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25.4mm Dia., 4mm Thick, 30' Wedge, ISP Optics Germanium (Ge) Wedged Window | GE-WW-25-4

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Germanium (Ge) Wedged Windows

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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):
4.83
Edges:
Fine Ground
Index of Refraction nd:
4.002 @ 11µm
Knoop Hardness (kg/mm2):
780
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):
2λ @ 633nm
Surface Quality:
60-40
Type:
Protective Window
Wavelength Range (nm):
2000 - 14000
Young's Modulus (GPa):
102.7
Wedge Angle:
30' ±15'
Model Number:
GE-WW-25-4

Regulatory Compliance

RoHS 2015:
Compliant
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Certificate of Conformance:
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Reach 240:
Compliant
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Product Family Description

  • 30 Arcmin Wedge
  • High Transmission from 2 – 10µm
  • Ideal for Infrared Applications Requiring Rugged Optics
  • Precision Flat Germanium Windows Also Available
  • 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) Wedged Windows provide laser output protection for beam sampling applications and are used to eliminate fringe patterns from etalon effects as well as prevent cavity feedback. Germanium is insoluble, making it inert to water, air, alkalis and acids except nitric acid. Because germanium is subject to thermal runaway, these windows should be used at temperatures below 100°C. Germanium’s high density (5.33g/cm3) should be considered when designing for weight-sensitive systems, and its high index of refraction (~4.0 from 2 - 14μm) should be considered for applications looking to maximize throughput. ISP Optics Germanium (Ge) Wedged Windows offers a broad transmission range and a Knoop Hardness of 780 (approximately twice that of magnesium fluoride), making it suitable for infrared applications requiring rugged optics.