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ISP Optics Silicon (Si) Windows

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

Common Specifications

Bevel:
Protective as needed
Clear Aperture (%):
85
Edges:
Fine Ground
Knoop Hardness (kg/mm2):
1150
Parallelism (arcmin):
<3
Poisson's Ratio:
0.265
Young's Modulus (GPa):
140
Index of Refraction (nd):
3.422 @ 5µm
Substrate:
Surface Flatness (P-V):
Surface Quality:
40-20
Coefficient of Thermal Expansion CTE (10-6/°C):
2.55
Density (g/cm3):
2.33

Products

Dia. (mm)  Thickness (mm)   Coating   Model Number   Compare   Stock Number   Price  Buy
12.70 1.00 Uncoated SI-W-12-1
12.70 2.00 Uncoated SI-W-12-2
25.40 1.00 Uncoated SI-W-25-1
25.40 3.00 Uncoated SI-W-25-3
25.40 4.00 Uncoated SI-W-25-4
38.10 1.00 Uncoated SI-W-38-1
50.80 1.00 Uncoated SI-W-50-1
50.80 2.00 Uncoated SI-W-50-2
12.70 1.00 BBAR (3000-5000nm) HDAR35-SI-W-12-1
25.40 1.00 BBAR (3000-5000nm) HDAR35-SI-W-25-1
25.40 3.00 BBAR (3000-5000nm) HDAR35-SI-W-25-3
25.40 5.00 BBAR (3000-5000nm) HDAR35-SI-W-25-5
50.80 4.00 BBAR (3000-5000nm) HDAR35-SI-W-50-4
50.80 5.00 BBAR (3000-5000nm) HDAR35-SI-W-50-5
50.80 6.00 BBAR (3000-5000nm) HDAR35-SI-W-50-6

Product Details

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.

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