Cold light filters, Cold mirror optics


Technical heat transmitting 45° cold mirrors

Special Properties

  • Very high optical reflectivity for visible wavelengths
  • 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 optics in lighting systems
  • Plane cool light filters 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 optics
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The cold mirrors of our SHD series provide a very high reflection for visible light sources and laser systems. Since these optics 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 mirror coating is designed for a reflection angle of i = 45° and transmits infrared radiation at 0° relative to the incident light beam. SHD cold mirrors offer a very good surface quality and are suitable for numerous optical applications. In addition to the main application as cold mirror optics and due to its dichroic design the SHD can also couple visible lasers into infrared light- or laser beams. Besides that, in many cases it is possible to utilize our dielectric cold mirrors as efficient and cost-effective laser mirrors for visible wavelengths and unpolarized laser systems.

The coating construction of the optics ensures permanent resistance to heat and moisture. As substrate for the SHD series 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 of the optics can be modified in relation to the reflection range, angle of incidence, the cut-on and cut-off point, as well as to the operating wavelength range according to customer's requirements. In such cases please use our coating enquiry form to request a quotation for a customized cold mirror optics or simply send us an e-mail.


To request a price of our SHD cold mirrors with individual dimensions please click on the following button:

Get a Quotation

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



SHD, reflectivity

View reflection and filter spectrum of the SHD mirror





  • 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 substrate material and 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 optics with 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"