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Optical Window, Germanium, 25.0 mm Diameter, 3.0 mm Thick, 3-12 µm

Model: GEW13AR.20

$481

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Product Series Overview

Germanium Optical Windows

The GEW13AR.20 is a 3 μm to 12 μm antireflection coated, 25.0 mm in diameter and 3.0 mm thick Germanium window. Germanium has high index of refraction, making it a perfect choice for applications that require low dispersion. The AR coating provides high transmission from 2 μm to 16 μm while reducing the high surface reflectivity of the substrate. With its broad transmission range and opacity in the visible spectrum, Germanium is a popular choice for MWIR (Mid-Wave Infrared) laser applications.

Specifications

Technical Specs

Diameter

25.0 mm
Material

Optical Grade Germanium
Antireflection Coating

3-12 µm
Surface Flatness

λ/20 @ 10.6 µm
Surface Quality

40-20 scratch-dig
Thickness

3.0 mm
Thickness Tolerance

± 0.1 mm

Parallelism

< 1 arc minute
Cleaning

See How to Clean Optics
Clear Aperture

Central 90% of diameter
Diameter Tolerance

+0.0/-0.1 mm
Coating Code

AR.20

Diameter

25.0 mm
Material

Optical Grade Germanium
Antireflection Coating

3-12 µm
Surface Flatness

λ/20 @ 10.6 µm
Surface Quality

40-20 scratch-dig
Thickness

3.0 mm
Thickness Tolerance

± 0.1 mm

Parallelism

< 1 arc minute
Cleaning

See How to Clean Optics
Clear Aperture

Central 90% of diameter
Diameter Tolerance

+0.0/-0.1 mm
Coating Code

AR.20

Resources & Downloads

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