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25.4mm Dia., 4mm Thick, Uncoated, ISP Optics Germanium (Ge) Window | GE-W-25-4

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Bevel:
Protective as needed
Clear Aperture (%):
85
Clear Aperture CA (mm):
21.59
Diameter (mm):
25.40 +0.00/-0.13
Thickness (mm):
4.00 ±0.13
Coating:
Uncoated
Coefficient of Thermal Expansion CTE (10-6/°C):
6.1
Density (g/cm3):
5.33
Edges:
Fine Ground
Index of Refraction nd:
4.002 @ 11µm
Knoop Hardness (kg/mm2):
780
Parallelism (arcmin):
<3
Poisson's Ratio:
0.28
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Germanium (Ge)
Surface Flatness (P-V):
λ/10 @ 10.6μm
Surface Quality:
40-20
Type:
Protective Window
Wavelength Range (nm):
2000 - 14000
Young's Modulus (GPa):
102.7
Type of Window:
Crystal
Model Number:
GE-W-25-4

Regulatory Compliance

RoHS:
Compliant
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Certificate of Conformance:
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Product Family Description

  • Minimal Chromatic Aberration Due to Low Dispersion
  • Uncoated Transmission from 2 – 16µm
  • Available with BBAR or DLC Coating for 8 – 12µm

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.