Compare Model Drawings, CAD & Specs Diameter Antireflection Coating Thickness Parallelism Availability Price
10GE20
$403
In Stock
 10GE20 25.4 mm Uncoated 2.0 mm < 3 arc minute
In Stock
 $403
GEW13AR.20
$481
In Stock
 GEW13AR.20 25.0 mm 3-12 µm 3.0 mm < 1 arc minute
In Stock
 $481
GEW15AR.20
$1,118
7 Weeks
 GEW15AR.20 50.0 mm 3-12 µm 3.0 mm < 1 arc minute
7 Weeks
 $1,118
GEW16AR.20
$1,876
In Stock
 GEW16AR.20 74.9 mm 3-12 µm 5.0 mm < 1 arc minute
In Stock
 $1,876

Specifications

  • Material
    Optical Grade Germanium
  • Surface Flatness
    λ/20 @ 10.6 µm
  • Surface Quality
    40-20 scratch-dig
  • Cleaning
    See How to Clean Optics
  • Clear Aperture
    10GE20: central 85% of diameter
    GEW: central 90% of diameter
  • Diameter Tolerance
    10GE20: ±0.2 mm
    GEW: +0.0/-0.1 mm
  • Thermal Expansion Coefficient
    6.1 x 10-6 K-1 @ 298 K
  • Thermal Limit
    59 W m-1 K-1 @ 293 K

Features

3 to 12 µm Broadband Coating

The AR.20 broadband anti-reflection coating offered with our Germanium parallel windows is effective from 3 µm to 12 µm.

Germanium Optical Properties

Germanium Optical Windows have good transmittance from 2 to 16 µm uncoated, and very low peak absorption, making the material an excellent candidate for use in C02 laser cavities. Germanium also has high opacity across the entire visible spectrum, making the windows ideal for applications where transmission of only IR wavelengths is desired.

Resources

Selection Guides

Technical Notes