The dielectric high reflection mirrors of our SHR-Series have been conceptualized for optical applications which require extra high broadband reflection mirrors and an exceptional degree of efficiency for visible wavelengths. The optical mirrors are based on a pure dielectric multilayer thin film coating design, which has been constructed for an incident angle of 45°. The mirrors can be used to reflect images, light sources and laser radiation.
Dielectric optical mirrors are constructed by alternated deposition of thin layers of dielectric materials with a different refractivity, one upon the other. Because dielectric optical mirror coatings show an angle dependent reflectivity and a physically limited bandwidth of the reflectivity range, such kind of optics are always optimized for an intended optical wavelength or a wavelength region, and at the same time for a defined incident angle or a number of incidence angles. Dielectric mirrors generally do not offer such a very broadband reflection like some metal coated mirrors do, but they feature a significantly higher optical reflectivity for the optimized wavelength ranges. This is of great importance for many optical uses. When we designed our dielectric SHR mirrors, we focused on the VIS-wavelength. We optimized the mirror design for the most commonly demanded incident angle of 45° and for high reflectivity in this optical spectrum. In addition to that the SHR mirrors feature a very broadband optical transmission the infrared spectrum up to 2,5µm so they can also be used as high performance 45° infrared filters or as dichroic beamsplitters to split the visible from the infrared spectrum.
This feature and the low absorption of the dielectric coating layers also enable the SHR mirrors to be used as a laser mirror or light source combiner for lasers and light of different wavelengths. This is possible even at increased laser beam powers, because the absorption of the dielectric coatings of the mirrors in the nominal spectrum is negligible. For information about what laser beam power can be reflected with our dielectric mirrors, please ask our engineers and let them know the details such as laser wavelength, laser beam diameter and laser beam power. We will check, whether the SHR mirrors are suitable to be used as a laser mirror in your special application without modifications. Also an optimized design for polarized light (undefined for the standard SHR) is possible.
A good thermal resistance of the thin film coated materials used for the SHR mirrors in addition to the temperature resistant high quality of the borosilicate glass substrate material our SHR mirrors are coated on, allow the operation at increased temperatures of up to approximately 360°C, provided that the heating up process is uniform and the temperature gradients over the mirror are within the allowed range of the substrate material.
At adequate quantities, as it is possible for nearly all of our optical coatings, we can also manufacture dielectric front surface mirrors with a customized optical design for individual requirements. Whether you need optimized dielectric optical mirrors for laser applications or a design that filters infrared light more efficiently or whether you need a special mirror flatness, all this is possible. Within certain physical limitations, we can control both, the optical reflectivity range and the angles of incidence of the dielectric coating construction. Also a manufacturing with focus on polarization optimization of the mirrors is available. This is often required for laser beam redirecting mirrors and it is undefined for the standard SHR mirrors. Please contact our engineers for support or information or send us your detailed enquiry.
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