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Sapphire Windows
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Our custom sapphire windows are machined from high-purity monocrystalline aluminum oxide (Al₂O₃), tailored for optical systems working under extreme high-temperature, corrosive chemical, abrasive and high-pressure conditions — environments where fused silica and BK7 optical glass fail to maintain consistent optical stability. Every production batch is supplied with lab-measured sapphire transmission curve test reports, which confirm flat, high transmittance performance spanning deep ultraviolet (190 nm) to mid-infrared (5.5 μm).
Parameters
Specification
Material
Synthetic sapphire
Dimension
0.5~300mm
Dimension Tolerance 0.005~0.10mm Surface roughness 0.2nm C. Axis Deviation +/-0.1° Surface quality 10/5 - 80/50 Infrared Transmission > 85%@633nm Flatness λ/4 Center Deviation 0.01mm Orientation C，A，R，M 
Product FAQ
Q1: What is the transmission range of uncoated sapphire windows?
A1: Uncoated single crystal sapphire windows feature a transmission curve covering 190 nm deep ultraviolet to 5.5 μm mid-infrared, with average transmittance over 85% between 300 nm and 3 μm. Dual-side anti-reflection coatings raise peak transmittance to over 98% at designated working wavelengths.
Q2: Why choose sapphire windows over fused silica windows?
A2: Sapphire offers far higher hardness, better thermal shock resistance and extended mid-infrared transmission range compared to fused silica. It withstands temperatures above 1000°C and corrosive chemical environments, ideal for laser, high-temperature furnace and infrared thermal imaging systems where fused silica fails.
Q3: Can you provide sapphire transmission curve test data with orders?
A3: Yes. Every sapphire window batch can be attached with official spectral test reports containing complete wavelength-transmittance curve data, supporting customer optical system verification and project certification.
Q4: What crystal cut is standard for your sapphire windows?
A4: Our standard sapphire windows adopt C-plane (Z-cut) orientation to minimize birefringence, suitable for most polarization-sensitive optical systems. A-cut and M-cut sapphire blanks are available via custom order.
Sapphire Windows
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Address：4655th FANRONG ROAD,HIGH-TECH AREA, CHANG CHUN, 130012，China
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