Sydor Optics provides various optical flats – also known as “reference flats,” “test flats” or “test plates” – to meet precision tolerances for the most demanding and exacting applications. An optical flat is manufactured to be extremely flat, and used as a reference for measuring the flatness of other optics with a monochromatic light source or in interferometry applications. Some people also use word “optical flat” or “plano optics” interchangeably with other flat optical components such as optical windows or as substrates for optical mirrors.

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Single-sided optical flats are flats that are precision polished on only one side. The other side is left clear, but it is not polished to specification. The polished side of the optical flat may be used to test the flatness of other optical materials such as optical mirrors or wedges. It can also be used as a substrate for optical windows.

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Sydor Optics manufactures IR windows utilizing a range of infrared materials suited for the NIR, SWIR, MWIR and LWIR spectrums ranging from 0.75µm to 15µm for applications including thermal imaging, mineral & gas detection and monitoring and other forward-looking infrared (FLIR) imaging applications.

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When it comes to using optical flats for evaluating the flatness accuracy of an unknown optical surface, it’s best to choose a known vendor: Sydor Optics has decades of experience in custom fabrication and resurfacing/refinishing of optical flats.

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As with other products from Sydor Optics, optical flats are fabricated in custom sizes with different coating and beveling options, and can even be polished to include a slight wedge to reduce back reflection. Whether you need λ/4, λ/10, or λ/20 single-sided or double-sided plano optics, Sydor Optics will meet your needs for precision and accuracy.

Aside from standard size glass wafers such as 100mm, 150mm, 200mm and 300mm, Sydor Optics can provide custom wafers with diameters up to 450mm and thin wafers with thicknesses down to 0.1mm.

Newport

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Double-sided plano optics are flats that are precision polished to a known flatness on both sides. Because optical flats are used to test the flatness of an unknown surface, either side of a double-sided optical flat can be used for testing, or it could also be used as a substrate for a window.

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Plano optics can be accompanied by a protective case and Sydor Optics can also provide supporting documentation and data upon request.

Best practices suggest that when coating or setting up an optical component, it’s best to use a witness sample, also called a “test piece,” to ensure that the actual part will match your specific coating specifications and your application.

With careful usage, storage and cleaning an optical flat should provide years of use. However, accidents can happen and normal wear and tear is inevitable. Depending on the type and frequency of usage, the flatness and quality of an optical flat may diminish over time. In certain circumstances, it makes sense to refinish or resurface an optical flat to not only extend its life but also to ensure that your optical flat produces an accurate measurement every time.

Edmund Optics

Reflect and transmit any combinations of wavelengths with precision plate beamsplitters. UV, VIS, or IR, Polarized or Unpolarized, 10:90 – 90:10 Reflection:Transmission(R:T).

Optical wedges with ± 10 arc seconds of wedge angle tolerance. Superior craftsmanship made to your specifications in a variety of shapes, sizes, and materials.

Based upon customer demand, Sydor Optics offers Optical Flats made from the following substrate materials. Of course, if you don’t see a material you need, please contact a Sales Engineer, who will gladly discuss additional options that may be available.