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Large size Sapphire crystals up to 4” in boule are
available in SIOM. As the hardest of the oxide crystals, Sapphire has
a combination of optical and physical properties that make it the best
choice for a variety of demanding applications, Sapphire maintains its
strength even at high temperatures. It has good thermal properties,
excellent electrical and dielectric properties and is resistant to
chemical attack. These properties encourage the use of Sapphire in
aggressive environments where reliability, optical transmission or
strength are required.
Main
Applications include: UV and IR Optics,
Windows for Temperature and Pressure, Corrosion Resistance, Abrasion
Resistance, Heat sinkers and Thermocouplers, Semiconductor Wafer
Carriers, Electrical Insulators, Thin film Deposition, Transparent
Electronic Substrate, Silicon on Sapphire Wafers, Superconductor
Substrate.
Basic Properties of Sapphire Crystal
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Crystal Structure: |
Hexagonal System |
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Lattice: |
a=4.785A, c=12.991A |
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Density: |
3.98g/cm3 |
|
Transmission Range |
0.15-5.5μm |
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Melting Point: |
2042° C |
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Specific Heat: |
0.418W× s/g/k |
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Thermal Conductivity: |
25.12W/m/k(@100° C) |
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Thermal Shock Resistance: |
790W/m |
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Thermal Expansion Coefficient: |
5.8´ 10-6/K |
|
dn/dt (@633nm) |
13´ 10-6/K |
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Mohs Hardness: |
9 |
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Refractive Index(no): |
1.83(0.26μm), 1.76(0.63μm), 1.58(5.57μm) |
Standard Specifications of Sapphire
Windows & Mirrors
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Diameter: |
+0.0, -0.1mm |
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Thickness: |
+/-0.02mm |
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Flatness: |
better than λ per 10mm (@633nm) |
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Parallelism: |
better than 3’ |
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Perpendicularity: |
better than 5’ |
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Scratch-Dig: |
20-30 per MIL-O-13830A |
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Wavefront Distortion: |
Less than λ /2 per inch (λ@1064nm) |
Other high-precision sapphire widows, AR- or
HR-coatings are available upon request. Sapphire boule grown by CZ
method and as-cut Sapphire blocks are also available. |
