Optical filters picture, Hot Mirrors

Hot Mirrors

Mirror with high infrared reflection
and high transmission of visible light

SIR-Hot Mirror Series

Special Properties

  • Very good infrared reflection up to 1100nm
  • High and neutral spectral transmissivity in the visible
  • High operating temperature (up to 400°C)
  • 100% dielectric multilayer construction
  • Transmits cold light

Typical Applications

  • Color neutral and efficient separation of
    thermal energy and light
  • IR- or CCD-Filter for digital camera chips
  • Sensor- and measurement applications
  • Detector trimmer
  • Infrared mirror
  • Eye tracking mirrors
  • Infrared photography filter
  • IR-mirror in lighting systems
  • Lighting filter
  • Imaging projectors
  • Lens system protection

Hot Mirrors are heat filters that are used, to filter out the undesired infrared energy from a light source. They reflect infrared light while they are transparent for the VIS-spectrum. Our SIR heat reflecting mirror shows a decisive Hot Mirroradvantage over ordinary hot mirror coatings or absorbing filters. The transmission of visible light is higher and more neutral in color, while the thermal radiation up to 1100nm is reflected significantly more efficiently. Because of its 100% dielectric construction and the temperature-resistant quality BOROFLOAT® substrate, the SIR filter can withstand a high thermal energy. Our standard SIR hot mirror can stand operating temperatures of up to 400°C. Furthermore, an IR-reflecting mirror does not warm up as heavily as a heat absorbing filters, because the warm IR-light is deflected and not absorbed. Further, the dielectric filter coating design makes the SIR resistant to humidity and many other environmental conditions. The hot mirror is designed for an angle of incidence of 0°. Nevertheless, if a shifting of the cut-off is acceptable, our standard SIR hot mirror can also 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 and typical transmission curves.

All of our hot mirror coatings can be modified in regards to transmission and reflection wavelength ranges, as well as to the cut-on and cut-off 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.

For a quotation for our SIR mirrors with individual dimensions, please click the button below:

Request for Quotation


SIR Hot Mirror transmission curve

Show spectral transmission curve of our SIR


Product Code

  • SIR


Coating Construction

  • 100% dielectric
  • Designed for an angle of incidence of 0°
  • Other cut-ons / cut-offs available if required

Operating Temperature

  • up to 400°C


Surface Quality

  • typ. 80-50 scratch & dig (MIL-0-13830A)
  • Other on request

Standard thicknesses

  • 1,1mm / 1,75mm / 3,3mm

Other Specifications

  • Adherence according to MIL-C-675 C (tape test)
  • Abrasion resistant according to MIL-M-13508 C

All given details and specifications are mean reference values and are not guaranteed. In addition, please consider our "Notes on technical specifications"