Broadband AR Coating on Germanium

From Andover

Andover produces a non-radioactive dielectric multilayer coating designed to reduce the reflection of Germanium substrates in the infrared. Reflection is reduced from 36% per surface to less than 1% per surface.

Constructed of hard, durable first-surface dielectric coatings on optical-quality germanium substrates, these filters will withstand cleaning and handling associated with any high-quality optical component.

For your convenience and economy, we offer the filters in two standard sizes: 25 mm and 50 mm dia. However, we can produce custom sizes and shapes, as well as custom optical characteristics. Contact our expert on the right for a quotation.

Reduces reflection from 36% to 1% per surface
Constructed of hard, durable and non-radioactive materials
Meets MIL-C-48497
General Specifications
Thickness1.0±0.2 mm
Diameter Tolerance+0/-0.1 mm
Min. Clear Aperture90% of outside dimension
Substrate MaterialGermanium (other substrates available
Flatness2 waves at 632.8 nm
Parallelism< 10 arc minutes
Sufrace Quality60/40 per MIL-C-48497A
Coating Quality60/40 per MIL-C-48497A
24-hour humidityper MIL-C-48497A
Moderate Abrasionper MIL-C-48497A
Adhesionper MIL-C-48497A
Operating Temperature-62°C to +71°C
OptionalMounted in threaded ring
AR Coating25 mm Ø50 mm Ø
3-5 µm coated Germanium WindowGEBBAR-3-5-25GEBBAR-3-5-50
8-12 µm coated Germanium WindowGEBBAR-8-12-25GEBBAR-8-12-50
8-14 µm coated Germanium WindowGEBBAR-8-14-25GEBBAR-8-14-50
2-14 µm coated Germanium WindowGEBBAR-2-14-25GEBBAR-2-14-50
Thermal Imaging
Detector Windows
Dewar Windows


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Sales Manager
+7 495 9381866
Fax: +7 495 9381907
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