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IR-Blocking Filters
Optics Balzers' IR-Blocker effectively removes unwanted infrared radiation produced by broadband light sources. A dielectric oxide coating design provides excellent transmission over the entire visible spectrum, without distorting the spectral emission of the light source. Filters can be optimized according to the spectral characteristic of the source and are particularly well suited for use in applications with high thermal loads.
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Our strengths:
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The splitting occurs uniformly on the entire mirror surface. Therefore the beam splitter can be installed in any location of a light path under an angle of 45° without interfering the optical imaging. The Neutral Beamsplitters are composed of absorption free dielectric coating. All Neutral Beamsplitters are available with a broadband antireflection coating on the rear side, on request.
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Dielectric coatings offer specific optical and functional properties:
Metallic Coatings offer specific optical and functional properties:
Avoiding defects is always important in optical applications; cleanliness is at the heart of everything we do. However, for certain applications, it is even more important that the defect level is as low as possible.
Such applications include sensor lids, where the coated substrate is close to the sensor elements with pixel sizes down to the micron range. For laser coatings with high laser power, coating defects are the starting point of laser-induced damage to the coating. In many biomedical applications, any kinds of particles and contamination are unacceptable.
Low Defect Anti-Reflective Coatings
Optical coatings on lids for high performance digital image sensors require very low densities of small defect sizes. Broadband anti-reflective coatings with low residual reflections and spectrally neutral performance eliminate ghost effects. Optics Balzers offers superior low defect coatings and components produced in the cleanroom area.
For dielectric coatings, be it for any type of filter or AR coatings, a structured photoresist and lift-off technology are used: at a low temperature, the coating is deposited onto the substrate which is already coated with the patterned photoresist, and the coating is removed by lift-off together with the photoresist. Recent advances allow us to apply this technology for very large filter thicknesses of > 10 µm. Chrome-based layers are typically removed by wet etching: After coating, the chrome layer is covered with a photoresist, the photoresist is patterned and the chrome layer is removed chemically at the opened surfaces. This process produces very well-defined edges with a jaggedness of < 1 µm. Instead of wet etching, reactive ion etching can be used to produce – much finer – structures in dielectric materials. For larger structures, a more cost-effective masked coating can be used as well.
For quality control, an automated optical inspection system is used, which automatically checks for defects and confirms that the specified pattern dimensions were produced.
Optics Balzers offers patterning solutions for all high quality optical coatings described above. Depending on the product and its applications, various patterning techniques are available to meet a broad range of customer requirements for feature sizes and shapes:
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