Germanium (Ge) Optical Windows

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Germanium (Ge) Optical Windows Precision Germanium optical windows - customer made to your specification

Optical Components by ZYGO's Optics business segment
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
Germanium windows, opaque in the UV and visible parts of the spectrum, have a broad transmission range and are well-suited for IR applications. Germanium is a very hard, high-density material - characteristics that are advantageous where robustness is needed. Germanium's high density also makes it heavy, something to be considered when designing it into optical systems where weight is a consideration. Another characteristic of Germanium is thermal runaway, which means that its transmissive properties decrease as temperature increases.


ZYGO has a long tradition of manufacturing custom-made optical windows, in a wide variety of materials, for many different applications applications, including, but not limited to:

• Amplifier Slabs, discs and rods

• Debris Shields

Laser fusion optics

• Reference surfaces


Medical/Life Sciences

Industrial OEM

• 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.


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


In addition to Germanium windows, ZYGO has the capability to process a wide range of materials to fabricate optical windows. Other materials for optical window products include, but are not limited to:

Cleartran windows (water-clear Zinc Sulfide - ZnS)

Glass windows (fused silica, BK7, etc.)

Sapphire windows (various crystal orientations)

Silicon windows

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:

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