Czech Rep.
Manufacturer/ Producer
Czech Rep.
Calomel IR polarizers are the only crystalline prismatic polarizers applicable in the mid-IR and LWIR spectral regions on the market. Beside the Calomel prismatic polarizers, only wire grid systems are currently available with no other birefringent crystal transparent above 6µm. The combination of Calomel´s two unique material properties: a high value of birefringence (Δn=0.683) and a wide transparency range (0.4μm-17μm), makes it a great material for mid-infrared polarizers, beam splitting and phase delay components. Another significant advantage of Calomel crystal is that the material is optically positive, so GF polarizer transmits the ordinary (o) beam, whereas the extraordinary (e) one is reflected to the side and may be used for the application if required. This is an exceptional feature of mercurous chloride material.
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Calomel IR polarizers are the only crystalline prismatic polarizers applicable in the mid-IR and LWIR spectral regions on the market. Beside the Calomel prismatic polarizers, only wire grid systems are currently available with no other birefringent crystal transparent above 6µm. The combination of Calomel´s two unique material properties: a high value of birefringence (Δn=0.683) and a wide transparency range (0.4μm-17μm), makes it a great material for mid-infrared polarizers and phase delay components. Our Calomel Wollaston polarizer is designed for the most demanding applications that require two separately accessible, high purity orthogonal linearly polarized beams. The air-spaced prism pair is assembled into a 30.0 mm diameter black anodized aluminium housing with a 10x10 mm clear aperture.
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Calomel is suitable for the construction of acousto-optical devices. To illustrate, Calomel´s AO figure of merit is comparable with that of a tellurium dioxide TeO2 and more than one order better than that of lead molybdenate PbMoO4. The transparency of Calomel (0.38 to 20µm) enables the use of AO units in a broad spectral range (compared with TeO2) covering a very interesting thermal IR region. No acousto-optical tuneable filter for interesting spectral TIR region is currently available on the market.
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BBT – Materials Processing offers a wide spectrum of both, polarizing and non-polarizing optical elements for operating light in the MWIR and LWIR spectral regions. Custom-made prisms are available in different shapes, angles, and configurations and may be used for a wide range of applications. We offer right-angle, dove, penta, and custom-angled different prisms with various dimensions. Optical windows made of Calomel are available as flat or wedged, depending on the customer´s needs. They may be used in IR optical systems, where other materials transparent in infra-red struggle with low damage threshold or transparency. We also provide manufacturing possibilities for other different types and shapes, depending on the customer´s needs. Please feel free to contact us for inquiry. We offer Antireflective (AR) coating for calomel optics, currently available for region 2-5μm spectral region. Solutions above >5μm are under development. (Prisms, Windows, Blocks,Waveplates etc.)
Request for a quoteBBT-Materials Processing Ltd. is a private SME technological company dedicated to development and production of high performance mid-IR and LWIR polarization optics, phase delay components and acousto-optical substrates for a wide range of applications. ABOUT CALOMEL CRYSTALS Calomel is a crystal material transparent from VIS (0.4µm) up to MWIR (17µm) with a very strong birefringence (Δn=0, 55). These parameters make it a great candidate for mid-IR optics, polarization optics and acousto-optical components POLARIZATION and PHASE DELAY OPTICS Birefringent crystal optics for mid-IR spectral range (0.4-17µm): polarizers, windows, prisms, adjustable phase delay components, and custom products based on Calomel crystals. Polarizers modify light, making it possible to get better contrast, brightness, more details and generally a new kind of information COUSTO OPTICS Calomel substrates for AO applications (AOTF, AOM, AOD). High figure of AO merit M2 and transparency in mid-IR and LWIR. USTOM PRODUCTS Windows, prisms, wedges, cubes and other custom components produced by customer requirements and application needs.
Manufacturer/ Producer
Doubicka 11, Prague 8, Czech Republic
18400 Prague - Czech Rep.
United Kingdom
Sapphire (Al2O3) is one of the hardest minerals and optical materials available for use in the range from UV up to 5µm. Sapphire is birefringent and if its use is for critical optical application then the crystal might have to be cut along the zero degree plane, or C-Cut. Random cut is usually cut along a plane that is 60° off-axis as the growth in this direction is the easiest to grow. Random cut is anything that is not the C-Cut angle. Sapphire can fluoresce depending upon the concentration of other minerals within the lattice, for example Iron (Fe) or Chromium (Cr). Clear Sapphire might fluoresce orange when illuminated by UV light if impurities are in the crystal. Fluorescent free Sapphire has to be grown from 'pure' feedstock and seed and in an environment that cannot place impurities into the lattice. Click PDF link to read more …...
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Knight Optical can offer Ground Glass Diffusers for use within Photography. We supply a range of Ground Glass Diffusers for a range of applications. All individually QA checked and metrology tested for quality to ensure parts meet customer specification. Supplied in a range of sizes and shapes with custom coatings tailored to meet your individual applications. Knight Optical supply precision optical components to customers within photography. Ground Glass Diffusers are used in to diffuse the flash from cameras to prevent photos with harsh light and hard shadows to soften and improve the appeal of the image. Diffusers are also used in lightning systems to prevent glare from computer screens, the manufacture of lightboxes for advertising, viewing x-rays, and other applications. For more information read PDF…
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Knight Optical has successfully launched a range of Stock Colour Glass Filters, for use within Entertainment and Design Industry. Within the LED Lighting Industry, Colour Glass Filters can used as downlights within a stage production by filtering the different visible wavelengths and filter out unwanted light from a white light source to provide desired coloured light that is perceived by an audience to be a highly saturated or intense colour. This is just what you need to help set the atmosphere for whatever event you’re planning We hold a massive inventory of Bandpass, Long pass, Short pass, and Mounted Colour Glass Filters. Stock sizes of 25mm diameter; and 50x50mm squares x 1mmthk with larger sizes of 300x300mm available on most of our filters as a custom option. Custom shapes and sizes at short notice, in most cases turned around within 1-2 week. Alternative thickness substrates available. For more information read the PDF …..
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Knight Optical offers a range of precision optical components for use in IPL (Intense Pulsed Light) applications. The most common usage of IPL systems are typically used as photo epilators.Custom Ceramic Reflectors are a key component for this application. The xenon flash lamp which are typically used emit light in 360 degrees. However utilising ceramic reflectors which are light reflectors with a U channel means that light which would normally be wasted i.e. shining backwards is now refocused down into the filters and light guides. Knight Optical provides ceramic reflectors which are typically moulded from alumina. This choice of material is down to its ability to withstand thermal stresses and high reflectivity values. For more information read PDF
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