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SHR

Dielectric, high reflection front surface mirrors

Special Properties

  • Excellent broadband optical reflectivity
  • Made for an angle of incidence of i = 45°
  • Remarkable infrared transmittance
  • Large operating temperature range
  • Very low light absorption
  • Temperature resistant glass substrates
  • 100% dielectric metal free optical layers
  • Ultra-low loss of light energy

Typical Applications

  • High-reflection mirrors in optical systems
  • Nearly loss free redirection of light & laser beams
  • Dichroic divider mirrors (VIS/NIR+IR beam-splitters)
  • Beam separation or combiner optics for lasers
    with different wavelengths
  • Laser beam injector mirror optics
  • Infrared filters with high reflectivity in the visible
  • Broadband laser mirrors
  • IR- and NIR-filter optics
  • Metal-free mirrors for use in strong magnetic fields
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The high-reflection dielectric mirrors of our SHR-Series offer an extra high broadband optical reflection. They have an exceptional degree of reflectivity for visible wavelengths. The optical mirrors are based on a pure dielectric multilayer thin film coating which has been designed for the most common angle of incidence of i = 45°. The mirrors can be used to reflect images, light sources, and also laser beams.

Dielectric mirror coatings are constructed by alternated coating of thin layers of non-metallic materials with a different refractivity one upon the other. Because their optical reflection is angle-dependent and they have a physically limited optical bandwidth, dielectric mirrors usually are optimized for maximum efficiency at a single wavelength or for a specific but limited wavelength area. At the same time dielectric coatings are either optimized for one single angle or for a range of angles of incidence. They therefore usually do not have such an extremely broadband reflectivity as some metal coated mirrors. But instead they feature a significantly higher optical reflection for their optimized wavelength range. Our SHR mirrors however is conceptualized in such way to offer the very high optical reflection that is characteristic for dielectric mirrors over the whole VIS-spectrum. This broadband mirror design is of great advantage for many optical applications.

In addition to that we took care that the layers of our dielectric SHR mirrors allow transmission of infrared wavelengths up to 2,5 µm. Hence, the mirrors can also be used as effective IR-filters or as dichroic optical beam splitters because they can separate visible from infrared wavelengths very efficiently. This additional function in combination with the low absorption of the dielectric thin-film coating system enable the mirrors even to be used as high-reflection laser mirrors and as light source combiner mirrors for light and lasers of VIS and IR-wavelengths. That is possible even at increased laser beam powers because the very small amount of optical absorption of the dielectric mirror coating within the operating bandwidth is negligible. For information about what laser, what laser beam power, and what laser lines can be reflected with our dielectric mirrors please contact our engineers and let them know the details of your application like laser wavelength, laser beam diameter, laser beam power, etc. Of course also an optimized design for applications with polarized light for which our standard SHR-mirrors are unspecified is possible upon sufficient production quantities.

Another worth mentioning feature is the good thermal resistance of the thin-film-coatings of our SHR mirrors. In combination with the temperature resistant borosilicate glass substrate an operating temperature of up to approximately 360 °C is feasible. The heating up process must be uniform though and possible temperature gradients over the mirror surfaces must not exceed the allowed physical limits.

At larger quantities a customized optical design in terms of most optical requirements is optional for nearly all of our mirror coatings. Whether you need laser optimized dielectric mirrors, if you need a design that filters out infrared light more efficiently, you need an increased optical flatness, or an ultra high reflection for a special laser wavelength. All these options and products are possible. A manufacturing with focus on polarization optimization or on the damage threshold of the dielectric coatings is available too. This is often a requirement for laser beam redirecting mirrors and it is not a specified parameter for the standard SHR mirror series. Please ask our engineers for support or additional information or send us your enquiry if these options are of interest.

 

To request a quotation for dielectric high reflection SHR mirrors with customized dimensions please click on the button below:

 

Request for Quotation

 

 

Why we don't have a shopping cart:

That is quite easy. We manufacture each part according to the individual dimensioning requirements of the customer. We fabricate optics to your dimension requirements on the basis of our standard optical coatings in a very short time. Often even faster than catalog optics with fixed dimensions can be shipped. Therefore a shopping cart on our website is not required. Simply click on the above request button and enter the desired dimensions. You will normally receive your individual quotation within just a few minutes (provided we are in the same time-zone). So the mirrors perfectly fit into your applications, not only into the shopping cart.

 

Specifications

SHR dielectric mirrors, reflection curve

View SHR mirrors, reflection graph (click to enlarge)

Naming

  • SHR dielectric, high-reflection broadband
    front surface mirror

Mirror Coating

  • All dielectric, non-metal, low absorption, broadband, high quality thin-film mirror coatings

Mirror Substrate Material

Optical reflection for unpolarized light at 45°

  • Ravg > 99% at wavelength 425-680 nm at 45°
  • Ravg > 97% at wavelength 400-690 nm at 45°
  • Other wavelength ranges and incident angles per request
  • Special mirror designs for polarized laser redirecting use are feasible on demand

Flatness

Surface Quality

  • typ. better than 80-50 scratch & dig (MIL-0-13830A)
  • Better quality on request if required

Stock Thicknesses

Other Properties

  • Adherence to MIL-C-675 C (tape test)
  • Abrasion resistant to MIL-M-13508 C
  • Damage threshold not specified for the standard design. More information on request.
All given details and specifications are mean reference values and are not guaranteed. In addition please consider our "Notes on specifications"