Cold light filters picture, Cold mirror


Technical heat transmitting 45° cold mirrors

Special Properties

  • Very high reflectivity in the visible
  • Broadband infrared transmittance up to 2.500 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 coating system

Typical Applications

  • 45°-front surface mirror
  • Heat transmissive optical mirror in lighting system
  • Plane cool light reflector with optical function
  • Mirrors for sensor technology
  • Dichroic lighting optics
  • Cost-effective 45° laser mirrors
  • Mirrors for laser-diodes
  • VIS-blocking filter

The cold mirrors of our SHD series offer a very high reflection for visible light. Since they have a good transmission for infrared wavelengths up to 2500 nm at the same time, they are excellently suited for filtering cool light out of a beam path by deflection very efficiently and to let pass hot infrared light at the same time. The mirrors are designed for an angle of incidence of 45°.

Our SHD cold mirrors have good surface quality and are suitable for mumerous optics applications. In addition to the main application as a cold mirror, our SHD can also be used for coupling visible lasers into infrared light- or laser beams. Under certain conditions the use as an effective, low-cost laser mirror is also possible.

The dielectric coating construction of our cold mirrors provides a permanent resistance to heat and moisture. The glass substrate we use is a heat-resistant borosilicate glass.

Our company also manufactures cold mirrors according to customer's specification. Per batch, the layer system can be modified according to custom requirements in terms of the reflection range, the cut-on and cut-off points and the center wavelengths. Please fill out our coating inquiry form to get a quote for a customized cold mirror.


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

48h- Express Service terms & conditions

48-h Express Optics Service available


If you are interested in other lighting filters, please visit our dichroic SIR hot mirror and our KG-heat absorbing filter web sites.



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 ranges, customized cut-off and cut-on points or different angles of incidence 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 cold mirrors, please visit our SIR - hot mirrors 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"