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25.4mm Dia., 3mm Thick, 3-5μm BBAR Coated, ISP Optics Silicon (Si) Window | HDAR35-SI-W-25-3

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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):
3.00 ±0.13
Coating:
BBAR (3000-5000nm)
Coating Specification:
R<sub>avg</sub> <0.5% @ 3 - 5μm<br/>R<sub>abs</sub> <1.5% @ 3 - 5μm
Coefficient of Thermal Expansion CTE (10-6/°C):
2.55
Density (g/cm3):
2.33
Edges:
Fine Ground
Index of Refraction nd:
3.422 @ 5µm
Knoop Hardness (kg/mm2):
1150
Parallelism (arcmin):
<3
Poisson's Ratio:
0.265
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Silicon (Si)
Surface Flatness (P-V):
2λ
Surface Quality:
40-20
Type:
Protective Window
Wavelength Range (nm):
3000 - 5000
Young's Modulus (GPa):
140
Model Number:
HDAR35-SI-W-25-3

Regulatory Compliance

RoHS:
Compliant
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Certificate of Conformance:
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Product Family Description

  • Transmission from 1.2 - 7μm
  • Available Uncoated or HDAR Coated for 3 - 5μm
  • Ideal for Weight Sensitive Applications

ISP Optics Silicon (Si) Windows provide transmission in the Near-Infrared (NIR) and Mid-Wave Infrared (MWIR) from 1.2 - 7μm. Silicon features a Knoop Hardness of 1150, making it harder and less brittle than Germanium. A High-Durability Anti-Reflection (HDAR) coating option increases the durability of the substrate while significantly improving transmission from 3 - 5μm, enabling use in harsh environments. ISP Optics Silicon (Si) Windows are ideal for weight-sensitive IR applications due to its low density of 2.329 g/cm3, which is half as dense as Germanium and Zinc Selenide. These windows are ideal for NIR imaging applications and are important for detection of sources radiating at a black body temperature of 700K.