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SHR

Dielectric front surface mirrors with high reflection

Special Properties

  • Very high broadband optical reflectivity
  • Increased operating temperature
  • Very low light absorption
  • Built for 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 in optical systems
  • Nearly loss free redirection of light sources & laser light
  • Dividing mirrors (VIS/NIR+IR beam-splitters)
  • Beam separation- or combining optics for lasers
    with different wavelengths
  • Laser beam injection mirror optics
  • Infrared filters with high visible reflection
  • Broad-band laser mirrors
  • IR- and NIR 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 reflection 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 angle of incidence of i = 45°. The mirrors offer a high, 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 optical performance and a physically limited optical bandwidth, such kind of optics are usually optimized for maximum efficiency at a single wavelength or at a specific wavelength area. At the same time, dielectric coatings are often are designed in a way to either work at one angle or at a range of angles of incidence. Dielectric mirrors therefore often 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. Our SHR mirrors however are conceptualized to be broadband enough to offer the high optical reflection, that is characteristic for dielectric coatings, over the whole visible spectrum. This has to be taken into account for many optical applications.

In addition to that, we took care that the dielectric layers of our SHR mirrors allow to transmit the NIR and the infrared spectrum up to 2,5 µm. Hence, the mirrors can also be used as effective infrared filters or as dichroic optical beamsplitters. The mirrors can separate the visible spectrum from the infrared wavelength range very efficiently. 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's 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 line 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. We will check on whether our standard SHR-mirrors can be used as economically priced laser beam mirrors for your special optical systems, without modification. Of course, also an optimized 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 of the mirrors, an increased 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 increased quantities, a customized optical design in terms of most technical requirements is optionally available 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 an ultra high reflection, all these options and products are possible. Within certain physical limitations, we can modify both, 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 dielectric 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 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 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. This is often even faster, than catalog optics with fixed optical dimensions ship. Therefore a shopping cart on our website is obsolete. 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 are made to perfectly fit your application, instead of just fitting 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"