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Also available in 48 h Express-Service
Hot mirrors are dichroic filter optics that can remove thermal energy from a light beam by reflecting IR-light and simultaneously transmitting the cold visible spectrum. Such optics base on the opposite optical function principle of cold mirrors. Since they reflect infrared light and filter it out of the beam path, they are called "hot mirrors", "heat-reflecting filters", or "heat reflection mirrors". All these designations are correct and customary.
Our SIR offers a decisive advantage over most standard hot mirrors and heat-absorbing filters. It provides a higher and more color-neutral optical transmission of visible light while reflecting the thermal radiation significantly more efficiently in the near-infrared up to 1100 nm. The all-dielectric optical coating design and the thermally resistant BOROFLOAT® substrate glass we use for our SIR hot mirror enables it to withstand a high temperature of up to 360 °C allowing the operation in high energy lighting systems.
SIR mirrors do not get as hot as filters based on absorption because they reflect the warm infrared radiation to the light source instead of absorbing it. This way, the thermal energy is blocked and reflected before it can enter the optical system.
In addition to the applications described above, there are also purely optical tasks for our SIR. For example, it is often used as detector trimmer optics in front of digital camera chips to prevent the image sensor from optical saturation caused by the near-infrared light. Many CCD camera sensors have a high sensitivity in this spectral range.
The non-metallic optical coating construction makes the SIR resistant to thermal load and humidity. We optimized the SIR's thin film for maximum possible optical transmission of visible light and maximum reflectivity in the NIR range. We conceptualized the SIR for a light incidence of 0°. However, in cases a slight shifting of the cut-off wavelength is acceptable, our standard SIR can also operate at an angle of 45°. In such cases, it still transmits most of the visible spectrum, and the reflected IR image keeps a good optical imaging quality. Hence, many customers successfully utilize our SIR mirrors for eye-tracking and IR laser beam-injection applications without modification. Using our standard hot mirrors can drastically reduce the cost compared to customized coatings, especially if only small quantities are needed. If you would like to use our SIR mirrors at an angle deviating from 0°, please send us an inquiry by e-mail or via our support form to obtain further information. We are happy to provide typical optical transmission curves of our hot mirrors when used at 45° or other angles.
Please note that we can adapt all of our optical hot mirror coatings regarding transmittance and reflection ranges by adding or modifying coating layers. The same applies to the optical cut-on and cut-off filter-wavelength and the angle of incidence of the optics. Please use our inquiry form for custom optics to conveniently request your individually designed optics.
To get a quotation for our standard SIR-hot mirrors with individual dimensions, please choose a thickness from the thickness table or click the button below.
|Custom thicknesses on request|
|The thicknesses marked with "✔" are also possible within 48–h Express Service.|
Note: If you are looking for optical mirrors with reverse functional characteristics, please visit our cold mirror website. If your application needs IR mirrors, please see our SEA-NIR, SEA-UV, and our ITO-coatings datasheets. ITO with higher film thicknesses is capable of reflecting infrared light.
All given details and specifications are mean reference values and are not guaranteed. Also, please consider our "Notes on technical specifications".
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