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Dielectric mirrors are known for their very high optical reflectivity, which cannot be achieved at this level with metal-coated mirrors.
Dielectric mirror coatings are constructed by the alternated coating of thin layers of non-metallic materials with a different refractivity, one upon the other. Because their reflection is angle-dependent and they have a physically limited optical bandwidth such mirror systems usually are optimized for ultra-high mirror efficiency for a single wavelength or for 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. Those mirror optics therefore mostly do not provide such an extremely broadband reflectivity as metal-coated mirrors. Instead, they feature a much higher reflection for their 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, almost all incident light can be reflected.
Additionally, we took care that the layers of our SHR mirrors allow transmission of infrared wavelengths up to 2,5 µm. Hence, the SHR mirrors 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 additional function in combination with the low absorption of the dielectric thin-film coating system allows our SHR mirrors to be used as combining mirrors for light and 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, 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 substrate for the SHR 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 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 infrared light even more efficiently, if you need an increased optical flatness or surface quality or an ultra high reflection for a particular laser wavelength, all these options are generally possible. Also polarization optimization and definition of the damage threshold of the dielectric coatings is 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 very 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 will typically receive your quote within just a few minutes (provided we are in the same time-zone).
View reflection graph of the dielectric SHR mirrors
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