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SHR

Dielectric, high reflection front surface mirrors

Special Properties

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

Typical Applications

  • High-reflection mirrors in optical systems
  • Nearly loss free redirection of light sources & laser light
  • 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 reflection in the visible
  • Broadband laser mirrors
  • IR- and NIR-filter optics
  • Metal-free mirrors for use in strong magnetic fields

The high-reflection dielectric mirrors of our SHR-Series offer an extra high, broadband optical reflection. They have an exceptional degree of reflection efficiency 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 provide a broadband reflectivity and can be used to reflect images, light sources and also for laser beam radiation.

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. Dielectric mirrors therefore usually do not have such an extremely broadband reflection 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 visible spectrum. This is of great importance for many optical applications.

In addition to that, we took care that the layers of our dielectric SHR mirrors allow transmission of the infrared spectrum up to 2,5 µm. Hence, the mirrors can also be used as effective infrared filters and as dichroic optical beam splitters, because they can separate the visible spectrum and the infrared wavelength range 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 optics or as light source combiner mirrors for light and lasers of visible and infrared wavelengths. This is possible even at increased laser beam powers, because the very small amount of optical absorption of the dielectric mirror coating in the nominal spectrum is negligible. For information about what lasers, what laser beam power and what laser lines can be reflected with our dielectric mirrors, please contact our engineers with the details of your application like laser wavelength, laser beam diameter, laser beam power and all other relevant parameters. Of course, also an optimized design for polarized light, for which our standard SHR mirrors are unspecified, is possible upon sufficient order 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. Of course, the heating up process must be uniform and possible temperature gradients over the mirror surface must not exceed the allowed physical limits.

At larger quantities, a customized optical design in terms of most technical requirements is optional for nearly all of our front surface 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, all these options and products are possible. Within certain physical limitations we can also modify the operating wavelength range of the dielectric layers. Also, a manufacturing with focus on polarization optimization of the mirror's reflectivity or the damage threshold of the dielectric coatings is available. This is often a requirement for laser beam redirecting mirrors and it is not a specified parameter for the standard SHR mirror series. Please contact our engineers for support or information or send us your detailed enquiry if these parameters are of interest.

 

To request a quote for our dielectric, high reflection SHR front surface mirrors with customized dimensions, please click on the button below:

 

Request for Quotation

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48-h Express Optics Service available

 

 

Why don't we have a shopping cart?

Thats is quite easy. We manufacture each part according to the individual dimensioning requirements of our customers. We can manufacture the optics tailored to your dimension requirements to you on the basis of our standard coatings in a very short lead time. Often even faster, than catalog optics with fixed optical 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 application, not only into a 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 technical specifications"