Custom Optical Window Fabrication

Optical windows are typically fabricated from two flat (or plano) polished surfaces that are optically transparent and intended to separate, seal, or otherwise protect other components. The double-sided manufacturing process yields exceptional parallelism and transmitted wavefront making it ideal for visible windows in industrial and biomedical applications, as well as IR windows in infrared and military/defense applications.

Based upon decades of experience, and expertise in medical, defense, industrial and scientific fields, and with the largest collection of double-sided grinding and polishing machines in North America, Sydor Optics can fabricate and manufacture custom IR, UV and visible windows in a variety of custom sizes, shapes, and substrates.

Available Materials

Based upon customer demand, Sydor Optics offers optical windows 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.

Fused Quartz Windows

Fused Silica Windows

BOROFLOAT® (Borosilicate) Windows

B 270® Windows

N-BK7® (S-BSL7) Windows

Silicon (Si) Windows

Germanium (Ge) Windows

CaF2 / MgF2 Windows

Optical Window Manufacturing Limits

Manufacturing limits depend upon the part size and substrate material and should be used as a general reference. Please contact a Sales Engineer, who will gladly discuss our capabilities based on your specifications.



Diameter ≤ 750mm
Length / Width ≤ 600mm x 450mm
Thickness ≤ 100mm
Thickness Tolerance ± 0.01mm
Cosmetics (MIL-PRF-13830B) 60-40 to 10-5
Surface Roughness ≥ 3 Ǻ rms
Parallelism ≥ 1 arc second
Reflected Wavefront Error (RWE) – before coating ≥ 1/20 wave over clear aperture
Transmitted Wavefront Error (TWE)* – before coating ≥ 1/20 wave over clear aperture
Clear Aperture ≤ 95%
*Interferometric Scale Factor (ISF) of 0.5 – Single-Pass

Types of Optical Windows

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Ultraviolet (UV) Windows

Ultraviolet (UV) Windows

Ultraviolet windows are often used with laser instruments or other applications in medical, industrial and defense areas—or wherever UV energy needs to be blocked, filtered, or controlled. Sydor Optics can help determine the best substrates, UV coatings, and other optical properties and custom manufacture UV windows to best meet your specific requirements and applications.

Visible Windows

Visible Windows

Visible windows are designed for use in the visible spectrum: the type of light visible to the human eye. Visible windows are ideal for protecting optical systems and other optical components, imaging or display systems, or other applications—without adding magnification power or causing significant distortion. Sydor Optics can custom manufacture visible windows in a variety of shapes, sizes, and substrates for various optics applications, including those with extreme temperatures or other challenging conditions.

Infrared (IR) Windows

Infrared (IR) Windows

Infrared windows are often used in FLIR, FTIR spectroscopy, medical systems, thermal imaging, or other optics applications within the infrared light spectrum. IR windows can help protect your employees and equipment—without introducing additional magnification into the optical system. Sydor Optics can custom manufacture IR windows in a variety of shapes, sizes, substrates, and coatings for various infrared applications.

Anti-Reflective (AR) Windows

Anti-Reflective (AR) Windows

Anti-Reflective windows reduce glare and reflection to allow superior light transmission—while providing excellent protection. AR windows help drastically reduce or eliminate back reflections, ghost images and glare, and reduce reflection down to fractions of a percent. Anti-reflective windows can also be used to optimize various wavelengths for better optical performance. Sydor Optics can custom fabricate AR windows in various shapes and sizes —using various substrates and coatings—to best suit your needs.

Window Shapes

Below are some of the standard optical window shapes that Sydor Optics customers frequently order. Of course, Sydor Optics can manufacture custom optical windows — with various shapes and sizes — using CNC Glass Machining or Laser Machining capabilities to meet your specific needs.

Circular Windows

Square Windows

Rectangular Windows

Elliptical Windows

Window Applications

Turret Windows

Vacuum Windows

Debris Shields

Sight Windows

Viewing Windows

Protective Windows

Instrument Windows

Laser Line Windows