Cold light filters picture, Cold mirror
 
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Cold Mirrors

Heat transparent high reflection mirrors, SHD-Series

Special Properties

  • Very strong reflectivity
  • Excellent reflection characteristics
  • Broadband infrared transmission (up to 2.500nm)
  • High operating temperature
  • Very effective separation of IR-energy
  • Temperature resistant borosilicate glass substrate
  • Good mechanical stability

Typical Applications

  • Highly reflection mirrors for the VIS spectrum
  • Heat filters in lighting systems
  • Mirrors for cold light sources
  • Dielectric mirrors for sensor technology
  • Dichroic lighting mirrors
  • Scanners and bar code reader optics
  • Infrared filters

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

Cold mirrors works the opposite way dichroic hot mirror filters works. Hot mirrors are designed for maximum transmission 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 offer a very high reflection.

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

 

The features of our SHD cold mirrors

The SHD mirrors are 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 mirror 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 cold mirror 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 mirror sizes. Our strength is to be just as quick or even quicker with individually sized optics 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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Specifications


SHD Cold Mirrors, reflectivity curve

SHD reflectivity spectrum

Construction

Glass Substrate

Reflectivity

  • 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

Flatness

  • 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"