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Sapphire Windows

Sapphire crystal is the hardest oxide crystal, is the basic single crystal form of aluminum oxide (Al2O3). It has a series of excellent physical and chemical characteristics such as high strength, high hardness, high temperature resistance,abrasion resistance, corrosion resistance, good light transmission performance and excellent electrical insulation performance. Therefore, it can be widely used in various demanding fields such as national defense, scientific research, and civil industry.
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Sapphire main features and applications:
1. Wear-resistant, high hardness, corrosion resistance, small friction coefficient, is an ideal material for precision instrument mechanical bearings;
2. Abrasion resistance, high hardness, corrosion resistance, and excellent light transmission performance, so it is also the preferred cover material for advanced watches;
3. High strength, corrosion resistance, high thermal conductivity, high thermal conductivity, high light transmission characteristics and wide light transmission band (from near ultraviolet to 7um mid-infrared band), is an ideal window material and optical component material;
4. Excellent electrical insulation performance, hexagonal symmetrical structure, stable chemical performance, excellent semiconductor and superconducting substrate materials (small leakage capacitance and parasitic capacitance);
5. The lattice constant mismatch rate between the sapphire C-plane and the III-Ⅴ and II-Ⅵ group deposited films is small (the mismatch rate with GaN is less than 4%), so it is currently the most important GaN blue LED and LD Epitaxial substrate material.

Highly recommended Sapphire Items from Yutai Optics:
Sapphire windows,
Sapphire Step Glass,  
Sapphire Windows with Holes,
Sapphire Windows with Groove,
2/4/6/8" Sapphire Wafers.

Transmittance of Sapphire:

Diameter Tolerance :+/-0.15 mm
Thickness Tolerance :+/-0.1mm 
Parallelism <3 arc minutes
Surface Quality :60-40
Surface Figure:λ/10@633nm 
Bevel:0.25mm×45 ° 
Clear Aperture:90% 
Coating:Specified by customers 
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