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Dielectric mirrors are known for their ultra-high optical reflectivity, which metal-coated mirrors cannot achieve at this level. The construction of such coatings bases on the alternated deposition of thin layers of non-metallic materials with a different refractivity, one upon the other. Because the reflection of dielectric mirror coatings is angle-dependent and since they have a physically limited optical bandwidth, such coating systems usually are optimized for ultra-high mirror efficiency for a single wavelength or a specific but limited wavelength area. At the same time, dielectric mirrors are usually either optimized for only one or a small range of incidence angles. Hence, those mirror optics mostly do not provide an extremely broadband reflectivity as metal-coated mirrors do. Instead, they feature a much higher efficiency within the optimized wavelength range. The optical mirrors of our SHR series have a dielectric multilayer thin film coating that is broadband enough to reflect the entire visible spectrum at the most common angle of incidence of 45°. They can be used to reflect images, light sources, and also laser beams very efficiently. This broadband mirror design is of significant advantage for the majority of optical applications. Because the SHR coatings nearly show no absorption, they reflect almost all incident light.
Additionally, we took care that the layers of our SHR mirrors allow transmission of infrared wavelengths up to 2,5 µm. Hence, the optics can also be used as effective IR-filters or as dichroic beam splitters because they can separate the VIS from the IR range very efficiently. This feature, in combination with the low absorption of the dielectric thin-film coating system, allows using our SHR mirrors as combining mirrors for light or multiple lasers with different wavelengths in the VIS and IR-spectrum. That is possible even at increased laser beam power because the minimal amount of optical absorption of the mirror coating within the operating bandwidth is negligible. For information about what lasers, what laser beam power, and what laser lines can be reflected with our dielectric mirrors, please ask our engineers and let them know the details of your application like wavelength, laser beam diameter, laser power, damage threshold, and similar specifications. Of course, also an optimized design for polarized light for which our standard SHR-mirrors are unspecified is possible upon sufficient production quantities.
Another worth mentioning feature of our SHR mirrors is the excellent thermal strength of their thin-film coatings. By using a thermally resistant high-quality borosilicate glass substrates for the SHR, an operating temperature as high as approximately 360 °C is possible. The heating up process must be uniform, and possible temperature gradients over the mirror surfaces must not exceed allowed physical limits.
At larger quantities, a customized design also for our SHR-mirror coatings is possible. If you need laser-optimized dielectric mirrors, a model that filters out the infrared even more efficiently, if you need an increased optical flatness or ultra-high efficiency for a particular laser wavelength, all these options are generally possible. Also, polarization optimization and definition of the damage threshold of the dielectric coatings are feasible too at batch quantities. These properties are often critical for laser redirecting mirrors and are not a specified parameter for the standard SHR mirror series. Please ask our engineers for support or additional information or send us your detailed coating inquiry if any of these options are of interest to you.
To get a quote for our dielectric SHR mirrors with customized dimensions, please click on the button below:
We manufacture each mirror according to individual size requirements to perfectly fit into the customer's application. We can fabricate optics to size from our standard optical coatings in a short time. Often we are even faster than re-sellers can ship their catalog mirror optics with fixed dimensions, which makes a shopping cart superfluous. Just click on the above RFQ-button and enter the desired dimensions. You typically receive your quote within just a few minutes (provided we are in the same time-zone).
View reflectivity of the dielectric SHR mirrors
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