Optical filters picture, Cold mirror
 
Home / Product Selection / Thin Film Coatings / SHR, Dielectric Mirrors

Dielectric Mirrors

High Reflection Front Surface Mirrors

SHR-Series

Special Properties

  • Very high broadband optical reflectivity
  • Increased operating temperature
  • Very low light absorption
  • Built for an incidence of i=45°
  • All dielectric layers
  • Metal free coating design
  • Good infrared transmittance
  • High temperature substrate material
  • Ultra low energy loss

Typical Applications

  • High reflection mirrors
  • Nearly loss free redirection of light sources & laser light
  • Front surface mirrors in optical systems
  • Optics for separation of visible- from IR-light
    (VIS/IR beam-splitters)
  • Beam separation or combining optics for lasers
    with different wavelengths
  • Laser beam injection mirror optics
  • Infrared filters
  • Broadband laser mirrors
  • Heat filter optics
  • Metal free mirrors in strong magnetic fields

The high reflection dielectric mirrors of our SHR-Series have been conceptualized for optical applications which require an extra high broadband optical reflectivity and an exceptional degree of efficiency for visible wavelengths. The optical mirrors are based on a pure dielectric multilayer thin film coating, which has been designed for an incident angle of 45°. The mirrors offer a broadband reflectivity and can be used to reflect images, light sources and also laser beam radiation.

Dielectric mirrors are constructed by alternated deposition of thin layers of non-metallic materials with a different refractivity, one upon the other. Because dielectric mirrors show an angle dependent reflection behaviour and a physically limited optical bandwidth of the reflectivity range, such kind of optics are always optimized for maximum reflectivity of single wavelength or a specific wavelength area. At the same time dielectric coatings are designed in a way to either work at one incident angle or at a range of incident angles. Dielectric mirrors therefore usually generally do not offer such an extremely broadband reflection like some metal coated mirrors do, but they feature a significantly higher optical reflection for their optimized wavelength range. This is of great importance for many applications. When we designed our standard SHR mirrors, we focused on the most often used visible wavelength spectrum. We optimized the dielectric mirror design for the most commonly demanded incident angle of 45° and for maximum reflection of the mirrors in this optical region. In addition to that we took care that the dielectric layers of our SHR mirrors allow to transmit the infrared spectrum up to 2,5 µm. Hence, they can also be used as high performance 45° infrared filters or as dichroic beamsplitters, because the mirrors can separate the visible spectrum from the infrared. This additional function in combination with the low absorption of the dielectric thin-film coating system enable the dielelectric mirrors even to be used as high reflection laser optics or as light source combiner mirrors for light and lasers of different wavelengths. That 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 and what laser beam power can be reflected with our high reflection dielectric mirrors, please contact our engineers with the details of your application, like laser wavelengths, laser beam diameter, laser beam power and all other relevant parameters. We will check on whether our standard SHR mirrors can be used as economically priced laser beam mirrors for your special applications without modification. Of course, also an optimized optical mirror design for polarized light, for which our standard SHR mirrors are not specified, is possible upon sufficient order quantities.

Another worth mentioning feature, is the good thermal resistance of the dielectric thin film coatings of the SHR mirrors. In combination with the temperature resistant borosilicate glass substrate material we use for the SHR mirrors, an increased operating temperature of up to approximately 360 °C is possible. 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 increased quantities, a customized design in terms of most technical requirements is possible for nearly all of our optical front surface mirrors. 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 ultra high reflection, all these options and products are possible. Within certain physical limitations, we can modify both, the reflectivity area and the angles of incidence of the dielectric mirrors. Also, a manufacturing with focus on polarization optimization of the mirror's reflectivity and damage threshold of the dielectric coatings is available. This is often required for laser beam redirecting mirrors and it is not a specified parameter for the standard SHR dielectric mirror products. Please contact our engineers for support or information or send us your detailed enquiry.


To request a quote for our dielectric high reflection SHR mirrors at custom sizes, please click on the button below:


Request for Quotation

48h-Express Optics Service. Terms & Conditions


48-h Express Optics Service available

 

 

Why don't we need a shopping cart?

Thats is quite easy. We manufacture each part according to the individual dimensioning requirements of our customers. We can deliver the optics tailored to your requirements to you on the basis of our standard coatings in a very short time. This is usually even faster than catalog optics with fixed optical dimensions can ship. Therefore a shopping cart on our website is obsolete. Simply use the above request button and enter the desired dimension. You will normally receive your individual offer in just a few minutes (provided we are in the same time-zone), for mirrors that are made to perfectly fit your application and not only to fit into a shopping cart.

 

Specifications


SHR dielectric mirrors, reflection curve

SHR mirrors reflectivity curve

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 reflectivity 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"