Silicon Optical Windows

Silicon Optical Windows Precision Silicon optical windows - customer made to your specification

Silicon Optical Windows and Reference Bars
Silicon Windows and Reference Bars
For the past 10 years, Zygo has been the supplier of choice to Thales UK's optronics business for its sapphire windows needs. Thales UK has consistently found Zygo able to deliver high performance, high quality windows on time and on budget in support of our Naval projects.
– Thales UK
Silicon windows have good transmission in the range from 1.2 to 7.0 µm, with little or no distortion of the transmitted signal. Silicon has an advantage over other IR materials due to its low density (about half that of Zinc Selenide or Germanium), making it ideal for optical systems where weight is a significant factor. Silicon windows are also more robust and less brittle than Germanium windows, and have high thermal conductivity.


Zygo has a long tradition of manufacturing custom-made optical windows, using silicon and other materials, for a wide variety of applications, including, but not limited to:

• Amplifier Slabs, discs and rods

• Debris Shields

Laser fusion optics

Reference surfaces

• Intelligence, surveillance & reconnaissance


Zygo has developed a wide range of manufacturing processes to accommodate optical windows operating in the infrared (IR), visible, and ultra-violet (UV) parts of the spectrum. Similarly, Zygo has experience with multi-spectral applications, combining IR and visible. Optical windows can be provided with or without thin film coatings

• Infrared (IR) windows

• Ultra-violet (UV) windows

• Visible windows


Zygo can process these types of windows for components ranging in size from a few millimeters to greater than 1 meter.


In addition to Silicon windows, Zygo has the capability to process a wide range of materials to fabricate optical windows from other materials. Other window products include, but are not limited to:

Cleartran windows (water-clear Zinc Sulfide - ZnS)

Germanium windows

Glass windows (fused silica, BK7, etc.)

Sapphire windows (various crystal orientations)

Zinc selenide windows (ZnSe)

Inquiry/Quote Form – Optical Windows
Please use the form below to contact us with any questions you have regarding optical windows, or any of Zygo's optical products, services, or capabilities. You may send any additional information, including specifications and/or prints, to: