0°. Nevertheless, if a shifting of the cut-off is acceptable, even our standard SIR mirror can be used at incidence angles of 45°. If you want to use the SIR mirror at other angles than 0°, please ask us for support, further information and typical transmission curves.
All of our heat reflecting mirror coatings can be modified in regards to transmittance and reflection wavelength ranges, as well as to the cut-on and cut-off filter wavelength and angles of incidences. Please use our custom optics RFQ form, to conveniently inquire your customized hot mirror or just contact us for further details.
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