Cold light filters, Cold mirror optics


Technical heat transmitting 45° cold mirrors

Special Properties

  • Very high optical reflectivity in the visible
  • Broadband infrared transmittance up to 2500 nm
  • Designed for an angle of incidence of 45°
  • High operating temperature range
  • Good optical characteristics
  • Very efficient heat / light separation
  • Temperature resistant borosilicate glass substrate
  • Dielectric multi-layer coating system

Typical Applications

  • 45°-cold mirrors
  • Infrared transmitting mirror optics in lighting systems
  • Plane cool light reflector with optical function
  • Mirrors for sensor technology
  • Cold light sources
  • Dichroic lighting optics
  • Cost-effective 45° laser front surface mirrors
  • Mirrors for laser-diodes
  • VIS-blocking filter
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The cold mirrors of our SHD series provide a very high reflection for visible light sources and lasers. Since they have a good transmission for infrared wavelengths up to 2500 nm, they are excellently suited to filter cool light out of a beam path. The SHD mirrors offer a very strong reflectivity for visible light, while they let pass hot infrared light (heat) at the same time.

The coating is designed for a reflection angle of incidence of 45° and lets pass the infrared at 0° in reference to the incoming light beam. The optic offers a very good surface quality and is suitable for various optical applications. In addition to the main use as a cold mirror, the SHD can also couple visible lasers into infrared light- or laser beams. In many cases, it is possible to use the cold mirrors as efficient, cost-effective laser optics.

The dielectric coating construction of the SHD mirrors ensures permanent resistance to heat and moisture. As mirror substrate for the SHD we use quality borosilicate glass, which enables it to be used even at high operating temperatures.

Our company also produces cold mirrors according to customer's specifications. On a batch basis, the layer systems can be modified in relation to the reflection range, angle of incidence, the cut-on and cut-off point, as well as to the center wavelength according to customer requirements. Please use our coating enquiry form to request a quotation for a customized cold mirror or simply contact us by e-mail.


If you would like to request a price of our SHD cold mirrors with individual dimensions, please click on the following button:

Get a Quotation

If you are also interested in other light filters, please visit the websites of our dichroic SIR heat reflecting hot mirror and our KG-heat absorbing filters.



SHD, reflectivity

View reflection spectrum of the SHD mirror



Glass Substrate


  • R > 99% for single wavelengths
  • Ravg > 97% at 400 - 690 nm at i = 45°
  • Tavg > 85% at 800 - 2500 nm
  • Other wavelength range, different angle of incidence, customized cut-off and cut-on point per inquiry


  • Depending on glass substrate material
    and glass thickness

Surface Quality

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

Standard Thicknesses

Adherence and Abrasion Resistance

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

Note: If you search for the opposite working principle of our SHD mirrors, please visit our SIR-hot mirror website for detailed information.


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