Cold light filters picture, Cold mirror
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Cold Mirrors

Heat transparent high reflection mirror, SHD-Series

Special Properties

  • Very strong reflectivity
  • Excellent reflection characteristics
  • Broadband infrared transmittance (up to 2.500nm)
  • High operating temperature
  • Constructed to reflect the visible spectrum
    and to transmit the infrared
  • Very effective separation of IR-energy
  • Temperature resistant borosilicate glass substrate
  • Good mechanical stability

Typical Applications

  • High reflection mirrors for the VIS spectrum
  • Heat filters in lighting systems
  • Mirror for cold light sources
  • Dielectric mirrors for sensor technology
  • Low-cost dielectric 45° laser optics
  • Dichroic lighting optics
  • Scanners and bar code reader optics
  • IR-filters
  • Laser beam separation

Cold mirrors, what they are and what they are used for

Our cold mirrors work the opposite way dichroic hot mirror filters do. Hot mirrors are designed for maximum transmittance in the visible and maximum reflectivity in the near infrared, whereas cold mirrors are optimized for maximum reflectivity of the visible wavelengths and best possible transmittance in the infrared range (heat). They work as heat filters and at the same time they reflect cold light very efficiently.

Our SHD series are flat, dielectric front surface coated optics, used in applications that require a very strong reflectivity in the wavelength range of approx. 400-700nm and an excellent quality reflecting optic for an incidence angle of 45°. At the same time, the dichroic coating system very effectively filters out most of the infrared energy from a illumination source up to approximately 2500nm, resulting in a cool reflected light beam. This very broadband transmissivity in the infrared wavelength range is a great advantage over a hot mirror in regards to efficiency, when it is critical to remove or filter out the heat energy from an optical system, because the reflectivity wavelength range of hot mirrors for physical reasons is limited to a more narrow bandwidth in the infrared.


The features of our SHD cold mirror

The SHD is coated on temperature resistant glass substrates. Hence it is a good choice for very efficient heat-light separation systems, because most of the IR-energy is removed by IR-transmissivity. The multilayer thin film coating design features an outstanding temperature resistance, and shows a distinguished resistance against moisture and abrasion. If required, the coating of our SHD cold mirrors can be modified for different transmission-, reflectivity- and filter ranges, as well as in regards to the cut-on and cut-off points. Other glass substrates are optionally available. Please use our customized optics inquiry sheet, to conveniently inquire for your individually made optical design. For further information, please use our information questionnaire.


How to buy the mirrors

We are not limited to a small standard delivery program with pre-defined dimensions. Our strength is to be just as quick or even quicker with individually sized optical products as you might be used to, when you buy stock items. In other words, you can order the cold mirrors at exactly the size you need them, without the disadvantage of a long lead time.

To ask for a quotation for cold mirrors of the SHD series with individual dimensions, please click the button below:

Request for Quotation

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SHD Cold Mirrors, reflectivity curve

View SHD reflectivity spectrum


Glass Substrate


  • R > 99% for single wavelengths
  • Ravg > 97% at 400-690nm at i=45°
  • Other wavelength ranges or customer specific
    cut-off and cut-on points or different angle of incidence on request


  • Depending on glass substrate material
    and glass thickness
  • Other on request

Surface Quality

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

Standard thicknesses

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 specifications"