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Cold Mirrors

Dielectric heat-transmitting 45° front surface mirrors
SHD Series

Special Properties

  • Very high visible reflectance
  • Efficient separation of heat and light
  • Excellent infrared transmission up to 2500 nm
  • Temperature resistant BOROFLOAT® substrate
  • Designed for a 45° angle of incidence
  • Excellent optical properties
  • Multilayer mirror coating

Typical Applications

  • Heat and light separation in lighting systems
  • High reflectance mirrors
  • IR rejection filters in optical systems
  • Sensor technology
  • Dichroic beamsplitter applications
  • Medical lighting devices
  • Mirror for cold light sources
  • Laser mirrors
  • Filters for fiber optic systems
  • Low cost 45° laser mirrors
  • Laser diode applications
  • Laser beam combiners
  • Infrared filters (NIR-IR)
  • VIS blocking filters

Similar Mirror Types


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Cold mirrors play a critical role in a wide range of applications that require precise control of heat and light. In lighting applications, cold mirrors protect sensitive objects from potential heat damage by effectively allowing infrared light to escape from the target area. We have designed our SHD dichroic cold mirrors to reflect at an angle of 45° and transmit infrared radiation at 0° relative to the incident light beam. They provide excellent optical reflectivity for visible light while transmitting more than 90% (average) of the infrared light up to 2500 nm. The SHD is ideal for extracting cold visible light from a beam path while removing most of the thermal energy and maintaining a high imaging quality. In addition to its primary use as a cold mirror, the SHD can also be used to combine visible light with infrared light or laser beams. It functions as a highly efficient and cost-effective laser mirror in the visible. Its dielectric mirror construction ensures permanent resistance to thermal stress and moisture. High-quality BOROFLOAT® substrates allow the SHD cold mirrors to operate at elevated temperatures.

We also manufacture customized cold mirror optics and can modify the layer design in terms of reflection wavelength, angle of incidence, cut-on, cut-off wavelengths, damage threshold, and spectral operating range of the reflective coatings on a batch basis. If you need assistance with your individual cold mirror design, please use our inquiry form to let us know your detailed requirements.

Please click the button below or select a thickness from the table to receive a quotation for our standard SHD cold mirrors with custom dimensions.

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If you are interested in other mirror coatings or filters that block or transmit thermal energy or infrared light, please visit the web pages of our SIR mirrors and KG heat-absorbing filters.



Reflectivity of the SHD cold mirrors

SHD reflectivity curve
Enlarge the curve to show details

Stock Thicknesses

Click on the thicknesses below to start an inquiry:

Thickness (mm)


48h-Express Delivery
1.10 ±0.10
1.75 ±0.20
3.30 ±0.20
Custom thicknesses are available on request.

Optical Reflectivity and Transmission

  • R > 99% for single wavelengths
  • Ravg > 97% at 400 – 690 nm at 45°
  • Tavg > 90% at 800 – 2500 nm
  • Other wavelength ranges and different incidence angles per inquiry




  • Depending on the 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 are searching for optics with the inverse function principle of the SHD cold mirrors, please refer to our SIR heat-reflecting filters for detailed information.


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

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Last update: June 24, 2024