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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.

Features

Reduces reflection from 36% to 1% per surface
Constructed of hard, durable and non-radioactive materials
Meets MIL-C-48497

Specifications

General Specifications
Thickness	1.0±0.2 mm
Diameter Tolerance	+0/-0.1 mm
Min. Clear Aperture	90% of outside dimension
Substrate Material	Germanium (other substrates available
Flatness	2 waves at 632.8 nm
Parallelism	< 10 arc minutes
Sufrace Quality	60/40 per MIL-C-48497A
Coating Quality	60/40 per MIL-C-48497A
24-hour humidity	per MIL-C-48497A
Moderate Abrasion	per MIL-C-48497A
Adhesion	per MIL-C-48497A
Operating Temperature	-62°C to +71°C
Mechanical	Unmounted
Optional	Mounted in threaded ring

AR Coating	25 mm Ø	50 mm Ø
3-5 µm coated Germanium Window	GEBBAR-3-5-25	GEBBAR-3-5-50
8-12 µm coated Germanium Window	GEBBAR-8-12-25	GEBBAR-8-12-50
8-14 µm coated Germanium Window	GEBBAR-8-14-25	GEBBAR-8-14-50
2-14 µm coated Germanium Window	GEBBAR-2-14-25	GEBBAR-2-14-50