VIS-EXT AR Coated Sapphire Window for protective viewports ,D33×T3mm
Sapphire is a single crystal material that has excellent light transmission properties and can work in the visible and infrared light ranges. It has high hardness, high corrosion resistance, high heat resistance and good mechanical strength. It has a good transmittance in the visible range, usually more than 80%. In the infrared range, especially in the near infrared and mid-infrared bands, its transmittance is very high, which can reach more than 90%.
Sapphire windows with VIS-EXT anti-reflection (AR) coating are high-performance optical components engineered for extreme environments. Renowned for their exceptional durability, extreme hardness, and high transmission across a broad spectrum, they are ideal for demanding applications in aerospace, defense, and industrial sectors. The AR coating minimizes reflection losses, maximizing light throughput from the visible to the extended infrared (EXT) range while reducing glare. Consequently, they are widely employed as protective viewports for sensitive sensors, laser systems, scientific instruments, and high-pressure chambers, ensuring reliable performance in harsh conditions.
Technical parameters of sapphire window
Diamension | 33.0mm |
Thicknesses | 3.0mm |
Shape | Round |
Dimension tolerance | +0/-0.1mm |
Thickness tolerance | ±0.05mm |
Surface quality (scratch & dig) | 80/50,60-40, 40-20, or better |
Surface accuracy | λ/2, λ/4 or better |
Parallelism | 3' ,30'' |
Bevel | 0.1~0.3mm x 45 degree |
Clear aperture | >85%,>90% |
Coating | VIS-EXT (350-700nm) |
Coating Specification | Ravg <0.5% @ 350 - 700nm |
Material properties of Sapphire
Optical Properties | |
Transmission Range | 0.2-5μm |
Ne Refractive index@Ne | 1.7771 |
Structure | trigonal system |
Physical Properties | |
Density[g/cm3] | 3.98 |
Melting Point [deg C] | 2030 |
Thermal Conductivity[W/(m×deg C)] | 25.2 |
Thermal Expansion[deg C-1 ] | 5.66*10-6 |
Specific Heat Capacity[J/(kg×deg C)] | 0.7610*103 |
Young's Modulus[GPa] | 34-37 |
Volume elasticity coefficient[GPa] | 250 |
Poisson Coefficient | 0.309 |
Chemical Properties | |
Molecular Weight/ g/mol | 101.96 |
Solubility | 98*10-6 |
Changzhou Nova Import-Export Co.,Ltd is specialized in the end-to-end custom manufacturing of precision optical and imaging components, engineered to meet the exact requirements of your application. Our team partners with you from the initial concept phase through to final production, offering scalable solutions for both prototype development and high-volume manufacturing runs.
Our core capabilities include:
Full Customization: Tailored dimensions, material selection, and specialized coatings.
Superior Surface Quality: High-precision polishing achieving exceptional flatness and finish.
Exacting Tolerances: Manufacturing of complex geometries with tight tolerances for demanding specifications.
Scalable Production: Seamless transition from low-volume prototypes to full-scale production
