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IR Window(Germanium)

A window with a substrate made of single-crystal germanium. Low absorption at the infrared region up to 20μm. With anti-reflective (AR) coating on the both faces, the product delivers superior transmission properties suitable for windows.

- The AR-coated model offers high transmission properties for a wide range of light (3μm-5μm).
- The product can be used as a window for specimen observation, laser irradiation, etc.

Brochure PDF

Typical Specifications

Model GEWI
Wavelength Range 3-10μm 5-9μm 2-13μm
AR Coating Y Y N
(One Side)
< 4.0% < 2.0% -
Size Φ25 x 1tmm, Φ30 x 1tmm
Substrate Single-crystal germanium
Parallelism Within 3 minutes
Scratch-Dig 60-40
Effective Diameter 80% of the actual diameter

Wavelength Characteristics of Reflectance(AR-coated_3-10μm)

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Wavelength Characteristics of Reflectance(AR-coated_5-9μm)

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Wavelength Characteristics of Reflectance(AR-uncoated)

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Ordering Instructions

- IR Window (Germanium)

Order format:

1) Product: IR Window (Germanium)
Order format example: GEWI-N-A

(1) AR-coating
A: 3-5μm B: 5-9μm N: Uncoated
(2) External diameter of substrate A: Φ30mm C: Φ25mm
* External diameter and thickness can be customised.

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