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76.2mm Dia., 3mm Thick, 8-12μm AR Coated & DLC Coated, ISP Optics Germanium (Ge) Window | DLC812-GE-W-76-3

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Protective as needed
Clear Aperture (%):
Clear Aperture CA (mm):
Diameter (mm):
76.20 +0.00/-0.13
Thickness (mm):
3.00 ±0.13
S1: DLC Coating
S2: BBAR (8000-12000nm)
Coating Specification:
Tavg ≥90.0% @ 8 - 12μm
Tmin ≥80.0% @ 8 - 12μm
Coefficient of Thermal Expansion CTE (10-6/°C):
Density (g/cm3):
Fine Ground
Index of Refraction nd:
4.002 @ 11µm
Knoop Hardness (kg/mm2):
Parallelism (arcmin):
Poisson's Ratio:
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Surface Flatness (P-V):
λ/10 @ 10.6μm
Surface Quality:
Protective Window
Wavelength Range (nm):
2000 - 14000
Young's Modulus (GPa):
Coating Abrasion:
AR: Moderate, per MIL-C-48497C<br/>DLC: Severe, per MIL-C-48497C
Coating Adhesion:
AR: per MIL-C-48497C<br/>DLC: per MIL-C-48497C
Coating Humidity:
AR: 24 Hours per MIL-C-48497C<BR/>DLC: 24 Hours per MIL-C-48497C
Coating Salt Solubility:
AR: N/A<br/>DLC: ≥24 Hours Immersion per MIL-C-675C
Coating Salt Spray:
AR: N/A<br/> DLC: ≥72 Hours per MIL-C-675
Coating Solubility and Cleaning:
AR: per MIL-C-48497<br/>DLC: per MIL-C-48497
Coating Temperature (°F):
AR: -80 to +160 per MIL-C-48497C<br/>DLC: -80 to +160 per MIL-C-48497C
Coating Wiper Durability:
AR: N/A<br/>DLC: ≥1,000 Wipes of Sand/Slurry per TS-1888
Model Number:

Regulatory Compliance

RoHS 2015:
Certificate of Conformance:

Product Family Description

  • Minimal Chromatic Aberration Due to Low Dispersion
  • Uncoated Transmission from 2 – 16µm
  • Available with BBAR or DLC Coating for 8 – 12µm
  • Due to material supply chain disruptions with germanium, there may be increased lead times and price changes on our germanium products. For more information, please contact our customer service team.

ISP Optics Germanium (Ge) Windows provide transmission and low absorption through the Long-Wave Infrared (LWIR) spectrum, making it useful for thermal imaging applications. Germanium features a Knoop Hardness of 780, making it ideal for infrared applications requiring rugged optics. These windows are available uncoated, Broadband Anti-Reflection (BBAR) coated for 8 – 12µm, or Diamond-Like Carbon (DLC) coated for 8 – 12µm. ISP Optics Germanium Windows are ideal for integration into thermal imaging systems, especially those that require rugged optics. Germanium is subject to thermal runaway, meaning that the transmission decreases as temperature increases. As such, these germanium windows should be used at temperatures below 100°C.