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High Durability Anti-Reflection (HDAR) Coated Fused Silica Windows

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  • HDAR Coating Achieves Severe Abrasion Requirements of MIL-C-675C
  • Low Reflectivity Across the VIS-NIR
  • Ideal for Use in Harsh Environments
  • Uncoated Fused Silica Windows Also Available

High Durability Anti-Reflection (HDAR) Coated Fused Silica Windows feature precision fused silica substrates with rugged HDAR coatings where frequent handling or cleaning are required. Similar to diamond-like carbon (DLC) coatings, the HDAR coatings are designed to withstand temperature cycling from -80 to +160°F, high humidity for 24 hours, salt spray for a continuous period of 24 hours, and salt solubility for an immersion period of 24 hours. These coatings are deposited on fused silica which has excellent mechanical and thermal stability, ensuring high performance even in harsh environments. High Durability Anti-Reflection (AR) Coated Fused Silica Windows are ideal for aerospace, defense, and industrial applications, as well as any optical application requiring durable protective windows.

Common Specifications

Bevel:
Protective as needed
Edges:
Fine Ground
Knoop Hardness (kg/mm2):
522
Parallelism (arcsec):
<5
Poisson's Ratio:
0.16
Young's Modulus (GPa):
73
Abbe Number (vd):
67.8
Coating:
Hardened VIS-NIR (400-1100nm)
Coating Specification:
Ravg <1.5% @ 400 - 1100nm
Rabs <2.0% @ 400 - 1100nm
Index of Refraction (nd):
1.458
Substrate:
Surface Quality:
20-10
Transmitted Wavefront, P-V:
λ/10
Wavelength Range (nm):
400 - 1100
Coating Temperature (°F):
-80 to +160 per MIL-M-13508C Paragraph 4.4.4
Coefficient of Thermal Expansion CTE (10-6/°C):
0.52 (+5 to +35°C)
0.57 (0 to +200°C)
0.48 (-100 to +200°C)
Density (g/cm3):
2.20
Coating Abrasion:
Severe, per MIL-C-675C Paragraph 4.5.10
Coating Adhesion:
Per MIL-M-13508C Paragraph 4.4.6
Coating Humidity:
≥24 Hours per MIL-C-675C paragraph 4.5.8
Coating Salt Solubility:
≥24 Hours Immersion per MIL-C-675C paragraph 4.5.7
Coating Salt Spray:
≥24 Hours per MIL-C-675C paragraph 4.5.9

Products

Dia. (mm)  Thickness (mm)   Coating   Compare   Stock Number   Price  Buy
5.00 1.00 Hardened VIS-NIR (400-1100nm)
12.50 1.50 Hardened VIS-NIR (400-1100nm)
25.00 3.00 Hardened VIS-NIR (400-1100nm)
50.00 3.00 Hardened VIS-NIR (400-1100nm)

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