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Hot mirrors reflect a significant portion of unwanted infrared radiation (IR) while transmitting most of the visible light spectrum. This selective dichroic reflection and transmission capability is achieved through carefully tailored optical coatings deposited on optical substrates. By effectively reflecting the IR wavelengths and allowing visible light to pass through, hot mirrors prevent the excessive heating of target objects or sensitive components within optical systems. Hot mirrors work based 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 transmittance of visible light, while reflecting thermal radiation significantly more efficiently in the near-infrared up to a wavelength of 1100 nm. The all-dielectric filter design and the thermally resistant borosilicate glass our SIR hot mirror is coated on enable it to withstand high temperatures of up to 350 °C, allowing its operation in high-energy lighting systems.
SIR hot mirrors are ideal for heat management in optical systems. They 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 entering 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 a detector trimmer optic in front of digital camera chips to prevent image sensor saturation caused by near-infrared light. Many CCD camera sensors have high sensitivity in this spectral range.
The non-metallic construction makes the SIR resistant to heat and humidity. We optimized the SIR's thin film for the maximum possible visible light transparency and maximum reflectivity in the near infrared range. We conceptualized the SIR for a light incidence of 0°. However, when a slight shifting of the cut-off wavelength is acceptable, our SIR can also operate at an angle of 45°. It still transmits most of the visible spectrum at this incidence, and the reflected IR image maintains good optical imaging quality. Hence, many customers successfully utilize our SIR mirrors for eye-tracking or IR laser beam-injection applications without modification. Using our standard hot mirrors in such cases can drastically reduce costs, especially if only small quantities are needed because no expensive customization is required. If you want to operate our SIR mirrors at an angle deviating from 0°, please inquire by email or via our support form to obtain further information. We are happy to provide the typical curves of our hot mirrors when used at 45° or other angles.
We can customize our optical hot mirrors in terms of transmission and reflectivity by adding or modifying the coating layers. The same applies to the optics' optical cut-on and cut-off filter wavelengths. Please use our inquiry form to get a quotation for your individually designed custom optics conveniently.
Please choose a thickness from the table or click the button below to receive a quotation for our SIR-hot mirrors with individual dimensions.
|Custom thicknesses are available per inquiry.
|The thicknesses marked with "✔" are also possible within 48–hour express service.
Note: If you are looking for optical mirrors with the reverse functional characteristics of a hot mirror, please visit our cold mirror website. See our SEA-NIR, SEA-UV, and ITO-coatings datasheets if your application needs IR reflective mirrors. Please visit our cold mirror website for optical mirrors with reverse functional characteristics.
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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Last update: 08.02.2024