Germanium Optical Windows
Germanium Optical Windows
Germanium windows are ideal for IR applications at a broad range of wavelengths, including use in lower power CO2 lasers. Germanium also has low dispersion, ideal for imaging applications. The windows feature an AR coating providing high transmission from 3 to 12 µm.
- Ideal for near-IR applications
- Broadband 3 to 12 µm anti-reflection coating
- Ideal for applications requiring low dispersion
- Great for low power CO2 laser applications See All Features
Specifications
- MaterialOptical Grade Germanium
- Surface Flatnessλ/20 @ 10.6 µm
- Surface Quality40-20 scratch-dig
- Cleaning
- Clear Aperture10GE20: central 85% of diameter
GEW: central 90% of diameter - Diameter Tolerance10GE20: ±0.2 mm
GEW: +0.0/-0.1 mm - Thermal Expansion Coefficient6.1 x 10-6 K-1 @ 298 K
- Thermal Limit59 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.
