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All Products / Optics / Windows and Diffusers / Visible Windows / High Durability Anti-Reflection (HDAR) Coated Fused Silica Windows
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50mm Dia., 3mm Thick, 400-1100nm HDAR Coated Fused Silica Window

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Stock #29-981 New 3-4 days
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€315,00
Qty 1-5
€315,00
Qty 6+
€252,00
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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
Coating Temperature (°F):
-80 to +160 per MIL-M-13508C Paragraph 4.4.4

Product Details

Type:
Protective Window

Physical & Mechanical Properties

Bevel:
Protective as needed
Clear Aperture (%):
90
Clear Aperture CA (mm):
45.00
Diameter (mm):
50.00 +0.00/-0.20
Thickness (mm):
3.00 ±0.10
Edges:
Fine Ground
Knoop Hardness (kg/mm2):
522
Parallelism (arcsec):
<5
Poisson's Ratio:
0.16
Young's Modulus (GPa):
73

Optical Properties

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: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Fused Silica
Surface Quality:
20-10
Transmitted Wavefront, P-V:
λ/10
Wavelength Range (nm):
400 - 1100

Material Properties

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

Regulatory Compliance

RoHS:
Compliant
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Certificate of Conformance:
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Product Family Description

  • 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.